Hi all, I have a use case which involves raster geometries. Naturally I would like to use Sedona for that.
The current raster functions operate on arrays of doubles. That means that all the spatial metadata is missing. That makes it impossible to implement anything like what Postgis has: https://postgis.net/docs/RT_reference.html Rasters have a position, srid, scale and other attributes that are needed for a lot of functions. If Sedona had a raster type we would have a foundation to build on. Then the community could add their favorite raster functions, just like with vector functions. The Sedona raster type could be serialized to "raster WKB" format. It's a format invented by Postgis and not an official standard. It just borrows the popular name of the proper WKB which is only for vector geometries. https://git.osgeo.org/gitea/postgis/postgis/src/branch/master/raster/doc/RFC2-WellKnownBinaryFormat There are several independent implementations of raster WKB in C, Rust, Python etc. But I haven't found a JVM implementation. We could implement a WKBGridCoverageReader and WKBGridCoverageWriter (implementing GridCoverageReader and GridCoverageWriter in geotools) and use GridCoverage in our functions. I haven't used raster geometries that much. There might be some better options. What are your thoughts? //Martin
