//裁剪
private IRaster ShpLayerClipRaster(IFeatureLayer featureLayer, IRaster raster)
{
IFeatureLayer pFeaLyr;
IRasterAnalysisEnvironment pEnv;
IGeoDataset pTempDS;
pFeaLyr = featureLayer;
pTempDS = pFeaLyr.FeatureClass as IGeoDataset;
IConversionOp pConOp = new RasterConversionOpClass();
pEnv = pConOp as IRasterAnalysisEnvironment;
IRasterProps pProp = raster as IRasterProps;
object cellSize = 0.01;
pEnv.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue, ref cellSize);
IRasterConvertHelper rsh = new RasterConvertHelperClass();
IRaster tempRaster = rsh.ToRaster1(pTempDS, "Grid", pEnv);
IRaster pOutRaster;
IExtractionOp pExtrOp = new RasterExtractionOpClass();
pOutRaster = (IRaster)pExtrOp.Raster((IGeoDataset)raster, (IGeoDataset)tempRaster);
return(pOutRaster);
}
internal static RasterExtractionResult SummariseRaster(IGeoDataset pClippingPolygon, ExtractionLayerConfig pExtractionLayerConfig)
{
// set the analysis extent to be that of the polygon
ServerLogger logger = new ServerLogger();
logger.LogMessage(ServerLogger.msgType.debug, "SummariseCategoricalRaster", 99, "Categorical raster clip beginning..");
IEnvelope tAnalysisExtent = pClippingPolygon.Extent;
bool pCategoricalSummary = pExtractionLayerConfig.ExtractionType == ExtractionTypes.CategoricalRaster;
IGeoDataset pRasterToClip = pExtractionLayerConfig.LayerDataset;
IRasterAnalysisEnvironment tRasterAnalysisEnvironment = new RasterAnalysisClass();
object tAnalysisEnvelopeCastToObject = (System.Object)tAnalysisExtent;
// object tAnotherBizarreMissingObject = Type.Missing;
object tSnapObject = (System.Object)pRasterToClip;
tRasterAnalysisEnvironment.SetExtent(esriRasterEnvSettingEnum.esriRasterEnvValue,
ref tAnalysisEnvelopeCastToObject, ref tSnapObject);
tRasterAnalysisEnvironment.SetAsNewDefaultEnvironment();
// extract the subset of the raster
IExtractionOp2 tExtractionOp = new RasterExtractionOpClass();
// note we want to base the extraction on a raster (in an IGeoDataset) rather than an IPolygon.
// That's because the catchment polygon may be multipart, and the operation doesn't work with multipart.
// Also the polygon has a max of 1000 vertices.
// And raster mask extraction is probably faster since the
// polygon is converted internally to a grid anyway.
IGeoDataset tClipped;
if (pRasterToClip as IRaster != null)
{
logger.LogMessage(ServerLogger.msgType.debug, "SummariseRaster", 99,
"Input was in raster form, using directly to clip...");
tClipped = tExtractionOp.Raster(pRasterToClip, pClippingPolygon);
}
else
{
// POLYGON VERSION: tExtractionOp.Polygon(pClipRaster,pPolygon,true)
// sometimes we need to be able to pass in a polygon but rather than using the polygon
// method we'll manually convert to a mask raster to avoid the issues above
// It would save work to do this once for each request rather than repeat the conversion
// for each layer - but we might want a different environment (snap extent etc) for each.
logger.LogMessage(ServerLogger.msgType.debug, "SummariseCategoricalRaster", 99,
"Converting input polygon to mask raster for clip...");
IRasterConvertHelper tConvertPolygonToRaster = new RasterConvertHelperClass();
// convert it to a raster with the same cell size as the input
IRasterProps tRst = pRasterToClip as IRasterProps;
IPnt tRstCellSize = tRst.MeanCellSize();
double x = tRstCellSize.X;
double y = tRstCellSize.Y;
double cellSize = Math.Round(Math.Min(x, y), 0);
object tCellSizeAsObjectForNoGoodReason = (System.Object)cellSize;
tRasterAnalysisEnvironment.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue,
ref tCellSizeAsObjectForNoGoodReason);
IGeoDataset tPolyAsRast =
tConvertPolygonToRaster.ToRaster1(pRasterToClip, "GRID", tRasterAnalysisEnvironment)
as IGeoDataset;
logger.LogMessage(ServerLogger.msgType.debug, "SummariseCategoricalRaster", 99,
"...done, proceeding with clip");
tClipped = tExtractionOp.Raster(pRasterToClip, tPolyAsRast);
}
// now we have the clipped raster we need to summarise it differently depending on whether
// we want a summary by category/value (for categorical rasters) or by stats (for float rasters)
Dictionary <string, double> tResults;
if (pCategoricalSummary)
{
tResults = WatershedDetailExtraction.SummariseRasterCategorically(tClipped);
if (tResults.Count > 100)
{
// sanity check: don't sum up more than 100 different values
tResults = WatershedDetailExtraction.SummariseRasterStatistically(tClipped);
pCategoricalSummary = false;
}
}
else
{
tResults = WatershedDetailExtraction.SummariseRasterStatistically(tClipped);
}
tRasterAnalysisEnvironment.RestoreToPreviousDefaultEnvironment();
return(new RasterExtractionResult(pExtractionLayerConfig.ParamName, pCategoricalSummary, tResults));
//return tResults;
}
internal static RasterExtractionResult SummariseRaster(IGeoDataset pClippingPolygon, ExtractionLayerConfig pExtractionLayerConfig)
{
// set the analysis extent to be that of the polygon
ServerLogger logger = new ServerLogger();
logger.LogMessage(ServerLogger.msgType.debug, "SummariseCategoricalRaster", 99, "Categorical raster clip beginning..");
IEnvelope tAnalysisExtent = pClippingPolygon.Extent;
bool pCategoricalSummary = pExtractionLayerConfig.ExtractionType==ExtractionTypes.CategoricalRaster;
IGeoDataset pRasterToClip = pExtractionLayerConfig.LayerDataset;
IRasterAnalysisEnvironment tRasterAnalysisEnvironment = new RasterAnalysisClass();
object tAnalysisEnvelopeCastToObject = (System.Object)tAnalysisExtent;
// object tAnotherBizarreMissingObject = Type.Missing;
object tSnapObject = (System.Object)pRasterToClip;
tRasterAnalysisEnvironment.SetExtent(esriRasterEnvSettingEnum.esriRasterEnvValue,
ref tAnalysisEnvelopeCastToObject, ref tSnapObject);
tRasterAnalysisEnvironment.SetAsNewDefaultEnvironment();
// extract the subset of the raster
IExtractionOp2 tExtractionOp = new RasterExtractionOpClass();
// note we want to base the extraction on a raster (in an IGeoDataset) rather than an IPolygon.
// That's because the catchment polygon may be multipart, and the operation doesn't work with multipart.
// Also the polygon has a max of 1000 vertices.
// And raster mask extraction is probably faster since the
// polygon is converted internally to a grid anyway.
IGeoDataset tClipped;
if (pRasterToClip as IRaster != null)
{
logger.LogMessage(ServerLogger.msgType.debug, "SummariseRaster", 99,
"Input was in raster form, using directly to clip...");
tClipped = tExtractionOp.Raster(pRasterToClip, pClippingPolygon);
}
else
{
// POLYGON VERSION: tExtractionOp.Polygon(pClipRaster,pPolygon,true)
// sometimes we need to be able to pass in a polygon but rather than using the polygon
// method we'll manually convert to a mask raster to avoid the issues above
// It would save work to do this once for each request rather than repeat the conversion
// for each layer - but we might want a different environment (snap extent etc) for each.
logger.LogMessage(ServerLogger.msgType.debug, "SummariseCategoricalRaster", 99,
"Converting input polygon to mask raster for clip...");
IRasterConvertHelper tConvertPolygonToRaster = new RasterConvertHelperClass();
// convert it to a raster with the same cell size as the input
IRasterProps tRst = pRasterToClip as IRasterProps;
IPnt tRstCellSize = tRst.MeanCellSize();
double x = tRstCellSize.X;
double y = tRstCellSize.Y;
double cellSize = Math.Round(Math.Min(x, y), 0);
object tCellSizeAsObjectForNoGoodReason = (System.Object)cellSize;
tRasterAnalysisEnvironment.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue,
ref tCellSizeAsObjectForNoGoodReason);
IGeoDataset tPolyAsRast =
tConvertPolygonToRaster.ToRaster1(pRasterToClip, "GRID", tRasterAnalysisEnvironment)
as IGeoDataset;
logger.LogMessage(ServerLogger.msgType.debug, "SummariseCategoricalRaster", 99,
"...done, proceeding with clip");
tClipped = tExtractionOp.Raster(pRasterToClip, tPolyAsRast);
}
// now we have the clipped raster we need to summarise it differently depending on whether
// we want a summary by category/value (for categorical rasters) or by stats (for float rasters)
Dictionary<string, double> tResults;
if (pCategoricalSummary)
{
tResults = WatershedDetailExtraction.SummariseRasterCategorically(tClipped);
if (tResults.Count > 100)
{
// sanity check: don't sum up more than 100 different values
tResults = WatershedDetailExtraction.SummariseRasterStatistically(tClipped);
pCategoricalSummary = false;
}
}
else
{
tResults = WatershedDetailExtraction.SummariseRasterStatistically(tClipped);
}
tRasterAnalysisEnvironment.RestoreToPreviousDefaultEnvironment();
return new RasterExtractionResult(pExtractionLayerConfig.ParamName, pCategoricalSummary, tResults);
//return tResults;
}