矢量裁剪栅格（过滤）（c#）

最新推荐文章于 2023-01-05 18:58:45 发布

转载最新推荐文章于 2023-01-05 18:58:45 发布 · 317 阅读

文章标签：

本文介绍了一种使用ClipFilter类从矢量形状文件中读取几何对象，并将其应用于栅格数据的方法。通过遍历要素类获取每个要素的几何形状，然后将这些几何形状添加到ClipFilter实例中。此外，还介绍了如何设置输出属性，包括当输出为非地理数据库格式时调整像素深度和定义NoData值。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

IClipFilter clipRaster = new ClipFilterClass();

      //Add the polygons from the shapefile to the clip filer
      IGeometry clipGeometry;
      IFeature feature;
      for (int i = 0; i <= featureClass.FeatureCount(null) - 1; i++)
      {
        feature = featureClass.GetFeature(i);
        clipGeometry = (IGeometry)feature.Shape;
        clipRaster.Add(clipGeometry);
      }

      //Set the filter to the raster
      IPixelOperation pixelOp = (IPixelOperation)raster;
      pixelOp.PixelFilter = (IPixelFilter)clipRaster;

      //Now we need to specify properties for the output. The output can
      //be a file format or a geodatabase. This sample supports output
      //to File geodatabase and Personal Geodatabase.
      //If the output is a file format and input raster does not contain NoData and the max value
      //of the pixel depth is being used. (For example 255 is used for
      //8 bit unsigned case), output pixel depth needs to be promoted and NoData
      //value need to set up properly.

      IWorkspace workSpace = openWorkspace(outputFolder);
      IRasterProps rasterProps = (IRasterProps)raster;

      if (workSpace.PathName.Contains(".gdb") == false)
      {
        rasterProps.NoDataValue = 256;
        rasterProps.PixelType = rstPixelType.PT_USHORT;
      }

      //Save the result out
      ISaveAs saveas = (ISaveAs)raster;
      saveas.SaveAs(outputFile, workSpace, Format);