Location based DB schema in mySQL

http://dev.mysql.com/tech-resources/articles/4.1/gis-with-mysql.html

http://dev.mysql.com/doc/refman/4.1/en/spatial-extensions.html

http://howto-use-mysql-spatial-ext.blogspot.com/

http://forge.mysql.com/wiki/GIS_Functions#Introduction

http://forums.mysql.com/read.php?23,40909,43079#msg-43079