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The ISO 19100 series of standards, like many other GIS frameworks, empha= sizes 2D spatial coordinates with various reference frames which are fixed = to the rotating earth. There is, however, some nominal functionality defin= ed to support 3D geometric constructs. This page is a challenge to figure = out how to represent one of the simplest 3D constructs using the framework = provided by ISO 19107.
For the coverage effort, there is a need to define a grid cell with thre= e spatial dimensions which is bounded by grid points at the corners. For i= nstance, the grid cell occupying the volume between (0, 0, 0) and (1, 1, 1)= would have the corners:
Note that I am not interested in specifying topological relations (edges= ) between the corner points. I just want to represent the rectangular soli= d volume bounded by these corners.
If you're the first to figure it out, edit this page with a solution (or= attach a comment). If you're prevented from editing this page, email= me. The first valid solution wins my heartfelt respect and admiration= . You may also win some empty flattery.
We will keep your solution on this wiki page to help future pioneers gra= pple with the third dimension of 19107. If you could please express your s= olution in the manner of a short descriptive article, I'd be very grateful.=
The solution was not long in coming. John Herring of Oracle Corporation= (none other than one of the editors of the standard) responded with instru= ctions on how to make a cube. As such, he probably has enough fame that wi= nning this contest is an insignificant addition.
For those unfamiliar with ISO 19107, a cube is a polyhedral surface, 6 f= ace polygons with 4 distinct points each (5 to close with the first =3D las= t). Each face shares its 4 edges with 4 other faces (with orientation
A unit cube at the origin is (using a variant of SF4SQL WKT):
The ISO 19107 geometry specification may be found on the OGC website. Download the spec.------=_Part_40349_675053238.1371600477286--