wgtmac commented on code in PR #494:
URL: https://github.com/apache/parquet-format/pull/494#discussion_r2068914012
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Geospatial.md:
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@@ -162,3 +195,23 @@ The axis order of the coordinates in WKB and bounding box
stored in Parquet
follows the de facto standard for axis order in WKB and is therefore always
(x, y) where x is easting or longitude and y is northing or latitude. This
ordering explicitly overrides the axis order as specified in the CRS.
+
+# Special geospatial values
+
+A special geospatial value refers to the coordinate values of a
+non-`null` geospatial instance that should be excluded from bounding box
+calculations.
+
+* `NaN`: Not a Number. A `Point` with no X and Y values in WKB is
+ represented by a `Point` with each ordinate value set to an IEEE-754
Review Comment:
```suggestion
represented by a `Point` with each coordinate value set to an IEEE-754
```
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