A practical review of how to identify and specify coordinate systems for applications
built on PROJ.4, use of EPSG codes or use of OGC Well Known Text.  Detailed examples
will be given for a variety of coordinate system, including examples of how it would
be used with applications such as MapServer, GRASS, GDAL/OGR, and PostGIS.  However,
the techniques should apply to any application built on the same representations.