Drabble opened a new pull request, #861:
URL: https://github.com/apache/incubator-baremaps/pull/861

   According to the GeoParquet specification, the default CRS can be null and 
should default to [OGC:CRS84](https://www.opengis.net/def/crs/OGC/1.3/CRS84).
   
   > [PROJJSON](https://proj.org/specifications/projjson.html) object 
representing the Coordinate Reference System (CRS) of the geometry. If the 
field is not provided, the default CRS is 
[OGC:CRS84](https://www.opengis.net/def/crs/OGC/1.3/CRS84), which means the 
data in this column must be stored in longitude, latitude based on the WGS84 
datum.
   
   
https://github.com/opengeospatial/geoparquet/blob/main/format-specs/geoparquet.md#column-metadata
   
   


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