Introduction

The ISO 19107 Geometry specification can be a little difficult for normal humans to interpret and use. Unfortunately, successful usage of the standard requires that at least three individuals interpret the standard the same way: GeoAPI authors, authors of an implementation, and the clients of a GeoAPI implementation. Doubly unfortunate is the fact that each of these individuals is likely to have a different background with respect to mathematics and topology.

This wiki page is intended to be a central touchstone for clients of the ISO 19107 Geometry specification. The questions and answers to which this page links are intended to be gleaned from discussion on various development mailing lists. The preferred place to inquire about the meaning of items in the 19107 standard is the GeoAPI mailing list. In this way, results of the discussions can be captured in the GeoAPI documentation for all implementors to share.

Questions

1. How do I make a cube (or other 3D solid) using the constructs in ISO 19107? Answer
2. What is the spanning surface of a polygon?