WorldToRasterCoord Class Reference

Inheritance diagram for WorldToRasterCoord:

Collaboration diagram for WorldToRasterCoord:

Public Member Functions
String	getURI ()
Geometry	attribute (GridCoverage raster, Integer longitude, Integer latitude)
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Member Function Documentation

attribute()

Geometry attribute	(	GridCoverage	raster,
		Integer	longitude,
		Integer	latitude
	)

Reimplemented from RasterAttributeIntIntGeomFunction.

                                                                                          {
        try {
                
         GridGeometry gg2D = raster.getGridGeometry();
            MathTransform gridToCRS = gg2D.getGridToCRS(PixelInCell.CELL_CENTER);
            MathTransform crsToGrid = gridToCRS.inverse();
            DirectPosition realPos=new DirectPosition2D(latitude, longitude);
            DirectPosition gridPos = new DirectPosition2D();
            DirectPosition res=crsToGrid.transform(realPos, gridPos);
            Coordinate coord=new Coordinate(res.getCoordinate()[0],res.getCoordinate()[1]);
            GeometryFactory fac=new GeometryFactory();
            return fac.createPoint(coord);
       } catch (TransformException e) {
           return null;
       }
        }

evaluate()

Value evaluate ( ValueFactory  valueFactory, Value...  args  ) throws ValueExprEvaluationException

inherited

                                                                                                            {
                if (args.length != 3) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 1 arguments, got " + args.length);
                }
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof RasterLiteral) {
                        GridCoverage geom=((RasterLiteral)l).read(args[0].stringValue());
                        Integer longitude = Integer.valueOf(args[1].stringValue());
                        Integer latitude = Integer.valueOf(args[2].stringValue());
                        Geometry result = attribute(geom,longitude,latitude);
                        return valueFactory.createLiteral(((VectorLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                return null;
        }

References RasterAttributeIntIntGeomFunction.attribute(), and LiteralRegistry.getLiteral().

Referenced by RasterToWorldCoordTest.testRasterToWorldCoord(), and WorldToRasterCoordTest.testWorldToRasterCoord().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_worldToRasterCoord.stringValue();
        }

References POSTGIS.st_worldToRasterCoord.