本文整理汇总了Python中qgis.core.QgsCoordinateReferenceSystem.srsid方法的典型用法代码示例。如果您正苦于以下问题:Python QgsCoordinateReferenceSystem.srsid方法的具体用法?Python QgsCoordinateReferenceSystem.srsid怎么用?Python QgsCoordinateReferenceSystem.srsid使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsCoordinateReferenceSystem
的用法示例。
在下文中一共展示了QgsCoordinateReferenceSystem.srsid方法的4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: test_ExpressionFieldEllipsoidLengthCalculation
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import srsid [as 别名]
def test_ExpressionFieldEllipsoidLengthCalculation(self):
#create a temporary layer
temp_layer = QgsVectorLayer("LineString?crs=epsg:3111&field=pk:int", "vl", "memory")
self.assertTrue(temp_layer.isValid())
f1 = QgsFeature(temp_layer.dataProvider().fields(), 1)
f1.setAttribute("pk", 1)
f1.setGeometry(QgsGeometry.fromPolyline([QgsPoint(2484588, 2425722), QgsPoint(2482767, 2398853)]))
temp_layer.dataProvider().addFeatures([f1])
# set project CRS and ellipsoid
srs = QgsCoordinateReferenceSystem(3111, QgsCoordinateReferenceSystem.EpsgCrsId)
QgsProject.instance().writeEntry("SpatialRefSys", "/ProjectCRSProj4String", srs.toProj4())
QgsProject.instance().writeEntry("SpatialRefSys", "/ProjectCRSID", srs.srsid())
QgsProject.instance().writeEntry("SpatialRefSys", "/ProjectCrs", srs.authid())
QgsProject.instance().writeEntry("Measure", "/Ellipsoid", "WGS84")
QgsProject.instance().writeEntry("Measurement", "/DistanceUnits", QgsUnitTypes.encodeUnit(QGis.Meters))
idx = temp_layer.addExpressionField('$length', QgsField('length', QVariant.Double)) # NOQA
# check value
f = temp_layer.getFeatures().next()
expected = 26932.156
self.assertAlmostEqual(f['length'], expected, 3)
# change project length unit, check calculation respects unit
QgsProject.instance().writeEntry("Measurement", "/DistanceUnits", QgsUnitTypes.encodeUnit(QGis.Feet))
f = temp_layer.getFeatures().next()
expected = 88360.0918635
self.assertAlmostEqual(f['length'], expected, 3)
示例2: test_ExpressionFieldEllipsoidAreaCalculation
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import srsid [as 别名]
def test_ExpressionFieldEllipsoidAreaCalculation(self):
#create a temporary layer
temp_layer = QgsVectorLayer("Polygon?crs=epsg:3111&field=pk:int", "vl", "memory")
self.assertTrue(temp_layer.isValid())
f1 = QgsFeature(temp_layer.dataProvider().fields(), 1)
f1.setAttribute("pk", 1)
f1.setGeometry(QgsGeometry.fromPolygon([[QgsPoint(2484588, 2425722), QgsPoint(2482767, 2398853), QgsPoint(2520109, 2397715), QgsPoint(2520792, 2425494), QgsPoint(2484588, 2425722)]]))
temp_layer.dataProvider().addFeatures([f1])
# set project CRS and ellipsoid
srs = QgsCoordinateReferenceSystem(3111, QgsCoordinateReferenceSystem.EpsgCrsId)
QgsProject.instance().writeEntry("SpatialRefSys", "/ProjectCRSProj4String", srs.toProj4())
QgsProject.instance().writeEntry("SpatialRefSys", "/ProjectCRSID", srs.srsid())
QgsProject.instance().writeEntry("SpatialRefSys", "/ProjectCrs", srs.authid())
QgsProject.instance().writeEntry("Measure", "/Ellipsoid", "WGS84")
QgsProject.instance().writeEntry("Measurement", "/AreaUnits", QgsUnitTypes.encodeUnit(QgsUnitTypes.SquareMeters))
idx = temp_layer.addExpressionField('$area', QgsField('area', QVariant.Double)) # NOQA
# check value
f = temp_layer.getFeatures().next()
expected = 1009089817.0
self.assertAlmostEqual(f['area'], expected, delta=1.0)
# change project area unit, check calculation respects unit
QgsProject.instance().writeEntry("Measurement", "/AreaUnits", QgsUnitTypes.encodeUnit(QgsUnitTypes.SquareMiles))
f = temp_layer.getFeatures().next()
expected = 389.6117565069
self.assertAlmostEqual(f['area'], expected, 3)
示例3: testCrs
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import srsid [as 别名]
def testCrs(self):
# test setting/getting the source CRS
da = QgsDistanceArea()
# try setting using a CRS object
crs = QgsCoordinateReferenceSystem(3111, QgsCoordinateReferenceSystem.EpsgCrsId)
da.setSourceCrs(crs, QgsProject.instance().transformContext())
self.assertEqual(da.sourceCrs().srsid(), crs.srsid())
示例4: testCrs
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import srsid [as 别名]
def testCrs(self):
# test setting/getting the source CRS
da = QgsDistanceArea()
# try setting using a crs id
da.setSourceCrs(3452)
self.assertEqual(da.sourceCrsId(), 3452)
# try setting using a CRS object
crs = QgsCoordinateReferenceSystem(3111, QgsCoordinateReferenceSystem.EpsgCrsId)
da.setSourceCrs(crs)
self.assertEqual(da.sourceCrsId(), crs.srsid())