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Clarify null/missing crs key #225

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Jun 1, 2024
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Clarify null/missing crs key #225

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2 changes: 1 addition & 1 deletion format-specs/geoparquet.md
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Expand Up @@ -65,7 +65,7 @@ The Coordinate Reference System (CRS) is an optional parameter for each geometry

The CRS MUST be provided in [PROJJSON](https://proj.org/specifications/projjson.html) format, which is a JSON encoding of [WKT2:2019 / ISO-19162:2019](https://docs.opengeospatial.org/is/18-010r7/18-010r7.html), which itself implements the model of [OGC Topic 2: Referencing by coordinates abstract specification / ISO-19111:2019](http://docs.opengeospatial.org/as/18-005r4/18-005r4.html). Apart from the difference of encodings, the semantics are intended to match WKT2:2019, and a CRS in one encoding can generally be represented in the other.

If CRS is not provided, all coordinates in the geometries MUST use longitude, latitude based on the WGS84 datum, and the default value is [OGC:CRS84](https://www.opengis.net/def/crs/OGC/1.3/CRS84) for CRS-aware implementations.
If the `crs` key does not exist, all coordinates in the geometries MUST use longitude, latitude based on the WGS84 datum, and the default value is [OGC:CRS84](https://www.opengis.net/def/crs/OGC/1.3/CRS84) for CRS-aware implementations. Note that a missing `crs` key has different meaning than a `crs` key set to `null` (see below).

[OGC:CRS84](https://www.opengis.net/def/crs/OGC/1.3/CRS84) is equivalent to the well-known [EPSG:4326](https://epsg.org/crs_4326/WGS-84.html) but changes the axis from latitude-longitude to longitude-latitude.

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