| Shows a technique for using a zero-width buffer to compute
the union of a collection of polygonal geometrys.
The advantages of this technique are:
- can avoid robustness issues
- faster for large numbers of input geometries
- handles GeometryCollections as input (although only the polygons will be buffered)
Disadvantages are:
- may not preserve input coordinate precision in some cases
- only works for polygons
version: 1.7 |