Hi,

The documentation of OGRwkbGeometryType mentions the following:

wkbPoint25D             2.5D extension as per 99-402
wkbLineString25D        2.5D extension as per 99-402
wkbPolygon25D   2.5D extension as per 99-402
wkbMultiPoint25D        2.5D extension as per 99-402
wkbMultiLineString25D 2.5D extension as per 99-402
wkbMultiPolygon25D      2.5D extension as per 99-402
wkbGeometryCollection25D 2.5D extension as per 99-402

What does "99-402" refer to and where can I learn more about this 2.5D extension?

Regards,
Stefan
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