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Introduce a new filter, "filters.raster_overlay", to facilitate scenarios like masking water bodies with a raster. This filter should support options such as "filename", "dimension", "band_id", "gdalopts", "data_type", and "nodata".
`filters.dem` and `readers.gdal` aren't quite what you want in all situations. A common scenario is masking water bodies with a raster. `filters.colorization` is too dependent on Red, Green, Blue dimensions, and you have to `filters.ferry` data from them if you wanted to cobble something together. `filters.raster_overlay` could provide the following options: * filename * dimension * band_id * gdalopts * data_type * nodata