public void DisposeSurface()
{
if (_rasterSurface == null)
{
return;
}
_msg.Debug("Disposing raster");
_rasterSurface.Dispose();
_rasterSurface = null;
IWorkspace memoryWs = null;
if (_memoryRasterDataset != null)
{
memoryWs = _memoryRasterDataset.Workspace;
_memoryRasterDataset.Delete();
ComUtils.ReleaseComObject(_memoryRasterDataset);
_memoryRasterDataset = null;
}
if (memoryWs != null)
{
((IDataset)memoryWs).Delete();
ComUtils.ReleaseComObject(memoryWs);
}
}
public void DisposeSurface()
{
if (_tinSurface == null)
{
return;
}
_msg.Debug("Disposing tin");
_tinSurface.Dispose();
_tinSurface = null;
}
private ISimpleSurface GetRasterSurface(
[NotNull] IRaster sourceRaster,
[NotNull] IEnvelope box,
[CanBeNull] out IDataset memoryRasterDataset)
{
// Remark:
// surface values outside 'raster'.envelope (but within 'box') are 0
Assert.ArgumentNotNull(sourceRaster, nameof(sourceRaster));
Assert.ArgumentNotNull(box, nameof(box));
IRasterFunction rasterFunction = new ClipFunctionClass();
IClipFunctionArguments functionArguments = new ClipFunctionArgumentsClass();
functionArguments.Raster = sourceRaster;
IEnvelope clipBox = GetClipBox(box, sourceRaster);
functionArguments.Extent = clipBox;
functionArguments.ClippingGeometry = clipBox;
functionArguments.ClippingType = esriRasterClippingType.esriRasterClippingOutside;
IFunctionRasterDataset functionRasterDataset = new FunctionRasterDataset();
functionRasterDataset.Init(rasterFunction, functionArguments);
functionRasterDataset.RasterInfo.NoData = (float)-9999;
// unsicher, wie die memory verwaltung ist
// zum sicherstellen der memory-verwaltung
// --> inmemory raster erstellen
var save = (ISaveAs2)functionRasterDataset;
IWorkspaceName wsName = WorkspaceUtils.CreateInMemoryWorkspace("raster");
var ws = (IWorkspace)((IName)wsName).Open();
save.SaveAs("clipped", ws, "MEM");
IRasterDataset rasterDataset = ((IRasterWorkspace2)ws).OpenRasterDataset("clipped");
IRaster rasterData = rasterDataset.CreateDefaultRaster();
// Problems and workarounds for raster(-mosaic) data in surfaces
// -------------------------------------------------------------
//
// Extent completly within footprint of mosaic dataset: -> no NoDataValues -> no problems
// Extent partly within footprint of mosaic dataset : -> double.NaN returned for values outside footprint -> no problems (TODO: verifiy)
// Extent completely outside footprint of mosaic dataset, but within extent of mosaic data set:
// 0-values returned for Null-raster values
// workaround: ((IRasterProps) rasterData).NoDataValue = (float)0; works, if ((IRasterProps) raster).NoDataValue = null and no Height == 0
// workaround to test: use CustomPixelFilter (see https://github.com/Esri/arcobjects-sdk-community-samples/tree/master/Net/Raster/CustomNodataFilter/CSharp
// Extent completely outside extent of mosaic dataset
// 0-values returned for Null-raster values, rasterData.Height = 1, rasterData.Width = 1
// workaround 1: use custom RasterSurface class.
// workaround 2: ((IRasterProps) rasterData).NoDataValue = (float)0; works, if ((IRasterProps) raster).NoDataValue = null and no Height == 0
memoryRasterDataset = (IDataset)rasterDataset;
ISimpleSurface rasterSurface = RasterReference.CreateSurface(rasterData);
return(rasterSurface);
}