About Zipdy
-----------
Zipdy is a program for calculating the distance between two zip
codes and finding all the records in a RDBMS with a zip code
with x miles of another zip code. Currently, RDBMS support
exists for postgreSQL. Additional future support for other
databases will be added in future releases of zipdy.

Zipdy is public domain software. Zipdy was written in C but is
also available in PHP and perl. It runs with data from the US
Census Gazetteer program. The data is from the 2000 census.

The distance calculations are made by doing a great circle
calculation on longitude and latitude points provided by
the census data. The result is returned in standard miles.

Full information about the installation of Zipdy can be
found in the INSTALL file in this directory.


Files
-----
zipdy-x.x.x	Zipdy Distribution Archive
	AUTHORS		Contributors to the Zipdy Project
        BUGS		Known Bugs and problems with Zipdy
        COPYING		Statement of Public Domain Status
        NEWS		News
        README		This file
        TODO		Work to be done on Zipdy
        INSTALL		Instructions on how to install Zipdy
	doc/	Additional Documentation
        	faq.html	Frequently Asked Questions
	cgi/
        	zipdy.c		C version of Zipdy CGI Script
                zipdy.php	PHP version of Zipdy CGI Script
                zipdy.pl	Perl version of Zipdy CGI Script
        optional/
		gdbm_create.c	Program to convert Census Data
                		  file To GDBM database
                zipdy_force.c	Program to generate data files
                		  from GDBM database
                zipdy_test.c	Program to test GIS calcs on your
                		  system
        proximity/
        	convert_to_sql.pl	Perl script to convert data
                			  files to sql script
                zipdy.sql		Zipdy db schema


Patches
-------
I ask that you surrender copyright on your patches to Zipdy
over to the maintainer.  If you do not surrender copyright,
please state so explicitly in your submission email.  I will
most likely attempt to reimplement your patch if you do not
surrender your copyright.