How to perform geodata transformation on a raster

Summary This document shows how to set a transformation on a raster.

Performing geodata transformation on a raster

A geodata transformation is a mathematical model that performs geometric transformation on a raster. The geodata transformation consists of many concrete classes such as, PolynomialXform, RPCXform, AdjustXform, and so on.

To perform geodata transformation on a raster, you need to set it on the raster first, then set the output extent and cell size. See the following:

[Java]


        static void setGeodataXformAndSaveAs(IRaster2 raster, IGeodataXform xform)throws
    Exception{
    //Get the original extent and cell size of the raster.
    IRasterProps rasterProp = (IRasterProps)raster;
    IEnvelope extent = rasterProp.getExtent();
    IPnt cellSize = rasterProp.meanCellSize();
    double[] xCell = {
        cellSize.getX()
    };
    double[] yCell = {
        cellSize.getY()
    };

    //Set the xform on the raster.
    raster.setGeodataXform(xform);

    //Transform the cell size first, then the extent; the sequence matters.
    xform.transformCellsize(esriTransformDirection.esriTransformForward, xCell,
        yCell, extent);
    xform.transformExtent(esriTransformDirection.esriTransformForward, extent);

    //Put the transformed extent and cell size on the raster and save as.
    rasterProp.setExtent(extent);
    rasterProp.setWidth((int)(extent.getWidth() / xCell[0]));
    rasterProp.setHeight((int)(extent.getHeight() / yCell[0]));

    //Save the raster.
    ISaveAs saveAs = new ISaveAsProxy(raster);
    saveAs.saveAs("c:/temp/image1.img", null, "IMAGINE Image");
}

Development licensing	Deployment licensing
ArcView	ArcView
ArcEditor	ArcEditor
ArcInfo	ArcInfo
Engine Developer Kit	Engine Runtime