mkaravel commented on code in PR #560: URL: https://github.com/apache/parquet-format/pull/560#discussion_r3028336001
########## Geospatial.md: ########## @@ -44,8 +44,57 @@ locations on Earth. The default CRS `OGC:CRS84` means that the geospatial features must be stored in the order of longitude/latitude based on the WGS84 datum. -Custom CRS can be specified by a string value. It is recommended to use an -identifier-based approach like [Spatial reference identifier][srid]. +Non-default CRS values are specified by any case insensitive string that uniquely identifies a coordinate reference system associated with this type. +To maximize interoperability, suggested (but not limited to) formats for CRS are: +* `authority:code` - where `authority` represents some well known authorities, and `code` is the code used by the authority to identify the CRS - examples are `OGC:CRS84`, `OGC:CRS83`, `OGC:CRS27`, `EPSG:4326`. See [https://spatialreference.org/](https://spatialreference.org/) for definitions of coordinate reference systems provided by some well known authorities. Review Comment: Let's add one more EPSG example, for example `EPSG:3857`. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
