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opengeospatial / ogc-geosparql

Public Repository for the OGC GeoSPARQL Standards Working Group
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clarify geof:is3D and geof:isMeasured #494

Closed VladimirAlexiev closed 7 months ago

VladimirAlexiev commented 9 months ago

13.9.20. Function: geof:is3D

The function geof:is3D Returns true if geom has z coordinate values.

13.9.22. Function: geof:isMeasured

The function geof:isMeasured returns true if geom has m coordinate values.

I suggest to elaborate these descriptions a bit and relate to the only other place in the spec that mentions "m coordinate":

The function geof:is3D Returns true if geom has Z coordinate values. See 13.2. GeoSPARQL and Simple Features (SFA-CA) for a description of GeoSPARQL's limitations: currently it supports 2.5D and geometric functions ignore Z values in calculations.

The function geof:isMeasured returns true if geom has M coordinate values, as used e.g. in linear referencing. See 13.2. GeoSPARQL and Simple Features (SFA-CA) for a description of GeoSPARQL's limitations: at the moment it does not support linear referencing and M values are ignored.