This Makefile is used to create some layers from the Tiger 2007
datafiles.  Mostly These are just subselections for California, and
some simplifications.  The following packages are included.

* Zipcodes - California Zipcode Tabulation Areas. Use "make -f
  CaSIL/Makefile zipcode.zip"


As with many CaSIL Makefiles, use ofs made of somewhat non-standard
applications including, but not limited to:

- [http://postgis.refractions.net/ PostGIS], a spatial extension to
  the Postgresql database system.

- [http://www.gdal.org GDAL], a set of tools for vector and raster
  processing.


Typically, the prospect of creating these files is using the included
Makefile, although the specifics for running this is not always well
defined.