Whenever I change a couple of cells in an existing raster map, I have to create a new raster map and patch the old and new maps, which can take long because r.patch has to read and write the entire map.
There are Rast_open_old/new, but no Rast_open_update and AFAIK there are no raster modules that directly update existing raster maps. I don't know why. I thought it would be great if there was Rast_open_update so we can update existing raster maps without creating a temp map and patching it.
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