def exportRaster(parameters):
# Open layer from inputFile
inputFile = 'Ugrid:' + '"' + parameters['INPUT_LAYER'] + '"'
meshfile = inputFile.strip().split('/')[-1]
meshlayer = meshfile.split('.')[0]
layer = QgsMeshLayer(inputFile, meshlayer, 'mdal')
# Check if layer is valid
if layer.isValid() is True:
# Get parameters for processing
dataset = parameters['INPUT_GROUP']
timestep = parameters['INPUT_TIMESTEP']
mupp = parameters['MAP_UNITS_PER_PIXEL']
extent = layer.extent()
output_layer = parameters['OUTPUT_RASTER']
width = extent.width() / mupp
height = extent.height() / mupp
crs = layer.crs()
crs.createFromSrid(4326)
transform_context = QgsProject.instance().transformContext()
output_format = QgsRasterFileWriter.driverForExtension(
os.path.splitext(output_layer)[1])
# Open output file for writing
rfw = QgsRasterFileWriter(output_layer)
rfw.setOutputProviderKey('gdal')
rfw.setOutputFormat(output_format)
# Create one band raster
rdp = rfw.createOneBandRaster(Qgis.Float64, width, height, extent, crs)
# Get dataset index
dataset_index = QgsMeshDatasetIndex(dataset, timestep)
# Regred mesh layer to raster
block = QgsMeshUtils.exportRasterBlock(layer, dataset_index, crs,
transform_context, mupp, extent)
# Write raster to GeoTiff file
rdp.writeBlock(block, 1)
rdp.setNoDataValue(1, block.noDataValue())
rdp.setEditable(False)
logger.info('Regridded mesh data in ' + meshfile.split('"')[0] +
' to float64 grid, and saved to tiff (' +
output_layer.split('/')[-1] + ') file.')
return (output_layer)
if layer.isValid() is False:
raise Exception('Invalid mesh')
def testStepSize(self):
ml = QgsMeshLayer(
os.path.join(unitTestDataPath(), '3d', 'elev_mesh.2dm'), 'mdal',
'mdal')
self.assertTrue(ml.isValid())
ml.setCrs(QgsCoordinateReferenceSystem('EPSG:27700'))
curve = QgsLineString()
curve.fromWkt(
'LineString (-348095.18706532847136259 6633687.0235139261931181, -347271.57799367723055184 6633093.13086318597197533, -346140.60267287614988163 6632697.89590711053460836, -345777.013075890194159 6631575.50219972990453243)'
)
req = QgsProfileRequest(curve)
# set a smaller step size then would be automatically calculated
req.setStepDistance(10)
# set correct crs for linestring and re-try
req.setCrs(QgsCoordinateReferenceSystem('EPSG:3857'))
generator = ml.createProfileGenerator(req)
self.assertTrue(generator.generateProfile())
r = generator.takeResults()
results = r.distanceToHeightMap()
self.assertEqual(len(results), 216)
first_point = min(results.keys())
last_point = max(results.keys())
self.assertAlmostEqual(results[first_point], 152.87405434310168, 0)
self.assertAlmostEqual(results[last_point], 98.78085001573021, 0)
self.assertAlmostEqual(r.zRange().lower(), 80, 2)
self.assertAlmostEqual(r.zRange().upper(), 152.874, 0)
def testMeshProvider(self):
"""
Test QgsMeshTerrainProvider
"""
provider = QgsMeshTerrainProvider()
self.assertEqual(provider.type(), 'mesh')
# without layer assigned
self.assertFalse(provider.crs().isValid())
self.assertTrue(math.isnan(provider.heightAt(1, 2)))
# add mesh layer to project
p = QgsProject()
mesh_layer = QgsMeshLayer(
os.path.join(unitTestDataPath(), 'mesh', 'quad_flower.2dm'),
'mesh', 'mdal')
self.assertTrue(mesh_layer.isValid())
p.addMapLayer(mesh_layer)
provider.setLayer(mesh_layer)
self.assertEqual(provider.layer(), mesh_layer)
# not implemented yet
# self.assertEqual(provider.heightAt(1,2), 0)
# self.assertEqual(provider.heightAt(106.4105,-6.6341), 11.0)
provider.setOffset(5)
self.assertEqual(provider.offset(), 5)
provider.setScale(3)
self.assertEqual(provider.scale(), 3)
clone = provider.clone()
self.assertIsInstance(clone, QgsMeshTerrainProvider)
self.assertEqual(clone.layer(), mesh_layer)
self.assertEqual(clone.offset(), 5)
self.assertEqual(clone.scale(), 3)
# via xml
doc = QDomDocument("testdoc")
context = QgsReadWriteContext()
parent_elem = doc.createElement('test')
element = provider.writeXml(doc, context)
parent_elem.appendChild(element)
from_xml = QgsMeshTerrainProvider()
self.assertTrue(from_xml.readXml(parent_elem, context))
self.assertEqual(from_xml.offset(), 5)
self.assertEqual(from_xml.scale(), 3)
# layer won't be resolved till we resolve references from project
self.assertFalse(from_xml.layer())
from_xml.resolveReferences(p)
self.assertEqual(from_xml.layer(), mesh_layer)
def testSnapping(self):
ml = QgsMeshLayer(os.path.join(unitTestDataPath(), '3d', 'elev_mesh.2dm'), 'mdal', 'mdal')
self.assertTrue(ml.isValid())
ml.setCrs(QgsCoordinateReferenceSystem('EPSG:27700'))
curve = QgsLineString()
curve.fromWkt('LineString (321621.3770066662109457 129734.87810317709227093, 321894.21278918092139065 129858.49142702402605209)')
req = QgsProfileRequest(curve)
generator = ml.createProfileGenerator(req)
self.assertTrue(generator.generateProfile())
r = generator.takeResults()
# try snapping some points
context = QgsProfileSnapContext()
res = r.snapPoint(QgsProfilePoint(-10, -10), context)
self.assertFalse(res.isValid())
context.maximumSurfaceDistanceDelta = 0
context.maximumSurfaceElevationDelta = 3
context.maximumPointDistanceDelta = 0
context.maximumPointElevationDelta = 0
res = r.snapPoint(QgsProfilePoint(0, 70), context)
self.assertTrue(res.isValid())
self.assertEqual(res.snappedPoint.distance(), 0)
self.assertAlmostEqual(res.snappedPoint.elevation(), 71.8, 0)
context.maximumSurfaceDistanceDelta = 0
context.maximumSurfaceElevationDelta = 5
res = r.snapPoint(QgsProfilePoint(200, 79), context)
self.assertTrue(res.isValid())
self.assertEqual(res.snappedPoint.distance(), 200)
self.assertAlmostEqual(res.snappedPoint.elevation(), 75.841, 1)
res = r.snapPoint(QgsProfilePoint(200, 85), context)
self.assertFalse(res.isValid())
def testIdentify(self):
ml = QgsMeshLayer(os.path.join(unitTestDataPath(), '3d', 'elev_mesh.2dm'), 'mdal', 'mdal')
self.assertTrue(ml.isValid())
ml.setCrs(QgsCoordinateReferenceSystem('EPSG:27700'))
curve = QgsLineString()
curve.fromWkt('LineString (321621.3770066662109457 129734.87810317709227093, 321894.21278918092139065 129858.49142702402605209)')
req = QgsProfileRequest(curve)
generator = ml.createProfileGenerator(req)
self.assertTrue(generator.generateProfile())
r = generator.takeResults()
# try identifying
context = QgsProfileIdentifyContext()
res = r.identify(QgsProfilePoint(-10, -10), context)
self.assertFalse(res)
context.maximumSurfaceDistanceDelta = 0
context.maximumSurfaceElevationDelta = 3
context.maximumPointDistanceDelta = 0
context.maximumPointElevationDelta = 0
res = r.identify(QgsProfilePoint(0, 70), context)
self.assertEqual(len(res), 1)
self.assertEqual(res[0].layer(), ml)
self.assertEqual(res[0].results(), [{'distance': 0.0, 'elevation': 71.8236528075051}])
context.maximumSurfaceDistanceDelta = 0
context.maximumSurfaceElevationDelta = 5
res = r.identify(QgsProfilePoint(200, 79), context)
self.assertEqual(len(res), 1)
self.assertEqual(res[0].layer(), ml)
self.assertEqual(res[0].results(), [{'distance': 200.0, 'elevation': 75.84131736154015}])
res = r.identify(QgsProfilePoint(200, 85), context)
self.assertFalse(res)
def testMeshProvider(self):
"""
Test QgsMeshTerrainProvider
"""
provider = QgsMeshTerrainProvider()
self.assertEqual(provider.type(), 'mesh')
# without layer assigned
self.assertFalse(provider.crs().isValid())
self.assertTrue(math.isnan(provider.heightAt(1, 2)))
# add mesh layer to project
p = QgsProject()
mesh_layer = QgsMeshLayer(
os.path.join(unitTestDataPath(), '3d', 'elev_mesh.2dm'), 'mdal',
'mdal')
mesh_layer.setCrs(QgsCoordinateReferenceSystem('EPSG:27700'))
self.assertTrue(mesh_layer.isValid())
p.addMapLayer(mesh_layer)
provider.setLayer(mesh_layer)
self.assertEqual(provider.layer(), mesh_layer)
self.assertEqual(provider.crs().authid(), 'EPSG:27700')
self.assertTrue(math.isnan(provider.heightAt(1, 2)))
self.assertAlmostEqual(provider.heightAt(321695.2, 129990.5),
89.49743150684921, 5)
provider.setOffset(5)
self.assertEqual(provider.offset(), 5)
provider.setScale(3)
self.assertEqual(provider.scale(), 3)
clone = provider.clone()
self.assertIsInstance(clone, QgsMeshTerrainProvider)
self.assertEqual(clone.layer(), mesh_layer)
self.assertEqual(clone.offset(), 5)
self.assertEqual(clone.scale(), 3)
# via xml
doc = QDomDocument("testdoc")
context = QgsReadWriteContext()
parent_elem = doc.createElement('test')
element = provider.writeXml(doc, context)
parent_elem.appendChild(element)
from_xml = QgsMeshTerrainProvider()
self.assertTrue(from_xml.readXml(parent_elem, context))
self.assertEqual(from_xml.offset(), 5)
self.assertEqual(from_xml.scale(), 3)
# layer won't be resolved till we resolve references from project
self.assertFalse(from_xml.layer())
from_xml.resolveReferences(p)
self.assertEqual(from_xml.layer(), mesh_layer)
# test equals
provider1 = QgsMeshTerrainProvider()
provider2 = QgsMeshTerrainProvider()
self.assertTrue(provider1.equals(provider2))
self.assertFalse(provider1.equals(QgsFlatTerrainProvider()))
provider1.setOffset(1)
self.assertFalse(provider1.equals(provider2))
provider2.setOffset(1)
self.assertTrue(provider1.equals(provider2))
provider1.setScale(11)
self.assertFalse(provider1.equals(provider2))
provider2.setScale(11)
self.assertTrue(provider1.equals(provider2))
provider1.setLayer(mesh_layer)
self.assertFalse(provider1.equals(provider2))
provider2.setLayer(mesh_layer)
self.assertTrue(provider1.equals(provider2))