66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
from qgis.core import QgsApplication, QgsField, QgsProject, \
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QgsProcessingFeedback, QgsVectorLayer, QgsVectorDataProvider, \
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QgsExpressionContext, QgsExpressionContextUtils
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from qgis.analysis import QgsNativeAlgorithms
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import processing
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class ScrubLayer:
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def __init__(self, qgis_path, layer_path, layer_name):
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# Set the path to QGIS installation
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QgsApplication.setPrefixPath(qgis_path, True)
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# Initialize QGIS application
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qgs = QgsApplication([], False)
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qgs.initQgis()
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self.layer_path = layer_path
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self.layer_name = layer_name
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self.layer = self.load_layer()
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def load_layer(self):
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the_layer = QgsVectorLayer(self.layer_path, self.layer_name, 'ogr')
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if not the_layer.isValid():
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raise ValueError(f'Failed to load layer {self.layer_name} from {self.layer_path}')
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else:
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QgsProject.instance().addMapLayer(the_layer)
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return the_layer
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def fix_geometries(self, fixed_layer):
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QgsApplication.processingRegistry().addProvider(QgsNativeAlgorithms())
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fix_geometries_params = {
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'INPUT': self.layer,
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'METHOD': 0,
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'OUTPUT': fixed_layer
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}
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processing.run("native:fixgeometries", fix_geometries_params)
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def create_spatial_index(self):
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QgsApplication.processingRegistry().addProvider(QgsNativeAlgorithms())
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create_spatial_index_params = {
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'INPUT': self.layer,
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'OUTPUT': 'Output'
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}
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processing.run("native:createspatialindex", create_spatial_index_params)
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print(f'Creating spatial index for {self.layer_name} is completed.')
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def clip_layer(self, overlay_layer, clipped_layer):
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QgsApplication.processingRegistry().addProvider(QgsNativeAlgorithms())
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clip_layer_params = {
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'INPUT': self.layer_path,
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'OVERLAY': overlay_layer,
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'FILTER_EXPRESSION': '',
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'FILTER_EXTENT': None,
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'OUTPUT': clipped_layer
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}
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processing.run("native:clip", clip_layer_params)
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print(f'Clipping of {self.layer_name} is completed.')
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@staticmethod
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def cleanup():
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QgsApplication.exitQgis()
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