Grass_Raster_ImagePatchService - This service could be used to patch together adjacent map layers. It is useful for filling in "holes" in a raster map layer's data (e.g., in digital elevation data), or for updating an older map layer with more recent data.
Operations:
patch_grey - Makes a composite raster map layer from two or more adjacent map layers. patch_truecolor - Mosaics red, green, blue color channaels of 2 images, produce a truecolor composite.
