Apparently, this user prefers to keep an air of mystery about them.
23 What is the difference between DEM, DSM and DTM? Feb 1 '11
11 Pure Python Library for Geometry Operations Mar 12 '11
11 Performance of Shapefile and PostGIS with GeoServer? Apr 10 '13
7 Producing multiple PDF plots of mapsheets specified by shapefile key from ArcGIS Desktop? Oct 26 '10