I read that blog post. Such a good example. But there is even a comment in there warning about raster via database. I am going to try it out as well with some MODIS data. I wonder what needs to be done to make raster more performant in POSTGIS?
There's some work to be done to make all functions parallelizeable. After that it gets harder. For large scale raster analysis, moving the processing closer to the data becomes paramount. I feel like purpose-built raster processing will always be better. Maybe something with FDW or other client/service architecture, where the database sends off the request and the bulk processing happens close to the data. Also, the row-based model of SQL sort of breaks down against raster where the model expects much much larger objects and presenting the tiled-up model to users just adds complexity without getting back performance or flexibility in return.
