本文整理汇总了Python中qgis.core.QgsDatumTransform类的典型用法代码示例。如果您正苦于以下问题：Python QgsDatumTransform类的具体用法？Python QgsDatumTransform怎么用？Python QgsDatumTransform使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了QgsDatumTransform类的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testWriteReadXml
def testWriteReadXml(self):
# setup a context
context = QgsCoordinateTransformContext()
source_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
source_id_2 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_2 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326), source_id_1, dest_id_1))
self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326), source_id_2, dest_id_2))
self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})
# save to xml
doc = QDomDocument("testdoc")
elem = doc.createElement("test")
context.writeXml(elem, QgsReadWriteContext())
# restore from xml
context2 = QgsCoordinateTransformContext()
context2.readXml(elem, QgsReadWriteContext())
# check result
self.assertEqual(context2.sourceDestinationDatumTransforms(), {('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})示例2: testStringToTransformId
def testStringToTransformId(self):
"""
Test converting proj strings to corresponding datum IDs
"""
self.assertEqual(QgsDatumTransform.projStringToDatumTransformId(''), -1)
self.assertEqual(QgsDatumTransform.projStringToDatumTransformId('not'), -1)
test_string = '+towgs84=-403,684,41'
id = QgsDatumTransform.projStringToDatumTransformId(test_string)
self.assertNotEqual(id, -1)
string = QgsDatumTransform.datumTransformToProj(id)
self.assertEqual(string, test_string)
self.assertEqual(QgsDatumTransform.projStringToDatumTransformId(test_string.upper()), id)示例3: testTransformInfo
def testTransformInfo(self):
# hopefully this transform is available on all platforms!
transforms = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4613), QgsCoordinateReferenceSystem(4326))
self.assertTrue(len(transforms) > 0)
self.assertIn('+towgs84=-403,684,41', [QgsDatumTransform.datumTransformToProj(t.sourceTransformId) for t in transforms])
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformToProj(t.destinationTransformId) for t in transforms])
self.assertIn('EPSG:4613', [QgsDatumTransform.datumTransformInfo(t.sourceTransformId).sourceCrsAuthId for t in
transforms])
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformInfo(t.destinationTransformId).destinationCrsAuthId for t in
transforms])
# and the reverse
transforms = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4326), QgsCoordinateReferenceSystem(4613))
self.assertTrue(len(transforms) > 0)
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformToProj(t.sourceTransformId) for t in transforms])
self.assertIn('+towgs84=-403,684,41',
[QgsDatumTransform.datumTransformToProj(t.destinationTransformId) for t in transforms])
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformInfo(t.sourceTransformId).destinationCrsAuthId for t in
transforms])
self.assertIn('EPSG:4613', [QgsDatumTransform.datumTransformInfo(t.destinationTransformId).sourceCrsAuthId for t in
transforms])示例4: testReadWriteSettings
def testReadWriteSettings(self):
context = QgsCoordinateTransformContext()
context.readSettings()
source_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
source_id_2 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_2 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
# should be empty
self.assertEqual(context.sourceDestinationDatumTransforms(), {})
self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:4204'),
QgsCoordinateReferenceSystem('EPSG:4326'),
source_id_1, dest_id_1))
self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:4205'),
QgsCoordinateReferenceSystem(4326), source_id_2,
dest_id_2))
self.assertEqual(context.sourceDestinationDatumTransforms(),
{('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})
# save to settings
context.writeSettings()
# restore from settings
context2 = QgsCoordinateTransformContext()
self.assertEqual(context2.sourceDestinationDatumTransforms(), {})
context2.readSettings()
# check result
self.assertEqual(context2.sourceDestinationDatumTransforms(),
{('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})示例5: testOperations
def testOperations(self):
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem(),
QgsCoordinateReferenceSystem())
self.assertEqual(ops, [])
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem('EPSG:3111'),
QgsCoordinateReferenceSystem())
self.assertEqual(ops, [])
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem(),
QgsCoordinateReferenceSystem('EPSG:3111'))
self.assertEqual(ops, [])
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem('EPSG:3111'),
QgsCoordinateReferenceSystem('EPSG:3111'))
self.assertEqual(len(ops), 1)
self.assertTrue(ops[0].name)
self.assertEqual(ops[0].proj, '+proj=noop')
self.assertEqual(ops[0].accuracy, 0.0)
self.assertTrue(ops[0].isAvailable)
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem('EPSG:3111'),
QgsCoordinateReferenceSystem('EPSG:4283'))
self.assertEqual(len(ops), 1)
self.assertTrue(ops[0].name)
self.assertEqual(ops[0].proj, '+proj=pipeline +step +inv +proj=lcc +lat_0=-37 +lon_0=145 +lat_1=-36 +lat_2=-38 +x_0=2500000 +y_0=2500000 +ellps=GRS80 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1')
self.assertEqual(ops[0].accuracy, -1.0)
self.assertTrue(ops[0].isAvailable)
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem('EPSG:3111'),
QgsCoordinateReferenceSystem('EPSG:28355'))
self.assertEqual(len(ops), 1)
self.assertTrue(ops[0].name)
self.assertEqual(ops[0].proj, '+proj=pipeline +step +inv +proj=lcc +lat_0=-37 +lon_0=145 +lat_1=-36 +lat_2=-38 +x_0=2500000 +y_0=2500000 +ellps=GRS80 +step +proj=utm +zone=55 +south +ellps=GRS80')
self.assertEqual(ops[0].accuracy, 0.0)
self.assertTrue(ops[0].isAvailable)
# uses a grid file
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem('EPSG:4283'),
QgsCoordinateReferenceSystem('EPSG:7844'))
self.assertGreaterEqual(len(ops), 5)
op1_index = [i for i in range(len(ops)) if ops[i].proj == '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=GRS80 +step +proj=helmert +x=0.06155 +y=-0.01087 +z=-0.04019 +rx=-0.0394924 +ry=-0.0327221 +rz=-0.0328979 +s=-0.009994 +convention=coordinate_frame +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'][0]
self.assertTrue(ops[op1_index].name)
self.assertEqual(ops[op1_index].proj, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=GRS80 +step +proj=helmert +x=0.06155 +y=-0.01087 +z=-0.04019 +rx=-0.0394924 +ry=-0.0327221 +rz=-0.0328979 +s=-0.009994 +convention=coordinate_frame +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1')
self.assertTrue(ops[op1_index].isAvailable)
self.assertEqual(ops[op1_index].accuracy, 0.01)
self.assertEqual(len(ops[op1_index].grids), 0)
op2_index = [i for i in range(len(ops)) if ops[i].proj == '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal_and_distortion.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'][0]
self.assertTrue(ops[op2_index].name)
self.assertEqual(ops[op2_index].proj, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal_and_distortion.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1')
self.assertEqual(ops[op2_index].accuracy, 0.05) # actually incorrect in EPSG registry, may need updating
self.assertEqual(len(ops[op2_index].grids), 1)
self.assertEqual(ops[op2_index].grids[0].shortName, 'GDA94_GDA2020_conformal_and_distortion.gsb')
self.assertEqual(ops[op2_index].grids[0].fullName, '')
self.assertEqual(ops[op2_index].grids[0].packageName, 'proj-datumgrid-oceania')
self.assertEqual(ops[op2_index].grids[0].url, 'https://download.osgeo.org/proj/proj-datumgrid-oceania-latest.zip')
self.assertTrue(ops[op2_index].grids[0].directDownload)
self.assertTrue(ops[op2_index].grids[0].openLicense)
op3_index = [i for i in range(len(ops)) if ops[i].proj == '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'][0]
self.assertTrue(ops[op3_index].name)
self.assertEqual(ops[op3_index].proj, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1')
self.assertEqual(ops[op3_index].accuracy, 0.05) # actually incorrect in EPSG registry, may need updating
self.assertEqual(len(ops[op3_index].grids), 1)
self.assertEqual(ops[op3_index].grids[0].shortName, 'GDA94_GDA2020_conformal.gsb')
self.assertEqual(ops[op3_index].grids[0].fullName, '')
self.assertEqual(ops[op3_index].grids[0].packageName, 'proj-datumgrid-oceania')
self.assertEqual(ops[op3_index].grids[0].url, 'https://download.osgeo.org/proj/proj-datumgrid-oceania-latest.zip')
self.assertTrue(ops[op3_index].grids[0].directDownload)
self.assertTrue(ops[op3_index].grids[0].openLicense)
op4_index = [i for i in range(len(ops)) if ops[i].proj == '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal_cocos_island.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'][0]
self.assertTrue(ops[op4_index].name)
self.assertEqual(ops[op4_index].proj, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal_cocos_island.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1')
self.assertEqual(ops[op4_index].accuracy, 0.05) # actually incorrect in EPSG registry, may need updating
self.assertEqual(len(ops[op4_index].grids), 1)
self.assertEqual(ops[op4_index].grids[0].shortName, 'GDA94_GDA2020_conformal_cocos_island.gsb')
self.assertEqual(ops[op4_index].grids[0].fullName, '')
op5_index = [i for i in range(len(ops)) if ops[i].proj == '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal_christmas_island.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'][0]
self.assertTrue(ops[op5_index].name)
self.assertEqual(ops[op5_index].proj, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=GDA94_GDA2020_conformal_christmas_island.gsb +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1')
self.assertEqual(ops[op5_index].accuracy, 0.05) # actually incorrect in EPSG registry, may need updating
self.assertEqual(len(ops[op5_index].grids), 1)
self.assertEqual(ops[op5_index].grids[0].shortName, 'GDA94_GDA2020_conformal_christmas_island.gsb')
self.assertEqual(ops[op5_index].grids[0].fullName, '')
# uses a pivot datum (technically a proj test, but this will help me sleep at night ;)
ops = QgsDatumTransform.operations(QgsCoordinateReferenceSystem('EPSG:3111'),
QgsCoordinateReferenceSystem('EPSG:7899'))
self.assertGreaterEqual(len(ops), 3)
op1_index = [i for i in range(len(ops)) if ops[i].proj == '+proj=pipeline +step +inv +proj=lcc +lat_0=-37 +lon_0=145 +lat_1=-36 +lat_2=-38 +x_0=2500000 +y_0=2500000 +ellps=GRS80 +step +proj=push +v_3 +step +proj=cart +ellps=GRS80 +step +proj=helmert +x=0.06155 +y=-0.01087 +z=-0.04019 +rx=-0.0394924 +ry=-0.0327221 +rz=-0.0328979 +s=-0.009994 +convention=coordinate_frame +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=lcc +lat_0=-37 +lon_0=145 +lat_1=-36 +lat_2=-38 +x_0=2500000 +y_0=2500000 +ellps=GRS80'][0]
self.assertTrue(ops[op1_index].name)
self.assertEqual(ops[op1_index].proj, '+proj=pipeline +step +inv +proj=lcc +lat_0=-37 +lon_0=145 +lat_1=-36 +lat_2=-38 +x_0=2500000 +y_0=2500000 +ellps=GRS80 +step +proj=push +v_3 +step +proj=cart +ellps=GRS80 +step +proj=helmert +x=0.06155 +y=-0.01087 +z=-0.04019 +rx=-0.0394924 +ry=-0.0327221 +rz=-0.0328979 +s=-0.009994 +convention=coordinate_frame +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=lcc +lat_0=-37 +lon_0=145 +lat_1=-36 +lat_2=-38 +x_0=2500000 +y_0=2500000 +ellps=GRS80')
self.assertTrue(ops[op1_index].isAvailable)
self.assertEqual(ops[op1_index].accuracy, 0.01)
self.assertEqual(len(ops[op1_index].grids), 0)
#.........这里部分代码省略.........