Re: [sdw] Update to Gaps section (#1355)

"other spatial types should be mentioned as well. For example coverages, 3D meshes, and building information management data are all spatial data" - agree in principle.

But, BIM is more of an "application schema" that uses spatial types. It does use a different subset of the "vector" spatial representations to that usually used in GIS, but it's not unique in that.

- GIS generally uses "surveyed" data, where curves are represented by linear interpolation (in the relevant CRS) between points along the curve.
- BIM (and some legal GIS such as maritime boundaries) prefers parametric curves, defined by mathematical arcs.

This reflects the origin of BIM & much BIM data in design drawings, rather than 'as built' surveys. 

So if we want to go that detail, we would divide "vector" spatial types into "surveyed" and "modelled" (or some such - those are terms I just created here). I suspect coverage aficionados would claim that 3D meshes are a kind of coverage. It all depends on what aspect one uses to partition the "spatial type" conceptual space!

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Received on Monday, 23 May 2022 09:31:00 UTC