yutannihilation commented on PR #478:
URL: https://github.com/apache/sedona-db/pull/478#issuecomment-3708702799

   > The CRS of a geography can be any lon/lat CRS
   
   Thanks for clarifying. I mean, it definitely can be in theory, but I was 
wondering if the difference of CRSs is actually handled correctly by the 
underlying libraries. For example, it seems PostGIS's GEOGRAPHY assumes WGS84, 
and probably WGS84 is the only CRS that it can handle.
   
   > In order to load geometry data into a geography table, the geometry first 
needs to be projected into EPSG:4326 (longitude/latitude), then it needs to be 
changed into geography.
   https://postgis.net/workshops/en/postgis-intro/geography.html
   
   Anyway, probably this is a broader topic, so I don't want to discuss the 
details here. I'll study more about how other DBs handle GEOGRAPHY.


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