The Public Land Survey System uses Townships and Sections, and  encompasses almost 1.5 billion acres of land beginning with the Land Ordinance of 1785. These surveys of townships and sections begin in Ohio and extend to all parts of the United States except the original thirteen colonies. There are approximately 2.6 million section corners, each located about a mile apart. PLSS assumes a flat earth, and earth curvature plus surveying errors leads to some very interesting "rectangles".


US Data used to be downloaded from the BLM.  This has apparently been deprecated, and you have to deal with the wonderful ESRI Geodatabase format.  It is now up to you to convert those to shapefiles, in the same format they used to have.  Maybe it is time to just use Lat/Lont, UTM, and MGRS.

The option to use Alberta township data has been removed. 

Online converters.  Our experience is that the 1/4-1/4 database has problems, and you might want to verify any critical results (or switch to more modern ways to locate positions, such as Lat/Long, UTM, or MGRS/USNG.

Web Services

Last revision 6/1/2020