本文整理汇总了Python中qgis.core.QgsCoordinateReferenceSystem.validSrsIds方法的典型用法代码示例。如果您正苦于以下问题：Python QgsCoordinateReferenceSystem.validSrsIds方法的具体用法？Python QgsCoordinateReferenceSystem.validSrsIds怎么用？Python QgsCoordinateReferenceSystem.validSrsIds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.validSrsIds方法的2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: processAlgorithm
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import validSrsIds [as 别名]
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
extent = self.parameterAsExtent(parameters, self.TARGET_AREA, context)
target_crs = self.parameterAsCrs(parameters, self.TARGET_AREA_CRS, context)
target_geom = QgsGeometry.fromRect(extent)
fields = QgsFields()
fields.append(QgsField('auth_id', QVariant.String, '', 20))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.NoGeometry, QgsCoordinateReferenceSystem())
# make intersection tests nice and fast
engine = QgsGeometry.createGeometryEngine(target_geom.constGet())
engine.prepareGeometry()
layer_bounds = QgsGeometry.fromRect(source.sourceExtent())
crses_to_check = QgsCoordinateReferenceSystem.validSrsIds()
total = 100.0 / len(crses_to_check)
found_results = 0
transform_context = QgsCoordinateTransformContext()
for current, srs_id in enumerate(crses_to_check):
if feedback.isCanceled():
break
candidate_crs = QgsCoordinateReferenceSystem.fromSrsId(srs_id)
if not candidate_crs.isValid():
continue
transform_candidate = QgsCoordinateTransform(candidate_crs, target_crs, transform_context)
transformed_bounds = QgsGeometry(layer_bounds)
try:
if not transformed_bounds.transform(transform_candidate) == 0:
continue
except:
continue
try:
if engine.intersects(transformed_bounds.constGet()):
feedback.pushInfo(self.tr('Found candidate CRS: {}').format(candidate_crs.authid()))
f = QgsFeature(fields)
f.setAttributes([candidate_crs.authid()])
sink.addFeature(f, QgsFeatureSink.FastInsert)
found_results += 1
except:
continue
feedback.setProgress(int(current * total))
if found_results == 0:
feedback.reportError(self.tr('No matching projections found'))
return {self.OUTPUT: dest_id}示例2: processAlgorithm
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import validSrsIds [as 别名]
def processAlgorithm(self, parameters, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
extent = self.getParameterValue(self.TARGET_AREA).split(',')
if not extent:
extent = QgsProcessingUtils.combineLayerExtents([layer])
target_crs = QgsCoordinateReferenceSystem(self.getParameterValue(self.TARGET_AREA_CRS))
target_geom = QgsGeometry.fromRect(QgsRectangle(float(extent[0]), float(extent[2]),
float(extent[1]), float(extent[3])))
output_file = self.getOutputValue(self.OUTPUT_HTML_FILE)
# make intersection tests nice and fast
engine = QgsGeometry.createGeometryEngine(target_geom.geometry())
engine.prepareGeometry()
layer_bounds = QgsGeometry.fromRect(layer.extent())
results = []
for srs_id in QgsCoordinateReferenceSystem.validSrsIds():
candidate_crs = QgsCoordinateReferenceSystem.fromSrsId(srs_id)
if not candidate_crs.isValid():
continue
transform_candidate = QgsCoordinateTransform(candidate_crs, target_crs)
transformed_bounds = QgsGeometry(layer_bounds)
try:
if not transformed_bounds.transform(transform_candidate) == 0:
continue
except:
continue
if engine.intersects(transformed_bounds.geometry()):
results.append(candidate_crs.authid())
self.createHTML(output_file, results)