Thank you Jason but what you suggest, e.g. using a number of steps external to postgis is exactly what I want to avoid. In any case I have no problem creating the rasters in SAGA then using using raster2pgsql to import them. But since postgis has an st_asraster function that creates rasters natively within postgis from geometries, and since I have already imported the shape files as postgis vector, all I am looking for is a good tutorial to explain how to use st_asraster to achieve what raster2pgsql does.
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