本文整理汇总了Python中qgis.core.QgsRasterPipe.insert方法的典型用法代码示例。如果您正苦于以下问题:Python QgsRasterPipe.insert方法的具体用法?Python QgsRasterPipe.insert怎么用?Python QgsRasterPipe.insert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.QgsRasterPipe
的用法示例。
在下文中一共展示了QgsRasterPipe.insert方法的1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: exportRasterLayer
# 需要导入模块: from qgis.core import QgsRasterPipe [as 别名]
# 或者: from qgis.core.QgsRasterPipe import insert [as 别名]
def exportRasterLayer(self, layer, destinationFile, options=None):
outputFormat = self.settings['rasterFormat'] if 'rasterFormat' in self.settings else 'GTiff'
if os.path.splitext(destinationFile)[1] == '':
formats = QgsRasterFileWriter.extensionsForFormat(outputFormat)
if len(formats) > 0:
destinationFile = '{}.{}'.format(destinationFile, formats[0])
provider = layer.dataProvider()
cols = provider.xSize()
rows = provider.ySize()
if not provider.capabilities() & QgsRasterDataProvider.Size:
k = float(provider.extent().width()) / float(provider.extent().height())
cols = RASTER_SIZE * k
rows = RASTER_SIZE
pipe = QgsRasterPipe()
if not pipe.set(provider.clone()):
QgsMessageLog.logMessage(self.tr('Failed to export layer "{layer}": Cannot set pipe provider.'.format(layer=layer.name())), 'QConsolidate', Qgis.Warning)
return False, None
nodata = {}
for i in range(1, provider.bandCount() + 1):
if provider.sourceHasNoDataValue(i):
value = provider.sourceNoDataValue(i)
nodata[i] = QgsRasterRange(value, value)
nuller = QgsRasterNuller()
for band, value in nodata.items():
nuller.setNoData(band, [value])
if not pipe.insert(1, nuller):
QgsMessageLog.logMessage(self.tr('Failed to export layer "{layer}": Cannot set pipe nuller.'.format(layer=layer.name())), 'QConsolidate', Qgis.Warning)
return False, None
writer = QgsRasterFileWriter(destinationFile)
writer.setOutputFormat(outputFormat)
if options is not None:
writer.setCreateOptions(options)
success = True
error = writer.writeRaster(pipe, cols, rows, provider.extent(), provider.crs())
if error != QgsRasterFileWriter.NoError:
QgsMessageLog.logMessage(self.tr('Failed to export layer "{layer}": {message}.'.format(layer=layer.name(), message=error)), 'QConsolidate', Qgis.Warning)
success = False
return success, destinationFile