def raster_to_file(self, layer, filename):
'''
write the contents of the raster-layer to a file (tif)
'''
extent = layer.extent()
width, height = layer.width(), layer.height()
pipe = QgsRasterPipe()
# setting renderer leads to export as rendered image (strange: causes conversion from grayscale to multicolor with 4 bands)
# else raw data is written (in grayscale)
#renderer = layer.renderer()
provider = layer.dataProvider()
#pipe.set(renderer.clone())
pipe.set(provider.clone())
# another possible way to pipe (take the referenced one), references the renderer as well
# -> causes wrong color bands while exporting (see some lines above)
#pipe = layer.pipe()
file_writer = QgsRasterFileWriter(filename)
file_writer.writeRaster(pipe,
width,
height,
extent,
layer.crs())
def clip_raster(raster, column_count, row_count, output_extent):
"""Clip raster to specified extent, width and height.
Note there is similar utility in safe_qgis.utilities.clipper, but it uses
gdal whereas this one uses native QGIS.
:param raster: Raster
:type raster: QgsRasterLayer
:param column_count: Desired width in pixels of new raster
:type column_count: Int
:param row_count: Desired height in pixels of new raster
:type row_count: Int
:param output_extent: Extent of the clipped region
:type output_extent: QgsRectangle
:returns: Clipped region of the raster
:rtype: QgsRasterLayer
"""
provider = raster.dataProvider()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
base_name = unique_filename()
file_name = base_name + ".tif"
file_writer = QgsRasterFileWriter(file_name)
file_writer.writeRaster(pipe, column_count, row_count, output_extent, raster.crs())
return QgsRasterLayer(file_name, "clipped_raster")
def _add_raster_layer(self, raster_layer, layer_name, save_style=False):
"""Add a raster layer to the folder.
:param raster_layer: The layer to add.
:type raster_layer: QgsRasterLayer
:param layer_name: The name of the layer in the datastore.
:type layer_name: str
:param save_style: If we have to save a QML too. Default to False.
:type save_style: bool
:returns: A two-tuple. The first element will be True if we could add
the layer to the datastore. The second element will be the layer
name which has been used or the error message.
:rtype: (bool, str)
.. versionadded:: 4.0
"""
if not self.is_writable():
return False, 'The destination is not writable.'
output = QFileInfo(self.uri.filePath(layer_name + '.tif'))
source = QFileInfo(raster_layer.source())
if source.exists() and source.suffix() in ['tiff', 'tif']:
# If it's tiff file based.
QFile.copy(source.absoluteFilePath(), output.absoluteFilePath())
else:
# If it's not file based.
renderer = raster_layer.renderer()
provider = raster_layer.dataProvider()
crs = raster_layer.crs()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
pipe.set(renderer.clone())
file_writer = QgsRasterFileWriter(output.absoluteFilePath())
file_writer.Mode(1)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
crs)
del file_writer
if save_style:
style_path = QFileInfo(self.uri.filePath(layer_name + '.qml'))
raster_layer.saveNamedStyle(style_path.absoluteFilePath())
assert output.exists()
return True, output.baseName()
def run_raster_upload(self):
# The selected layer should be a raster layer.
layer = self.iface.activeLayer()
if not isinstance(layer, QgsRasterLayer):
pop_up_info("Error: you must select the raster layer")
return
fd, tiff_filename = tempfile.mkstemp(suffix='.tiff')
os.close(fd)
# ^^^ We just want the filename, not the opened file descriptor.
provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
file_writer = QgsRasterFileWriter(tiff_filename)
file_writer.writeRaster(pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
# http://build-failed.blogspot.nl/2014/12/splitting-vector-and-raster-files-in.html
# print(tiff_filename)
# Optionally TODO: grab title from dialog.
title = "Uploaded by the qgis plugin on %s" % (
datetime.datetime.now().isoformat())
form = urllib2_upload.MultiPartForm()
form.add_field('title', title)
form.add_field('organisation_id', str(self.selected_organisation))
filename = os.path.basename(tiff_filename)
form.add_file('raster_file', filename, fileHandle=open(tiff_filename, 'rb'))
request = urllib2.Request('https://ggmn.un-igrac.org/upload_raster/')
request.add_header('User-agent', 'qgis ggmn uploader')
request.add_header('username', self.username)
request.add_header('password', self.password)
body = str(form)
request.add_header('Content-type', form.get_content_type())
request.add_header('Content-length', len(body))
# print("content-length: %s" % len(body))
request.add_data(body)
fd2, logfile = tempfile.mkstemp(prefix="uploadlog", suffix=".txt")
open(logfile, 'w').write(request.get_data())
# print("Printed what we'll send to %s" % logfile)
answer = urllib2.urlopen(request).read()
# print(answer)
# print("Uploaded geotiff to the server")
pop_up_info("Uploaded geotiff to the server")
def read_from_qgis_native(self, qgis_layer):
"""Read raster data from qgis layer QgsRasterLayer.
A stub is used now:
save all data in a file,
then call safe.read_from_file
Raises:
* TypeError if qgis is not avialable
* IOError if can't store temporary file
* GetDataError if can't create copy of qgis_layer's
dataProvider
"""
base_name = unique_filename()
file_name = base_name + '.tif'
file_writer = QgsRasterFileWriter(file_name)
pipe = QgsRasterPipe()
provider = qgis_layer.dataProvider()
if not pipe.set(provider.clone()):
msg = "Cannot set pipe provider"
raise GetDataError(msg)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
# Write keywords if any
write_keywords(self.keywords, base_name + '.keywords')
self.read_from_file(file_name)
def testImportIntoGpkg(self):
# init target file
test_gpkg = tempfile.mktemp(suffix='.gpkg', dir=self.testDataDir)
gdal.GetDriverByName('GPKG').Create(test_gpkg, 1, 1, 1)
source = QgsRasterLayer(os.path.join(self.testDataDir, 'raster', 'band3_byte_noct_epsg4326.tif'), 'my', 'gdal')
self.assertTrue(source.isValid())
provider = source.dataProvider()
fw = QgsRasterFileWriter(test_gpkg)
fw.setOutputFormat('gpkg')
fw.setCreateOptions(['RASTER_TABLE=imported_table', 'APPEND_SUBDATASET=YES'])
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(provider.clone()))
projector = QgsRasterProjector()
projector.setCrs(provider.crs(), provider.crs())
self.assertTrue(pipe.insert(2, projector))
self.assertEqual(fw.writeRaster(pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs()), 0)
# Check that the test geopackage contains the raster layer and compare
rlayer = QgsRasterLayer('GPKG:%s:imported_table' % test_gpkg)
self.assertTrue(rlayer.isValid())
out_provider = rlayer.dataProvider()
self.assertEqual(provider.block(1, provider.extent(), source.width(), source.height()).data(),
out_provider.block(1, out_provider.extent(), rlayer.width(), rlayer.height()).data())
# remove result file
os.unlink(test_gpkg)
def testLayerRemovalBeforeRun(self):
"""test behavior when layer is removed before task begins"""
path = os.path.join(unitTestDataPath(), 'raster', 'with_color_table.tif')
raster_layer = QgsRasterLayer(path, "test")
self.assertTrue(raster_layer.isValid())
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(raster_layer.dataProvider().clone()))
tmp = create_temp_filename('remove_layer.tif')
writer = QgsRasterFileWriter(tmp)
task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs())
task.writeComplete.connect(self.onSuccess)
task.errorOccurred.connect(self.onFail)
# remove layer
raster_layer = None
QgsApplication.taskManager().addTask(task)
while not self.success and not self.fail:
QCoreApplication.processEvents()
# in this case will still get a positive result - since the pipe is cloned before the task
# begins the task is no longer dependent on the original layer
self.assertTrue(self.success)
self.assertFalse(self.fail)
self.assertTrue(os.path.exists(tmp))
def extractRasterLayer(self, tempDir):
"""Extract the raster from the current layer to a temporary GeoTiff file.
Extracts a geotiff file that can be uploaded to maps engine. This approach
ensures that we are able to upload any layer that QGIS has ability to read.
Args:
tempDir: str, path of directory where to extract the shapefile.
Returns:
a dictionary with file names as keys and file path as values.
"""
layerName = unicode(self.lineEditLayerName.text())
tempTifPath = os.path.join(tempDir, layerName + '.tif')
currentLayer = self.iface.mapCanvas().currentLayer()
self.iface.messageBar().pushMessage(
'Google Maps Engine Connector',
'Extracting data to a temporary geotiff file. Please wait...',
level=QgsMessageBar.INFO)
QCoreApplication.processEvents()
pipe = QgsRasterPipe()
provider = currentLayer.dataProvider()
pipe.set(provider.clone())
rasterWriter = QgsRasterFileWriter(tempTifPath)
xSize = provider.xSize()
ySize = provider.ySize()
if xSize and ySize:
error = rasterWriter.writeRaster(
pipe, xSize, ySize, provider.extent(), provider.crs())
if error != QgsRasterFileWriter.NoError:
QgsMessageLog.logMessage(error, 'GMEConnector',
QgsMessageLog.CRITICAL)
return
else:
return
filesToUpload = {}
fileName = layerName + '.tif'
filePath = os.path.join(tempDir, fileName)
filesToUpload[fileName] = filePath
return filesToUpload
def polygonize_gdal(
raster,
threshold_min=0.0,
threshold_max=float('inf')):
"""
Function to polygonize raster. Areas (pixels) with threshold_min <
pixel_values < threshold_max will be converted to polygons.
:param raster: Raster layer
:type raster: QgsRasterLayer
:param threshold_min: Value that splits raster to flooded or not flooded.
:type threshold_min: float
:param threshold_max: Value that splits raster to flooded or not flooded.
:type threshold_max: float
:returns: Polygonal geometry
:rtype: QgsGeometry
"""
# save qgis raster to disk
base_name = unique_filename()
file_name = base_name + '.tif'
file_writer = QgsRasterFileWriter(file_name)
pipe = QgsRasterPipe()
provider = raster.dataProvider()
if not pipe.set(provider.clone()):
msg = "Cannot set pipe provider"
raise GetDataError(msg)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
(
inside_file_name,
inside_layer_name,
outside_file_name,
outside_layer_name
) = polygonize_thresholds(file_name, threshold_min, threshold_max)
inside_layer = \
QgsVectorLayer(inside_file_name, inside_layer_name, 'ogr')
outside_layer = \
QgsVectorLayer(outside_file_name, outside_layer_name, 'ogr')
if inside_layer.featureCount() == 0:
return None, None
else:
return inside_layer, outside_layer
def exportRasterLayer(self, layer, destinationFile, options=None):
outputFormat = self.settings['rasterFormat'] if 'rasterFormat' in self.settings else 'GTiff'
if os.path.splitext(destinationFile)[1] == '':
formats = QgsRasterFileWriter.extensionsForFormat(outputFormat)
if len(formats) > 0:
destinationFile = '{}.{}'.format(destinationFile, formats[0])
provider = layer.dataProvider()
cols = provider.xSize()
rows = provider.ySize()
if not provider.capabilities() & QgsRasterDataProvider.Size:
k = float(provider.extent().width()) / float(provider.extent().height())
cols = RASTER_SIZE * k
rows = RASTER_SIZE
pipe = QgsRasterPipe()
if not pipe.set(provider.clone()):
QgsMessageLog.logMessage(self.tr('Failed to export layer "{layer}": Cannot set pipe provider.'.format(layer=layer.name())), 'QConsolidate', Qgis.Warning)
return False, None
nodata = {}
for i in range(1, provider.bandCount() + 1):
if provider.sourceHasNoDataValue(i):
value = provider.sourceNoDataValue(i)
nodata[i] = QgsRasterRange(value, value)
nuller = QgsRasterNuller()
for band, value in nodata.items():
nuller.setNoData(band, [value])
if not pipe.insert(1, nuller):
QgsMessageLog.logMessage(self.tr('Failed to export layer "{layer}": Cannot set pipe nuller.'.format(layer=layer.name())), 'QConsolidate', Qgis.Warning)
return False, None
writer = QgsRasterFileWriter(destinationFile)
writer.setOutputFormat(outputFormat)
if options is not None:
writer.setCreateOptions(options)
success = True
error = writer.writeRaster(pipe, cols, rows, provider.extent(), provider.crs())
if error != QgsRasterFileWriter.NoError:
QgsMessageLog.logMessage(self.tr('Failed to export layer "{layer}": {message}.'.format(layer=layer.name(), message=error)), 'QConsolidate', Qgis.Warning)
success = False
return success, destinationFile
def test02_SaveAsGeoTIFF(self):
"""Save raster layer as a GeoTIFF file"""
self._testAvailable() or self.skipTest("Not available")
layer = self._testLayer(self.fileName)
# write to a disk
# ref. to the InaSAFE plugin
provider = layer.dataProvider()
pipe = QgsRasterPipe()
assert pipe.set(provider.clone()), "cannot set provider to pipe"
outfile = self._testDataPath(self.fileName, output=True)
writer = QgsRasterFileWriter(outfile)
assert not writer.writeRaster(pipe, provider.xSize(), provider.ySize(), provider.extent(), provider.crs()), "failed to write"
assert os.path.exists(outfile), "output file cannot be found"
def write(self, theRasterName):
print theRasterName
path = "%s/%s" % (self.testDataDir, theRasterName)
# myFileInfo = QFileInfo( path )
# myBaseName = myFileInfo.baseName()
rasterLayer = QgsRasterLayer(path, "test")
if not rasterLayer.isValid():
return False
provider = rasterLayer.dataProvider()
tmpFile = QTemporaryFile()
tmpFile.open() # fileName is no avialable until open
tmpName = tmpFile.fileName()
tmpFile.close()
# do not remove when class is destroyd so that we can read the file and see difference
tmpFile.setAutoRemove(False)
fileWriter = QgsRasterFileWriter(tmpName)
pipe = QgsRasterPipe()
if not pipe.set(provider.clone()):
print "Cannot set pipe provider"
return False
# nuller = QgsRasterNuller()
# nuller.setNoData( ... )
# if not pipe.insert( 1, nuller ):
# print "Cannot set pipe nuller"
# return False
projector = QgsRasterProjector()
projector.setCRS(provider.crs(), provider.crs())
if not pipe.insert(2, projector):
print "Cannot set pipe projector"
return False
fileWriter.writeRaster(pipe, provider.xSize(), provider.ySize(), provider.extent(), provider.crs())
checker = QgsRasterChecker()
ok = checker.runTest("gdal", tmpName, "gdal", path)
self.report += checker.report()
# All OK, we can delete the file
tmpFile.setAutoRemove(ok)
return ok
def write(self, theRasterName):
print(theRasterName)
path = "%s/%s" % (self.testDataDir, theRasterName)
rasterLayer = QgsRasterLayer(path, "test")
if not rasterLayer.isValid():
return False
provider = rasterLayer.dataProvider()
tmpFile = QTemporaryFile()
tmpFile.open() # fileName is no avialable until open
tmpName = tmpFile.fileName()
tmpFile.close()
# do not remove when class is destroyed so that we can read
# the file and see difference
tmpFile.setAutoRemove(False)
fileWriter = QgsRasterFileWriter(tmpName)
pipe = QgsRasterPipe()
if not pipe.set(provider.clone()):
print("Cannot set pipe provider")
return False
projector = QgsRasterProjector()
projector.setCrs(provider.crs(), provider.crs())
if not pipe.insert(2, projector):
print("Cannot set pipe projector")
return False
fileWriter.writeRaster(pipe, provider.xSize(), provider.ySize(),
provider.extent(), provider.crs())
checker = QgsRasterChecker()
ok = checker.runTest("gdal", tmpName, "gdal", path)
self.report += checker.report()
# All OK, we can delete the file
tmpFile.setAutoRemove(ok)
return ok
def testExportToGpkgWithExtraExtent(self):
tmpName = tempfile.mktemp(suffix='.gpkg')
source = QgsRasterLayer(
os.path.join(self.testDataDir, 'raster',
'band3_byte_noct_epsg4326.tif'), 'my', 'gdal')
self.assertTrue(source.isValid())
provider = source.dataProvider()
fw = QgsRasterFileWriter(tmpName)
fw.setOutputFormat('gpkg')
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(provider.clone()))
self.assertEqual(
fw.writeRaster(pipe,
provider.xSize() + 4,
provider.ySize() + 4,
QgsRectangle(-3 - 2, -4 - 2, 7 + 2, 6 + 2),
provider.crs()), 0)
del fw
# Check that the test geopackage contains the raster layer and compare
rlayer = QgsRasterLayer(tmpName)
self.assertTrue(rlayer.isValid())
out_provider = rlayer.dataProvider()
for i in range(3):
src_data = provider.block(i + 1, provider.extent(), source.width(),
source.height())
out_data = out_provider.block(i + 1, provider.extent(),
source.width(), source.height())
self.assertEqual(src_data.data(), out_data.data())
out_data = out_provider.block(1, QgsRectangle(7, -4, 7 + 2, 6), 2, 8)
# band3_byte_noct_epsg4326 nodata is 255
self.assertEqual(out_data.data().data(), b'\xff' * 2 * 8)
del out_provider
del rlayer
# remove result file
os.unlink(tmpName)
def read_from_qgis_native(self, qgis_layer):
"""Read raster data from qgis layer QgsRasterLayer.
A stub is used now:
save all data in a file,
then call safe.read_from_file
Raises:
* TypeError if qgis is not avialable
* IOError if can't store temporary file
* GetDataError if can't create copy of qgis_layer's
dataProvider
"""
if not qgis_imported: # FIXME (DK): this branch isn't covered by test
msg = ('Used data is QgsRasterLayer instance, '
'but QGIS is not available.')
raise TypeError(msg)
base_name = unique_filename()
file_name = base_name + '.tif'
file_writer = QgsRasterFileWriter(file_name)
pipe = QgsRasterPipe()
provider = qgis_layer.dataProvider()
if not pipe.set(provider.clone()):
msg = "Cannot set pipe provider"
raise GetDataError(msg)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
# Write keywords if any
write_keywords(self.keywords, base_name + '.keywords')
self.read_from_file(file_name)
def testFail(self):
"""test error writing a layer"""
path = os.path.join(unitTestDataPath(), 'raster', 'with_color_table.tif')
raster_layer = QgsRasterLayer(path, "test")
self.assertTrue(raster_layer.isValid())
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(raster_layer.dataProvider().clone()))
tmp = create_temp_filename("/this/is/invalid/file.tif")
writer = QgsRasterFileWriter(tmp)
task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs(), QgsCoordinateTransformContext())
task.writeComplete.connect(self.onSuccess)
task.errorOccurred.connect(self.onFail)
QgsApplication.taskManager().addTask(task)
while not self.success and not self.fail:
QCoreApplication.processEvents()
self.assertFalse(self.success)
self.assertTrue(self.fail)
def testImportIntoGpkg(self):
# init target file
test_gpkg = tempfile.mktemp(suffix='.gpkg', dir=self.testDataDir)
gdal.GetDriverByName('GPKG').Create(test_gpkg, 1, 1, 1)
source = QgsRasterLayer(
os.path.join(self.testDataDir, 'raster',
'band3_byte_noct_epsg4326.tif'), 'my', 'gdal')
self.assertTrue(source.isValid())
provider = source.dataProvider()
fw = QgsRasterFileWriter(test_gpkg)
fw.setOutputFormat('gpkg')
fw.setCreateOptions(
['RASTER_TABLE=imported_table', 'APPEND_SUBDATASET=YES'])
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(provider.clone()))
projector = QgsRasterProjector()
projector.setCrs(provider.crs(), provider.crs())
self.assertTrue(pipe.insert(2, projector))
self.assertEqual(
fw.writeRaster(pipe, provider.xSize(), provider.ySize(),
provider.extent(), provider.crs()), 0)
# Check that the test geopackage contains the raster layer and compare
rlayer = QgsRasterLayer('GPKG:%s:imported_table' % test_gpkg)
self.assertTrue(rlayer.isValid())
out_provider = rlayer.dataProvider()
self.assertEqual(
provider.block(1, provider.extent(), source.width(),
source.height()).data(),
out_provider.block(1, out_provider.extent(), rlayer.width(),
rlayer.height()).data())
# remove result file
os.unlink(test_gpkg)
def _testGeneratePyramids(self, pyramidFormat):
tmpName = tempfile.mktemp(suffix='.tif')
source = QgsRasterLayer(os.path.join(self.testDataDir, 'raster', 'byte.tif'), 'my', 'gdal')
self.assertTrue(source.isValid())
provider = source.dataProvider()
fw = QgsRasterFileWriter(tmpName)
fw.setBuildPyramidsFlag(QgsRaster.PyramidsFlagYes)
fw.setPyramidsFormat(pyramidFormat)
fw.setPyramidsList([2])
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(provider.clone()))
projector = QgsRasterProjector()
projector.setCrs(provider.crs(), provider.crs())
self.assertTrue(pipe.insert(2, projector))
self.assertEqual(fw.writeRaster(pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs()), 0)
del fw
ds = gdal.Open(tmpName)
self.assertEqual(ds.GetRasterBand(1).GetOverviewCount(), 1)
fl = ds.GetFileList()
if pyramidFormat == QgsRaster.PyramidsGTiff:
self.assertEqual(len(fl), 2, fl)
self.assertIn('.ovr', fl[1])
elif pyramidFormat == QgsRaster.PyramidsInternal:
self.assertEqual(len(fl), 1, fl)
elif pyramidFormat == QgsRaster.PyramidsErdas:
self.assertEqual(len(fl), 2, fl)
self.assertIn('.aux', fl[1])
os.unlink(tmpName)
def testSuccess(self):
"""test successfully writing a layer"""
path = os.path.join(unitTestDataPath(), 'raster', 'with_color_table.tif')
raster_layer = QgsRasterLayer(path, "test")
self.assertTrue(raster_layer.isValid())
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(raster_layer.dataProvider().clone()))
tmp = create_temp_filename('success.tif')
writer = QgsRasterFileWriter(tmp)
task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs())
task.writeComplete.connect(self.onSuccess)
task.errorOccurred.connect(self.onFail)
QgsApplication.taskManager().addTask(task)
while not self.success and not self.fail:
QCoreApplication.processEvents()
self.assertTrue(self.success)
self.assertFalse(self.fail)
self.assertTrue(os.path.exists(tmp))
def testWriteAsRawGS7BG(self):
''' Test that despite writing a Byte raster, we correctly handle GS7BG creating a Float64 '''
tmpName = tempfile.mktemp(suffix='.grd')
source = QgsRasterLayer(os.path.join(self.testDataDir, 'raster', 'byte.tif'), 'my', 'gdal')
self.assertTrue(source.isValid())
provider = source.dataProvider()
fw = QgsRasterFileWriter(tmpName)
fw.setOutputFormat('GS7BG')
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(provider.clone()))
self.assertEqual(fw.writeRaster(pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs()), QgsRasterFileWriter.NoError)
del fw
ds = gdal.Open(tmpName)
self.assertEqual(ds.RasterCount, 1)
self.assertEqual(ds.GetRasterBand(1).Checksum(), 4672)
ds = None
os.unlink(tmpName)
def write_raster(raster_layer, raster_writer, write_path):
"""Write raster to specified file and update the layer's data source."""
dp = raster_layer.dataProvider()
pipe = QgsRasterPipe()
if not pipe.set(dp.clone()):
raise PackagingError(
f"Couldn't set raster pipe projector for layer {write_path}")
projector = QgsRasterProjector()
projector.setCrs(raster_layer.crs(), raster_layer.crs())
if not pipe.insert(2, projector):
raise PackagingError(
f"Couldn't set raster pipe provider for layer {write_path}")
res = raster_writer.writeRaster(pipe, dp.xSize(), dp.ySize(), dp.extent(),
raster_layer.crs())
if not res == QgsRasterFileWriter.NoError:
raise PackagingError(
f"Couldn't save raster {write_path} - write error: {res}")
provider_opts = QgsDataProvider.ProviderOptions()
provider_opts.layerName = raster_layer.name()
raster_layer.setDataSource(write_path, raster_layer.name(), "gdal",
provider_opts)
def _testGeneratePyramids(self, pyramidFormat):
tmpName = tempfile.mktemp(suffix='.tif')
source = QgsRasterLayer(os.path.join(self.testDataDir, 'raster', 'byte.tif'), 'my', 'gdal')
self.assertTrue(source.isValid())
provider = source.dataProvider()
fw = QgsRasterFileWriter(tmpName)
fw.setBuildPyramidsFlag(QgsRaster.PyramidsFlagYes)
fw.setPyramidsFormat(pyramidFormat)
fw.setPyramidsList([2])
pipe = QgsRasterPipe()
self.assertTrue(pipe.set(provider.clone()))
projector = QgsRasterProjector()
projector.setCrs(provider.crs(), provider.crs())
self.assertTrue(pipe.insert(2, projector))
self.assertEqual(fw.writeRaster(pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs()), 0)
del fw
ds = gdal.Open(tmpName)
self.assertEqual(ds.GetRasterBand(1).GetOverviewCount(), 1)
fl = ds.GetFileList()
if pyramidFormat == QgsRaster.PyramidsGTiff:
self.assertEqual(len(fl), 2, fl)
self.assertIn('.ovr', fl[1])
elif pyramidFormat == QgsRaster.PyramidsInternal:
self.assertEqual(len(fl), 1, fl)
elif pyramidFormat == QgsRaster.PyramidsErdas:
self.assertEqual(len(fl), 2, fl)
self.assertIn('.aux', fl[1])
os.unlink(tmpName)
def exportRaster(layer, count, layersFolder, feedback, iface, matchCRS):
feedback.showFeedback("Exporting %s to PNG..." % layer.name())
name_ts = (safeName(layer.name()) + unicode(count) +
unicode(int(time.time())))
# We need to create a new file to export style
piped_file = os.path.join(tempfile.gettempdir(), name_ts + '_piped.tif')
piped_extent = layer.extent()
piped_width = layer.height()
piped_height = layer.width()
piped_crs = layer.crs()
piped_renderer = layer.renderer()
piped_provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(piped_provider.clone())
pipe.set(piped_renderer.clone())
file_writer = QgsRasterFileWriter(piped_file)
file_writer.writeRaster(pipe, piped_height, -1, piped_extent, piped_crs)
# Export layer as PNG
out_raster = os.path.join(layersFolder, safeName(layer.name()) + "_" +
unicode(count) + ".png")
projectCRS = iface.mapCanvas().mapSettings().destinationCrs()
if not (matchCRS and layer.crs() == projectCRS):
# Extent of the layer in EPSG:3857
crsSrc = layer.crs()
crsDest = QgsCoordinateReferenceSystem(3857)
try:
xform = QgsCoordinateTransform(crsSrc, crsDest,
QgsProject.instance())
except:
xform = QgsCoordinateTransform(crsSrc, crsDest)
extentRep = xform.transformBoundingBox(layer.extent())
extentRepNew = ','.join([unicode(extentRep.xMinimum()),
unicode(extentRep.xMaximum()),
unicode(extentRep.yMinimum()),
unicode(extentRep.yMaximum())])
# Reproject in 3857
piped_3857 = os.path.join(tempfile.gettempdir(),
name_ts + '_piped_3857.tif')
qgis_version = Qgis.QGIS_VERSION
old_stdout = sys.stdout
sys.stdout = mystdout = StringIO()
try:
processing.algorithmHelp("gdal:warpreproject")
except:
pass
sys.stdout = old_stdout
params = {
"INPUT": piped_file,
"SOURCE_CRS": layer.crs().authid(),
"TARGET_CRS": "EPSG:3857",
"NODATA": 0,
"TARGET_RESOLUTION": 0,
"RESAMPLING": 2,
"TARGET_EXTENT": extentRepNew,
"EXT_CRS": "EPSG:3857",
"TARGET_EXTENT_CRS": "EPSG:3857",
"DATA_TYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"MULTITHREADING": False,
"COPY_SUBDATASETS": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
warpArgs = {}
lines = mystdout.getvalue()
for count, line in enumerate(lines.split("\n")):
if count != 0 and ":" in line:
try:
k = line.split(":")[0]
warpArgs[k] = params[k]
except:
pass
try:
processing.run("gdal:warpreproject", warpArgs)
except:
shutil.copyfile(piped_file, piped_3857)
try:
processing.run("gdal:translate", {"INPUT": piped_3857,
"OUTSIZE": 100,
"OUTSIZE_PERC": True,
"NODATA": 0,
"EXPAND": 0,
"TARGET_CRS": "",
"PROJWIN": extentRepNew,
"SDS": False,
"DATA_TYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"COPY_SUBDATASETS": False,
"OPTIONS": "",
"OUTPUT": out_raster})
except:
shutil.copyfile(piped_3857, out_raster)
else:
srcExtent = ','.join([unicode(piped_extent.xMinimum()),
unicode(piped_extent.xMaximum()),
unicode(piped_extent.yMinimum()),
unicode(piped_extent.yMaximum())])
processing.run("gdal:translate", {"INPUT": piped_file,
"OUTSIZE": 100,
"OUTSIZE_PERC": True,
"NODATA": 0,
"EXPAND": 0,
"TARGET_CRS": "",
"PROJWIN": srcExtent,
"SDS": False,
"DATA_TYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"COPY_SUBDATASETS": False,
"OPTIONS": "",
"OUTPUT": out_raster})
def styleRaster(filename):
# Create outfile name
outfile = "".join(filename.strip().split('.raw'))
# Open layer from filename
rasterfile = filename.strip().split('/')[-1]
rasterlayer = rasterfile.split('.')[0]
rlayer = QgsRasterLayer(filename, rasterlayer, 'gdal')
# Check if layer is valid
if rlayer.isValid() is True:
# Get layer data provider
provider = rlayer.dataProvider()
# Calculate histrogram
provider.initHistogram(QgsRasterHistogram(), 1, 100)
hist = provider.histogram(1)
# Get histograms stats
nbins = hist.binCount
minv = hist.minimum
maxv = hist.maximum
# Create histogram array, bin array, and histogram index
hista = np.array(hist.histogramVector)
bins = np.arange(minv, maxv, (maxv - minv) / nbins)
index = np.where(hista > 5)
# Get bottom and top color values from bin values
bottomcolor = bins[index[0][0]]
topcolor = bins[index[0][-1]]
# Calculate range value between the bottom and top color values
if bottomcolor < 0:
vrange = topcolor + bottomcolor
else:
vrange = topcolor - bottomcolor
# Calculate values for bottom middle, and top middle color values
if rasterlayer == 'maxele':
bottommiddle = vrange * 0.3333
topmiddle = vrange * 0.6667
else:
bottommiddle = vrange * 0.375
topmiddle = vrange * 0.75
# Create list of color values
valueList = [bottomcolor, bottommiddle, topmiddle, topcolor]
# Create color dictionary
if rasterlayer == 'maxele':
colDic = {
'bottomcolor': '#0000ff',
'bottommiddle': '#00ffff',
'topmiddle': '#ffff00',
'topcolor': '#ff0000'
}
else:
colDic = {
'bottomcolor': '#000000',
'bottommiddle': '#ff0000',
'topmiddle': '#ffff00',
'topcolor': '#ffffff'
}
# Create color ramp function and add colors
fnc = QgsColorRampShader()
fnc.setColorRampType(QgsColorRampShader.Interpolated)
lst = [QgsColorRampShader.ColorRampItem(valueList[0], QColor(colDic['bottomcolor'])),\
QgsColorRampShader.ColorRampItem(valueList[1], QColor(colDic['bottommiddle'])), \
QgsColorRampShader.ColorRampItem(valueList[2], QColor(colDic['topmiddle'])), \
QgsColorRampShader.ColorRampItem(valueList[3], QColor(colDic['topcolor']))]
fnc.setColorRampItemList(lst)
# Create raster shader and add color ramp function
shader = QgsRasterShader()
shader.setRasterShaderFunction(fnc)
# Create color render and set opacity
renderer = QgsSingleBandPseudoColorRenderer(provider, 1, shader)
renderer.setOpacity(0.75)
# Get output format
output_format = QgsRasterFileWriter.driverForExtension(
os.path.splitext(outfile)[1])
# Open output file for writing
rfw = QgsRasterFileWriter(outfile)
rfw.setOutputProviderKey('gdal')
rfw.setOutputFormat(output_format)
# Add EPSG 4326 to layer crs
crs = QgsCoordinateReferenceSystem()
crs.createFromSrid(4326)
# Create Raster pipe and set provider and renderer
pipe = QgsRasterPipe()
pipe.set(provider.clone())
pipe.set(renderer.clone())
# Get transform context
transform_context = QgsProject.instance().transformContext()
# Write to file
rfw.writeRaster(pipe, provider.xSize(), provider.ySize(),
provider.extent(), crs, transform_context)
logger.info(
'Conveted data in ' + rasterfile +
' from float64 to 8bit, added color palette and saved to tiff (' +
outfile.split('/')[-1] + ') file')
if not rlayer.isValid():
raise Exception('Invalid raster')
return (valueList)
def exportLayers(iface, layers, folder, precision, optimize, popupField, json,
restrictToExtent, extent, feedback):
canvas = iface.mapCanvas()
epsg4326 = QgsCoordinateReferenceSystem("EPSG:4326")
layersFolder = os.path.join(folder, "layers")
QDir().mkpath(layersFolder)
for count, (layer, encode2json,
popup) in enumerate(zip(layers, json, popupField)):
if (layer.type() == layer.VectorLayer
and (layer.providerType() != "WFS" or encode2json)):
feedback.showFeedback("Exporting %s to JSON..." % layer.name())
cleanLayer = writeTmpLayer(layer, popup, restrictToExtent, iface,
extent)
fields = layer.pendingFields()
for field in fields:
exportImages(layer, field.name(), layersFolder + "/tmp.tmp")
if is25d(layer, canvas, restrictToExtent, extent):
provider = cleanLayer.dataProvider()
provider.addAttributes([
QgsField("height", QVariant.Double),
QgsField("wallColor", QVariant.String),
QgsField("roofColor", QVariant.String)
])
cleanLayer.updateFields()
fields = cleanLayer.pendingFields()
renderer = layer.rendererV2()
renderContext = QgsRenderContext.fromMapSettings(
canvas.mapSettings())
feats = layer.getFeatures()
context = QgsExpressionContext()
context.appendScope(
QgsExpressionContextUtils.layerScope(layer))
expression = QgsExpression('eval(@qgis_25d_height)')
heightField = fields.indexFromName("height")
wallField = fields.indexFromName("wallColor")
roofField = fields.indexFromName("roofColor")
renderer.startRender(renderContext, fields)
cleanLayer.startEditing()
for feat in feats:
context.setFeature(feat)
height = expression.evaluate(context)
if isinstance(renderer, QgsCategorizedSymbolRendererV2):
classAttribute = renderer.classAttribute()
attrValue = feat.attribute(classAttribute)
catIndex = renderer.categoryIndexForValue(attrValue)
categories = renderer.categories()
symbol = categories[catIndex].symbol()
elif isinstance(renderer, QgsGraduatedSymbolRendererV2):
classAttribute = renderer.classAttribute()
attrValue = feat.attribute(classAttribute)
ranges = renderer.ranges()
for range in ranges:
if (attrValue >= range.lowerValue()
and attrValue <= range.upperValue()):
symbol = range.symbol().clone()
else:
symbol = renderer.symbolForFeature2(
feat, renderContext)
sl1 = symbol.symbolLayer(1)
sl2 = symbol.symbolLayer(2)
wallColor = sl1.subSymbol().color().name()
roofColor = sl2.subSymbol().color().name()
provider.changeAttributeValues({
feat.id() + 1: {
heightField: height,
wallField: wallColor,
roofField: roofColor
}
})
cleanLayer.commitChanges()
renderer.stopRender(renderContext)
sln = safeName(cleanLayer.name()) + unicode(count)
tmpPath = os.path.join(layersFolder, sln + ".json")
path = os.path.join(layersFolder, sln + ".js")
options = []
if precision != "maintain":
options.append("COORDINATE_PRECISION=" + unicode(precision))
QgsVectorFileWriter.writeAsVectorFormat(cleanLayer,
tmpPath,
"utf-8",
epsg4326,
'GeoJson',
0,
layerOptions=options)
with open(path, "w") as f:
f.write("var %s = " % ("geojson_" + sln))
with open(tmpPath, "r") as f2:
for line in f2:
if optimize:
line = line.strip("\n\t ")
line = removeSpaces(line)
f.write(line)
os.remove(tmpPath)
elif (layer.type() == layer.RasterLayer
and layer.providerType() != "wms"):
feedback.showFeedback("Exporting %s to PNG..." % layer.name())
name_ts = (safeName(layer.name()) + unicode(count) +
unicode(int(time.time())))
# We need to create a new file to export style
piped_file = os.path.join(tempfile.gettempdir(),
name_ts + '_piped.tif')
piped_extent = layer.extent()
piped_width = layer.height()
piped_height = layer.width()
piped_crs = layer.crs()
piped_renderer = layer.renderer()
piped_provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(piped_provider.clone())
pipe.set(piped_renderer.clone())
file_writer = QgsRasterFileWriter(piped_file)
file_writer.writeRaster(pipe, piped_width, piped_height,
piped_extent, piped_crs)
# Extent of the layer in EPSG:3857
crsSrc = layer.crs()
crsDest = QgsCoordinateReferenceSystem(3857)
xform = QgsCoordinateTransform(crsSrc, crsDest)
extentRep = xform.transform(layer.extent())
extentRepNew = ','.join([
unicode(extentRep.xMinimum()),
unicode(extentRep.xMaximum()),
unicode(extentRep.yMinimum()),
unicode(extentRep.yMaximum())
])
# Reproject in 3857
piped_3857 = os.path.join(tempfile.gettempdir(),
name_ts + '_piped_3857.tif')
# Export layer as PNG
out_raster = os.path.join(
layersFolder,
safeName(layer.name()) + unicode(count) + ".png")
qgis_version = QGis.QGIS_VERSION
if int(qgis_version.split('.')[1]) < 15:
processing.runalg("gdalogr:warpreproject", piped_file,
layer.crs().authid(), "EPSG:3857", "", 0, 1,
0, -1, 75, 6, 1, False, 0, False, "",
piped_3857)
processing.runalg("gdalogr:translate", piped_3857, 100, True,
"", 0, "", extentRepNew, False, 0, 0, 75, 6,
1, False, 0, False, "", out_raster)
else:
try:
warpArgs = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RAST_EXT": extentRepNew,
"EXT_CRS": "EPSG:3857",
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
procRtn = processing.runalg("gdalogr:warpreproject",
warpArgs)
# force exception on algorithm fail
for val in procRtn:
pass
except:
try:
warpArgs = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RAST_EXT": extentRepNew,
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
procRtn = processing.runalg("gdalogr:warpreproject",
warpArgs)
# force exception on algorithm fail
for val in procRtn:
pass
except:
try:
warpArgs = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
procRtn = processing.runalg(
"gdalogr:warpreproject", warpArgs)
# force exception on algorithm fail
for val in procRtn:
pass
except:
shutil.copyfile(piped_file, piped_3857)
try:
processing.runalg("gdalogr:translate", piped_3857, 100,
True, "", 0, "", extentRepNew, False, 5,
4, 75, 6, 1, False, 0, False, "",
out_raster)
except:
shutil.copyfile(piped_3857, out_raster)
feedback.completeStep()
def exportRasterLayer(layer, safeLayerName, dataPath):
name_ts = safeLayerName + unicode(int(time.time()))
# We need to create a new file to export style
piped_file = os.path.join(tempfile.gettempdir(), name_ts + '_piped.tif')
piped_extent = layer.extent()
piped_width = layer.height()
piped_height = layer.width()
piped_crs = layer.crs()
piped_renderer = layer.renderer()
piped_provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(piped_provider.clone())
pipe.set(piped_renderer.clone())
file_writer = QgsRasterFileWriter(piped_file)
file_writer.writeRaster(pipe, piped_width, piped_height, piped_extent,
piped_crs)
# Extent of the layer in EPSG:3857
crsSrc = layer.crs()
crsDest = QgsCoordinateReferenceSystem(3857)
xform = QgsCoordinateTransform(crsSrc, crsDest)
extentRep = xform.transform(layer.extent())
extentRepNew = ','.join([
unicode(extentRep.xMinimum()),
unicode(extentRep.xMaximum()),
unicode(extentRep.yMinimum()),
unicode(extentRep.yMaximum())
])
# Reproject in 3857
piped_3857 = os.path.join(tempfile.gettempdir(),
name_ts + '_piped_3857.tif')
# Export layer as PNG
out_raster = dataPath + '.png'
qgis_version = QGis.QGIS_VERSION
if int(qgis_version.split('.')[1]) < 15:
processing.runalg("gdalogr:warpreproject", piped_file,
layer.crs().authid(), "EPSG:3857", "", 0, 1, 0, -1,
75, 6, 1, False, 0, False, "", piped_3857)
processing.runalg("gdalogr:translate", piped_3857, 100, True, "", 0,
"", extentRepNew, False, 0, 0, 75, 6, 1, False, 0,
False, "", out_raster)
else:
try:
warpArgs = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RAST_EXT": extentRepNew,
"EXT_CRS": "EPSG:3857",
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
procRtn = processing.runalg("gdalogr:warpreproject", warpArgs)
# force exception on algorithm fail
for val in procRtn:
pass
except:
try:
warpArgs = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RAST_EXT": extentRepNew,
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
procRtn = processing.runalg("gdalogr:warpreproject", warpArgs)
# force exception on algorithm fail
for val in procRtn:
pass
except:
try:
warpArgs = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
procRtn = processing.runalg("gdalogr:warpreproject",
warpArgs)
for val in procRtn:
pass
except:
shutil.copyfile(piped_file, piped_3857)
try:
processing.runalg("gdalogr:translate", piped_3857, 100, True, "",
0, "", extentRepNew, False, 5, 4, 75, 6, 1,
False, 0, False, "", out_raster)
except:
shutil.copyfile(piped_3857, out_raster)
def response_geotiff_mode(self, request):
"""
Export raster as geotiff
i.e:
192.168.1.137:8006/raster/api/geotiff/qdjango/190/sfondo_clip_c60533a4_743e_4734_9b95_514ac765ec4e/
192.168.1.137:8006/raster/api/geotiff/qdjango/190/europa_dem_8f0a9c30_5b96_4661_b747_8ce4f2679d6b/?map_extent=10.515901325263899%2C43.875701513907146%2C10.55669628723769%2C43.92294901234999
:param request: Http Django request object
:return: http response with attached file
"""
#if not self.layer.download:
# return HttpResponseForbidden()
tmp_dir = tempfile.TemporaryDirectory()
filename = f"{self.metadata_layer.qgis_layer.name()}.tif"
file_path = os.path.join(tmp_dir.name, filename)
writer = QgsRasterFileWriter(file_path)
provider = self.metadata_layer.qgis_layer.dataProvider()
renderer = self.metadata_layer.qgis_layer.renderer()
# Check for Url Params
if request.query_params.get('map_extent'):
me = request.query_params.get('map_extent').split(',')
orig_extent =provider.extent()
extent = QgsRectangle(float(me[0]), float(me[1]), float(me[2]), float(me[3]))
# If crs layer is not equal to project crs
if self.reproject:
ct = QgsCoordinateTransform(
QgsCoordinateReferenceSystem(f'EPSG:{self.layer.project.group.srid.srid}'),
self.metadata_layer.qgis_layer.crs(),
QgsCoordinateTransformContext()
)
extent = ct.transform(extent)
# Calc columns and rows
cols = int((extent.xMaximum() - extent.xMinimum()) /
(orig_extent.xMaximum() - orig_extent.xMinimum()) * provider.xSize())
rows = int((extent.yMaximum() - extent.yMinimum()) /
(orig_extent.yMaximum() - orig_extent.yMinimum()) * provider.ySize())
# For cols or rows lower than 0, we have to recalculate extent to guarantee minimal raster cell
if cols < 1:
cols = 1
new_wide_x_extent = (orig_extent.xMaximum() - orig_extent.xMinimum()) / provider.xSize()
off = (new_wide_x_extent - (extent.xMaximum() - extent.xMinimum())) / 2
extent.setXMinimum(extent.xMinimum() - off)
extent.setXMaximum(extent.xMaximum() + off)
if rows < 1:
rows = 1
new_wide_y_extent = (orig_extent.yMaximum() - orig_extent.yMinimum()) / provider.ySize()
off = (new_wide_y_extent - (extent.yMaximum() - extent.yMinimum())) / 2
extent.setYMinimum(extent.yMinimum() - off)
extent.setYMaximum(extent.yMaximum() + off)
else:
extent = provider.extent()
cols = provider.xSize()
rows = provider.ySize()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
pipe.set(renderer.clone())
error_code = writer.writeRaster(
pipe,
cols,
rows,
extent,
self.metadata_layer.qgis_layer.crs(),
self.metadata_layer.qgis_layer.transformContext()
)
if error_code != QgsRasterFileWriter.NoError:
tmp_dir.cleanup()
raise APIException(f"An error occoured on create raster file for export")
# Grab ZIP file from in-memory, make response with correct MIME-type
response = HttpResponse(
open(file_path, 'rb').read(), content_type='image/tif')
response['Content-Disposition'] = f'attachment; filename={filename}'
response.set_cookie('fileDownload', 'true')
return response
def exportRaster(layer, count, layersFolder, feedback):
feedback.showFeedback("Exporting %s to PNG..." % layer.name())
name_ts = (safeName(layer.name()) + unicode(count) +
unicode(int(time.time())))
# We need to create a new file to export style
piped_file = os.path.join(tempfile.gettempdir(), name_ts + '_piped.tif')
piped_extent = layer.extent()
piped_width = layer.height()
piped_height = layer.width()
piped_crs = layer.crs()
piped_renderer = layer.renderer()
piped_provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(piped_provider.clone())
pipe.set(piped_renderer.clone())
file_writer = QgsRasterFileWriter(piped_file)
file_writer.writeRaster(pipe, piped_width, piped_height, piped_extent,
piped_crs)
# Extent of the layer in EPSG:3857
crsSrc = layer.crs()
crsDest = QgsCoordinateReferenceSystem(3857)
xform = QgsCoordinateTransform(crsSrc, crsDest)
extentRep = xform.transform(layer.extent())
extentRepNew = ','.join([
unicode(extentRep.xMinimum()),
unicode(extentRep.xMaximum()),
unicode(extentRep.yMinimum()),
unicode(extentRep.yMaximum())
])
# Reproject in 3857
piped_3857 = os.path.join(tempfile.gettempdir(),
name_ts + '_piped_3857.tif')
# Export layer as PNG
out_raster = os.path.join(layersFolder,
safeName(layer.name()) + unicode(count) + ".png")
qgis_version = QGis.QGIS_VERSION
old_stdout = sys.stdout
sys.stdout = mystdout = StringIO()
try:
processing.runalg("gdalogr:warpreproject")
except:
pass
sys.stdout = old_stdout
params = {
"INPUT": piped_file,
"SOURCE_SRS": layer.crs().authid(),
"DEST_SRS": "EPSG:3857",
"NO_DATA": "",
"TR": 0,
"METHOD": 2,
"RAST_EXT": extentRepNew,
"EXT_CRS": "EPSG:3857",
"RTYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
warpArgs = {}
lines = mystdout.getvalue()
for count, line in enumerate(lines.split("\n\t")):
if count != 0 and line != " ":
try:
k = line.split(" ")[0]
warpArgs[k] = params[k]
except:
pass
if int(qgis_version.split('.')[1]) < 15:
processing.runalg("gdalogr:warpreproject", piped_file,
layer.crs().authid(), "EPSG:3857", "", 0, 1, 0, -1,
75, 6, 1, False, 0, False, "", piped_3857)
processing.runalg("gdalogr:translate", piped_3857, 100, True, "", 0,
"", extentRepNew, False, 0, 0, 75, 6, 1, False, 0,
False, "", out_raster)
else:
try:
procRtn = processing.runalg("gdalogr:warpreproject", warpArgs)
except:
shutil.copyfile(piped_file, piped_3857)
try:
processing.runalg("gdalogr:translate", piped_3857, 100, True, "",
0, "", extentRepNew, False, 5, 4, 75, 6, 1,
False, 0, False, "", out_raster)
except:
shutil.copyfile(piped_3857, out_raster)
def exportRaster(layer, count, layersFolder, feedback, iface, matchCRS):
feedback.showFeedback("Exporting %s to PNG..." % layer.name())
name_ts = (safeName(layer.name()) + unicode(count) +
unicode(int(time.time())))
# We need to create a new file to export style
piped_file = os.path.join(tempfile.gettempdir(), name_ts + '_piped.tif')
piped_extent = layer.extent()
piped_width = layer.height()
piped_height = layer.width()
piped_crs = layer.crs()
piped_renderer = layer.renderer()
piped_provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(piped_provider.clone())
pipe.set(piped_renderer.clone())
file_writer = QgsRasterFileWriter(piped_file)
file_writer.writeRaster(pipe, piped_height, -1, piped_extent, piped_crs)
# Export layer as PNG
out_raster = os.path.join(layersFolder, safeName(layer.name()) + "_" +
unicode(count) + ".png")
projectCRS = iface.mapCanvas().mapSettings().destinationCrs()
if not (matchCRS and layer.crs() == projectCRS):
# Extent of the layer in EPSG:3857
crsSrc = layer.crs()
crsDest = QgsCoordinateReferenceSystem(3857)
try:
xform = QgsCoordinateTransform(crsSrc, crsDest,
QgsProject.instance())
except:
xform = QgsCoordinateTransform(crsSrc, crsDest)
extentRep = xform.transformBoundingBox(layer.extent())
extentRepNew = ','.join([unicode(extentRep.xMinimum()),
unicode(extentRep.xMaximum()),
unicode(extentRep.yMinimum()),
unicode(extentRep.yMaximum())])
# Reproject in 3857
piped_3857 = os.path.join(tempfile.gettempdir(),
name_ts + '_piped_3857.tif')
qgis_version = Qgis.QGIS_VERSION
old_stdout = sys.stdout
sys.stdout = mystdout = StringIO()
try:
processing.algorithmHelp("gdal:warpreproject")
except:
pass
sys.stdout = old_stdout
params = {
"INPUT": piped_file,
"SOURCE_CRS": layer.crs().authid(),
"TARGET_CRS": "EPSG:3857",
"NODATA": 0,
"TARGET_RESOLUTION": 0,
"RESAMPLING": 2,
"TARGET_EXTENT": extentRepNew,
"EXT_CRS": "EPSG:3857",
"TARGET_EXTENT_CRS": "EPSG:3857",
"DATA_TYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"MULTITHREADING": False,
"COPY_SUBDATASETS": False,
"EXTRA": "",
"OUTPUT": piped_3857
}
warpArgs = {}
lines = mystdout.getvalue()
for count, line in enumerate(lines.split("\n")):
if count != 0 and ":" in line:
try:
k = line.split(":")[0]
warpArgs[k] = params[k]
except:
pass
try:
processing.run("gdal:warpreproject", warpArgs)
except:
shutil.copyfile(piped_file, piped_3857)
try:
processing.run("gdal:translate", {"INPUT": piped_3857,
"OUTSIZE": 100,
"OUTSIZE_PERC": True,
"NODATA": 0,
"EXPAND": 0,
"TARGET_CRS": "",
"PROJWIN": extentRepNew,
"SDS": False,
"DATA_TYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"COPY_SUBDATASETS": False,
"OPTIONS": "",
"OUTPUT": out_raster})
except:
shutil.copyfile(piped_3857, out_raster)
else:
srcExtent = ','.join([unicode(piped_extent.xMinimum()),
unicode(piped_extent.xMaximum()),
unicode(piped_extent.yMinimum()),
unicode(piped_extent.yMaximum())])
processing.run("gdal:translate", {"INPUT": piped_file,
"OUTSIZE": 100,
"OUTSIZE_PERC": True,
"NODATA": 0,
"EXPAND": 0,
"TARGET_CRS": "",
"PROJWIN": srcExtent,
"SDS": False,
"DATA_TYPE": 0,
"COMPRESS": 4,
"JPEGCOMPRESSION": 75,
"ZLEVEL": 6,
"PREDICTOR": 1,
"TILED": False,
"BIGTIFF": 0,
"TFW": False,
"COPY_SUBDATASETS": False,
"OPTIONS": "",
"OUTPUT": out_raster})
def Color(self, file_in, calcType=None):
"""
Color the Inbound file (Essentially the File we JUST exported) and display it to screen)
:param file_in: The file that was just exported
:type file_in: FileImport
:return: TO SCREEN Rendered Image
:rtype: None
"""
k = self.iface.addRasterLayer(file_in.filePath, file_in.baseName)
stats = k.dataProvider().bandStatistics(1, QgsRasterBandStats.All,
k.extent(), 0)
minimum = stats.minimumValue
maximum = stats.maximumValue
self.com.log("Color func: [Min val: {0} | Max val: {1}".format(
str(minimum), str(maximum)),
level=0)
ramp_shader = QgsColorRampShader()
ramp_shader.setColorRampType(QgsColorRampShader.INTERPOLATED)
if calcType is None:
color_list = [
QgsColorRampShader.ColorRampItem(minimum, QColor(255, 0, 0)),
QgsColorRampShader.ColorRampItem(0, QColor(255, 207, 74, 255)),
QgsColorRampShader.ColorRampItem(maximum, QColor(0, 255, 0))
]
elif calcType == "EVI":
color_list = [
QgsColorRampShader.ColorRampItem(-2, QColor(255, 0, 0)),
QgsColorRampShader.ColorRampItem(0, QColor(255, 207, 74, 255)),
QgsColorRampShader.ColorRampItem(2, QColor(0, 255, 0))
]
else:
color_list = [
QgsColorRampShader.ColorRampItem(minimum, QColor(255, 0, 0)),
QgsColorRampShader.ColorRampItem(0, QColor(255, 207, 74, 255)),
QgsColorRampShader.ColorRampItem(maximum, QColor(0, 255, 0))
]
ramp_shader.setColorRampItemList(color_list)
shader = QgsRasterShader()
shader.setRasterShaderFunction(ramp_shader)
renderer = QgsSingleBandPseudoColorRenderer(k.dataProvider(), 1,
shader)
k.setRenderer(renderer)
"""
Export colored image to file
"""
export_path = file_in.filePath + ".colored.tif"
file_writer = QgsRasterFileWriter(export_path)
pipe = QgsRasterPipe()
provide = k.dataProvider()
# Pipe Setter
if not pipe.set(provide.clone()):
self.com.error(Bold="PipeProviderError:",
String="Cannot set pipe provider",
level=1,
duration=3)
self.com.log(
"mainPlug - Color: Pipe provider error on line 473, Continuing...",
level=1)
self.com.log(str(pipe.renderer()), level=0)
pipe.set(renderer.clone())
file_writer.writeRaster(pipe, provide.xSize(), provide.ySize(),
provide.extent(), provide.crs())
pcolor = []
pcolor.append(QgsColorRampShader.ColorRampItem(1, QColor("#d2ca97")))
pcolor.append(QgsColorRampShader.ColorRampItem(2, QColor("#f7f7f7")))
pcolor.append(QgsColorRampShader.ColorRampItem(3, QColor("#a1d99b")))
pcolor.append(QgsColorRampShader.ColorRampItem(4, QColor("#41ab5d")))
pcolor.append(QgsColorRampShader.ColorRampItem(5, QColor("#006d2c")))
pcolor.append(QgsColorRampShader.ColorRampItem(6, QColor("#00441b")))
renderer = QgsPalettedRasterRenderer(layer.dataProvider(), 1,
QgsPalettedRasterRenderer.colorTableToClassData(pcolor))
layer.setRenderer(renderer)
extent = layer.extent()
width, height = layer.width(), layer.height()
renderer = layer.renderer()
provider = layer.dataProvider()
crs = layer.crs().toWkt()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
pipe.set(renderer.clone())
file_writer = QgsRasterFileWriter("C:/temp/naip/classified_res.tif")
file_writer.writeRaster(pipe,
width,
height,
extent,
layer.crs())
print("Done!")
def exportRasterLayer(self, layer, destinationFile, options=None):
outputFormat = self.settings[
'rasterFormat'] if 'rasterFormat' in self.settings else 'GTiff'
if os.path.splitext(destinationFile)[1] == '':
formats = QgsRasterFileWriter.extensionsForFormat(outputFormat)
if len(formats) > 0:
destinationFile = '{}.{}'.format(destinationFile, formats[0])
provider = layer.dataProvider()
cols = provider.xSize()
rows = provider.ySize()
if not provider.capabilities() & QgsRasterDataProvider.Size:
k = float(provider.extent().width()) / float(
provider.extent().height())
cols = RASTER_SIZE * k
rows = RASTER_SIZE
pipe = QgsRasterPipe()
if not pipe.set(provider.clone()):
QgsMessageLog.logMessage(
self.
tr('Failed to export layer "{layer}": Cannot set pipe provider.'
).format(layer=layer.name()), 'QConsolidate', Qgis.Warning)
return False, None
nodata = {}
for i in range(1, provider.bandCount() + 1):
if provider.sourceHasNoDataValue(i):
value = provider.sourceNoDataValue(i)
nodata[i] = QgsRasterRange(value, value)
nuller = QgsRasterNuller()
for band, value in nodata.items():
nuller.setNoData(band, [value])
if not pipe.insert(1, nuller):
QgsMessageLog.logMessage(
self.tr(
'Failed to export layer "{layer}": Cannot set pipe nuller.'
).format(layer=layer.name()), 'QConsolidate', Qgis.Warning)
return False, None
writer = QgsRasterFileWriter(destinationFile)
writer.setOutputFormat(outputFormat)
if options is not None:
writer.setCreateOptions(options)
success = True
error = writer.writeRaster(pipe, cols, rows, provider.extent(),
provider.crs())
if error != QgsRasterFileWriter.NoError:
QgsMessageLog.logMessage(
self.tr('Failed to export layer "{layer}": {message}.').format(
layer=layer.name(), message=error), 'QConsolidate',
Qgis.Warning)
success = False
return success, destinationFile