Hello. I can't find any information about the using mask bands in virtual datasets of Gdal (*.vrt files). I wan't to mask region in my source dataset.
For example, I have the Earth map in Plate Carree projection. Map resolution is 1000x500 pixels. I want to define a valid area inside the rectangle: x = 400, y = 200, width = 100, height = 50, and reproject all map to another projection. I found this article: http://www.gdal.org/gdal_vrttut.html, that says that I should use the <MaskBand> options. I wrote a vrt file: <VRTDataset rasterXSize="1000" rasterYSize="500"> <SRS>GEOGCS[...]</SRS> <GeoTransform>...</GeoTransform> <VRTRasterBand dataType="Byte" band="1"> ... </VRTRasterBand> <VRTRasterBand dataType="Byte" band="2"> ... </VRTRasterBand> <VRTRasterBand dataType="Byte" band="3"> ... </VRTRasterBand> <MaskBand> <VRTRasterBand dataType="Byte"> <SimpleSource> <SourceFilename relativeToVRT="1">plate.png</SourceFilename> <SourceBand>mask,1</SourceBand> <SrcRect xOff="0" yOff="0" xSize="1000" ySize="500" /> <DstRect xOff="0" yOff="0" xSize="1000" ySize="500" /> </SimpleSource> </VRTRasterBand> </MaskBand> </VRTDataset> What does it mean?: <SrcRect xOff="0" yOff="0" xSize="1000" ySize="500" /> <DstRect xOff="0" yOff="0" xSize="1000" ySize="500" /> What I should past to this parameters? If I write <SrcRect xOff="400" yOff="200" xSize="100" ySize="50" /> I got unexpected results. -- View this message in context: http://osgeo-org.1560.n6.nabble.com/MaskBand-MaskBand-Usage-in-vrt-files-tp4909325p4909325.html Sent from the GDAL - Dev mailing list archive at Nabble.com. _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
