def multibandRasterLayer(self) -> QgsRasterLayer:
try:
from utilities import unitTestDataPath
path = pathlib.Path(unitTestDataPath()) / 'landsat_4326.tif'
except ModuleNotFoundError:
path = pathlib.Path(__file__).parent / 'landsat_4326.tif'
assert isinstance(path, pathlib.Path) and path.is_file()
lyr = QgsRasterLayer(path.as_posix())
lyr.setName(path.name)
self.assertIsInstance(lyr, QgsRasterLayer)
self.assertTrue(lyr.isValid())
self.assertTrue(lyr.bandCount() > 1)
return lyr
def add_raster_layer(self, path, id):
"""Add a downloaded raster layer to the workspace."""
# create a new rasterlayer from the supplied TIF file
layer = QgsRasterLayer(path, id)
# load layer style based on number of bands
bands = layer.bandCount()
if bands == 1:
path = os.path.join(self.plugin_dir, 'styles', 'singleband.qml')
else:
path = os.path.join(self.plugin_dir, 'styles', 'multiband.qml')
layer.loadNamedStyle(path)
# add the layer to the workspace
QgsMapLayerRegistry.instance().addMapLayer(layer)
def set_band_based_on_range(layer: QgsRasterLayer, t_range: QgsDateTimeRange) -> int:
"""
Set raster layer band based on temporal range
:param layer: Raster layer
:param t_range: temporal range
:return: band number
"""
band_num = 1
tprops: QgsRasterLayerTemporalProperties = layer.temporalProperties()
if (
tprops.isVisibleInTemporalRange(t_range)
and t_range.begin().isValid()
and t_range.end().isValid()
):
if tprops.mode() == QgsRasterLayerTemporalProperties.ModeFixedTemporalRange:
layer_t_range: QgsDateTimeRange = tprops.fixedTemporalRange()
start: datetime.datetime = layer_t_range.begin().toPyDateTime()
end: datetime.datetime = layer_t_range.end().toPyDateTime()
delta = (end - start) / layer.bandCount()
band_num = int((t_range.begin().toPyDateTime() - start) / delta) + 1
set_raster_renderer_to_singleband(layer, band_num)
return band_num
def readRasterLayer(i, allBandData):
# pylint: disable=too-many-locals
fileInfo = QFileInfo(shared.rasterFileName[i])
fileBaseName = fileInfo.baseName()
layer = QgsRasterLayer(shared.rasterFileName[i], fileBaseName)
if not layer.isValid():
shared.fpOut.write("Raster layer '" + shared.rasterFileName[i] +
"'failed to load")
return -1
# Store the title as the first list item
allBandData.append(shared.rasterFileTitle[i])
# Get more info
xSize = layer.width()
ySize = layer.height()
cellWidth = layer.rasterUnitsPerPixelX()
cellHeight = layer.rasterUnitsPerPixelY()
provider = layer.dataProvider()
extnt = provider.extent()
dpi = provider.dpi()
shared.fpOut.write("Raster layer '" + shared.rasterFileTitle[i] +
"' loaded with X, Y resolution = " + str(cellWidth) +
", " + str(cellHeight) + " m\n")
#shared.fpOut.write(layer.metadata())
#shared.fpOut.write(layer.rasterType())
# Store the above as the second list item
allBandData.append(
[provider, xSize, ySize, cellWidth, cellHeight, extnt, dpi])
# Now store the data for each band as a QgsRasterBlock
nBands = layer.bandCount()
for band in range(nBands):
#shared.fpOut.write(layer.bandName(i))
bandData = provider.block(band, extnt, xSize, ySize)
# Store as a further list item
allBandData.append(bandData)
# Sort out style
#shared.fpOut.write("Style file " + str(i) + " is " + shared.rasterFileStyle[i])
if not shared.rasterFileStyle[i]:
# No style file specified, so try the default style for this layer
shared.rasterFileStyle[i] = layer.styleURI()
#shared.fpOut.write("Trying default style file " + shared.rasterFileStyle[i])
if not layer.loadDefaultStyle():
shared.fpOut.write("Could not load default style '" +
shared.rasterFileStyle[i] +
"' for raster layer '" +
shared.rasterFileTitle[i] + "'")
else:
# A style file was specified, so try to load it
#shared.fpOut.write("Trying style file " + shared.rasterFileStyle[i])
if not layer.loadNamedStyle(shared.rasterFileStyle[i]):
shared.fpOut.write("Could not load style '" +
shared.rasterFileStyle[i] +
"' for raster layer '" +
shared.rasterFileTitle[i] + "'")
# Set opacity
layer.renderer().setOpacity(shared.rasterFileOpacity[i])
# Add this layer to the app's registry
QgsProject.instance().addMapLayer(layer)
return layer
projInfo=dem .GetProjection() print projInfo demLayer = QgsRasterLayer(os.path.join(input_Dir,dem_filename), "dem") if not demLayer.isValid(): print "DEM Layer failed to load!" # Load raster layer into canvas QgsMapLayerRegistry.instance().addMapLayer(demLayer) # Print Extent of the DEM layer (for use with raster calculator) print demLayer.extent().xMinimum(), demLayer.extent().xMaximum() print demLayer.extent().yMinimum(), demLayer.extent().yMaximum() print demLayer.width(), demLayer.height() name = demLayer.name() print name bands = demLayer.bandCount() print bands # Slope layer degslopeLayer = QgsRasterLayer(os.path.join(input_Dir,'slope_dec.tif'), "Degrees_Slope") if not degslopeLayer.isValid(): print "Slope (decimal degrees) Layer failed to load!" # Load raster layer into canvas QgsMapLayerRegistry.instance().addMapLayer(degslopeLayer) # Aspect layer degaspectLayer = QgsRasterLayer(os.path.join(input_Dir,'aspect_dec.tif'), "Degrees_Aspect") if not degaspectLayer.isValid(): print "Aspect (decimal degrees) Layer failed to load!" # Load raster layer into canvas QgsMapLayerRegistry.instance().addMapLayer(degaspectLayer) # Importing collar GPS data
