使用PyQGIS从QgsVectorLayer的光栅化创建内存中的QgsRasterlayer的步骤如下:
from qgis.core import QgsVectorLayer, QgsRasterLayer, QgsProject, QgsRasterizeTask, QgsRasterizeTask QgsRasterizeTask
from PyQt5.QtCore import QFileInfo
vector_path = 'path_to_vector_layer.shp'
vector_layer = QgsVectorLayer(vector_path, 'vector_layer', 'ogr')
raster_path = 'path_to_raster_layer.tif'
raster_layer = QgsRasterLayer('crs=EPSG:4326&width=100&height=100&name=raster_layer&crsAuthId=EPSG:4326', 'raster_layer', 'memory')
renderer = raster_layer.renderer()
provider = raster_layer.dataProvider()
extent = vector_layer.extent()
width = raster_layer.width()
height = raster_layer.height()
crs = raster_layer.crs()
renderer.setExtent(extent)
renderer.setDestinationCrs(crs)
provider.setWidth(width)
provider.setHeight(height)
provider.setExtent(extent)
task = QgsRasterizeTask(vector_layer, raster_path, 'raster_field', width, height, extent, crs)
其中,'raster_field'是矢量图层中用于栅格化的字段名称。
task.run()
QgsProject.instance().addMapLayer(raster_layer)
完整的代码示例:
from qgis.core import QgsVectorLayer, QgsRasterLayer, QgsProject, QgsRasterizeTask
from PyQt5.QtCore import QFileInfo
# 加载矢量图层
vector_path = 'path_to_vector_layer.shp'
vector_layer = QgsVectorLayer(vector_path, 'vector_layer', 'ogr')
# 创建内存中的栅格图层
raster_path = 'path_to_raster_layer.tif'
raster_layer = QgsRasterLayer('crs=EPSG:4326&width=100&height=100&name=raster_layer&crsAuthId=EPSG:4326', 'raster_layer', 'memory')
# 设置栅格图层的渲染参数
renderer = raster_layer.renderer()
provider = raster_layer.dataProvider()
extent = vector_layer.extent()
width = raster_layer.width()
height = raster_layer.height()
crs = raster_layer.crs()
renderer.setExtent(extent)
renderer.setDestinationCrs(crs)
provider.setWidth(width)
provider.setHeight(height)
provider.setExtent(extent)
# 创建栅格化任务
task = QgsRasterizeTask(vector_layer, raster_path, 'raster_field', width, height, extent, crs)
# 执行栅格化任务
task.run()
# 将栅格图层添加到QGIS项目中
QgsProject.instance().addMapLayer(raster_layer)
这个过程中使用到的QGIS相关类和方法可以在QGIS官方文档中找到更详细的说明和用法。
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