jenchu-igis-com-tw-esridist

Problem transformation raster

Discussion created by jenchu-igis-com-tw-esridist on Apr 21, 2011
I have a question for transformation raster.Like Accessories to show.I use C# program to build.The result for transformation raster have Offset,but I need is whole raster to coordinate transformation.Not raster to offset.

I use raster format is png.The file of .pgw is can't coordinate transformation.

Thanks for all


private void btnOpen_Click(object sender, EventArgs e)
        {
            openDialog();
            IRasterDataset2 rasDs2 = rasDs as IRasterDataset2;
            ISpatialReference SRf =MakeSpatialReference(esriSRProjCS3Type.esriSRProjCS_TWD1997TM_Taiwan);
            ProjectRasterWithDatumTransformation(rasDs2, SRf, (IGeoTransformation)transfomation());
        }

public static void ProjectRasterWithDatumTransformation(IRasterDataset2 rasterDataset, ISpatialReference outSR, IGeoTransformation geoTransformation)
        {
            //This example shows how to specify a datum transformation when projecting raster data.
            //rasterDataset�??Represents input of a raster dataset that has a known spatial reference.
            //outSR�??Represents the spatial reference of the output raster dataset.
            //geoTrans�??Represents the geotransformation between the input and output spatial reference.
            //Set output spatial reference.
           
            IRaster raster = rasterDataset.CreateFullRaster();
            IRasterProps rasterProps = (IRasterProps)raster;
            rasterProps.SpatialReference = outSR;

            //Specify the geotransformation.
            ISpatialReferenceFactory2 srFactory = new SpatialReferenceEnvironmentClass();
            //IGeoTransformation geoTransformation = (IGeoTransformation)
            //    srFactory.CreateGeoTransformation((int)geoTrans);

            //Add to the geotransformation operation set.
            IGeoTransformationOperationSet operationSet = new GeoTransformationOperationSetClass();
            operationSet.Set(esriTransformDirection.esriTransformForward, geoTransformation);
            operationSet.Set(esriTransformDirection.esriTransformReverse, geoTransformation);

            //Set the geotransformation on the raster.
            IRaster2 raster2 = (IRaster2)raster;
            raster2.GeoTransformations = operationSet;

            //Save the result.
            IWorkspaceFactory wsfactory = new RasterWorkspaceFactory();
            IWorkspace outputWorkspace = wsfactory.OpenFromFile(@"c:\output", 0);

            ISaveAs saveas = (ISaveAs)raster;
            saveas.SaveAs("test5.png", outputWorkspace, "PNG");
        }

        private ICoordinateFrameTransformation transfomation()
        {
            Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
            System.Object obj = Activator.CreateInstance(factoryType);
            ISpatialReferenceFactory2 pSRF = obj as ISpatialReferenceFactory2;
           

            // Initialize and create the input and output coordinate systems.
            IProjectedCoordinateSystem2 pPCSin = new ESRI.ArcGIS.Geometry.ProjectedCoordinateSystemClass();
            IProjectedCoordinateSystem2 pPCSout = new ESRI.ArcGIS.Geometry.ProjectedCoordinateSystemClass();
           
            pPCSin = (IProjectedCoordinateSystem2)pSRF.CreateProjectedCoordinateSystem((int)
           esriSRProjCS3Type.esriSRProjCS_TWD1997TM_Taiwan);
           
            pPCSout = (IProjectedCoordinateSystem2)pSRF.CreateProjectedCoordinateSystem((int)
             esriSRProjCS3Type.esriSRProjCS_TWD1967TM_Taiwan);


            //IGeographicCoordinateSystem2 pGCSto;
            //IGeographicCoordinateSystem2 pGCSfrom;
            // Retrieve the geographic coordinate systems from the
            // two projected coordinate systems
            //pGCSfrom = (IGeographicCoordinateSystem2)pPCSin.GeographicCoordinateSystem;
            //pGCSto = (IGeographicCoordinateSystem2)pPCSout.GeographicCoordinateSystem;

            // Initialize and create an appropriate geographic transformation.
            ICoordinateFrameTransformation pCFT = new CoordinateFrameTransformationClass();
            pCFT.PutParameters(730.160, 346.212, 472.186, 7.968009465325332199694565793688, 3.5498173155125282722429064796627, 0.40634166830677981965825251394163, 0.99998180);
            pCFT.PutSpatialReferences(pPCSin, pPCSout);
            pCFT.Name = "97-67";

            return pCFT;
        }
public ISpatialReference MakeSpatialReference(ESRI.ArcGIS.Geometry.esriSRProjCS3Type coordinateSystem)
        {

            ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();

            //Create a projected coordinate system and define its domain, resolution, and x,y tolerance.
            ISpatialReferenceResolution spatialReferenceResolution = spatialReferenceFactory.CreateProjectedCoordinateSystem(System.Convert.ToInt32(coordinateSystem)) as ISpatialReferenceResolution;
            spatialReferenceResolution.ConstructFromHorizon();
           
            ISpatialReferenceTolerance spatialReferenceTolerance = spatialReferenceResolution as ISpatialReferenceTolerance;
            spatialReferenceTolerance.SetDefaultXYTolerance();
           
            ISpatialReference spatialReference = spatialReferenceResolution as ISpatialReference;

            return spatialReference;

        }

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