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Update the SRID definition of the parquet raster standard #276

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bedaf5d
Update the SRID section of parquet raster standard
jiayuasu Aug 18, 2025
feb4304
Update the CRS field to use auth_name:code
jiayuasu Aug 18, 2025
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12 changes: 7 additions & 5 deletions format-specs/parquet-raster.md
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Expand Up @@ -101,12 +101,14 @@ The allowed URI schemes are:
CRS is represented as a string value. Writer and reader implementations are
responsible for serializing and deserializing the CRS, respectively.

As a convention to maximize the interoperability, custom CRS values can be
specified by a string of the format `type:value`, where `type` is one of
the following values:
To maximize interoperability, a CRS value SHOULD be specified using the format `authority_name:code`. This string (case-sensitive) must reference a CRS identifier from the [Spatial reference identifier](https://spatialreference.org/projjson_index.json) catalog.

* `srid`: [Spatial reference identifier](https://en.wikipedia.org/wiki/Spatial_reference_system#Identifier), `value` is the SRID itself.
* `projjson`: [PROJJSON](https://proj.org/en/stable/specifications/projjson.html), `value` is the PROJJSON string.
While a custom CRS can be specified using a full [PROJJSON](https://proj.org/en/stable/specifications/projjson.html)
string stored in this field, this approach is DISCOURAGED for performance reasons.
Instead, it is RECOMMENDED to use a well-known CRS identifier whenever possible.

If no CRS value is provided, the default is [OGC:CRS84](https://www.opengis.net/def/crs/OGC/1.3/CRS84), which
represents longitude, latitude coordinates based on the WGS84 datum.


## Metadata
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