PLSS Data

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.

• Current
  • https://navigator.blm.gov/services.  This is not very easy to use, and we have not gotten it to work.  You will probably have to deal with the Geodatabase format; it might be possible to convert to shapefile with QGIS.
• Old:
  • BLM download, in zipped shapefiles. You can get state or county downloads. This will use a popup, so insure that your browser will allow it (Internet Explorer may work best).  Do not get the Geodatabase format.
• Download to a subdirectory under "c:\mapdata\plss" directory, and unzip. Because each set of files has the same names, you must uncompress each download to a different subdirectory.  The shapefile "twnshp" describes the township boundaries; "first" has the section boundaries; and "ladesc" describes quarter-quarter sections.  You need the DBF, SHP, and SHX file for each shapefile.  Since the BLM may limit the size of downloads, you might have to merge shapefiles  on the merge menu of the data manipulation form, or just use multiple directories.
  • Set the base directory to use on PLSS options. Make sure that the folder you want, under "c:\mapdata\plss", opens when you click on it, and then pick OK.
  • The program can deal with the BLM files, and the alternates, but they must be placed in different directories.
  • You must use files downloaded after May 2004 in WGS84.
  • The first time you use the files, the program will rename the shapefiles to "twnshp_84" and "section_84" and "quarter_84".
  • You can remove some fields from the files to save hard disk space.
  • You can use the Calculate, PLSS position menu choice. Double clicking on the map will show the position in Lat/Long and PLSS.
  • Map Overlays PLSS options. You can choose whether to show townships, sections, and quarter sections, and to label townships and sections.
  • You can automatically draw the PLSS grid when a map draws. To do this:
    • Enable "Use PLSS" on Menu tab of the options form.
    • Have "Auto Draw PLSS" check box selected on the Vector Map tab of the options form, or on the grid options form.
    • The grid will be drawn every time, with the level of detail (townships, sections, or 1/4 sections) depending on the scale of the map.

The program can use Alberta township data. 

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.

• http://www.geocommunicator.gov/TownshipGeocoder/TownshipGeocoder.asmx?op=GetTRS
• http://www.earthpoint.us/TownshipsSearchByLatLon.aspx
• http://www.legallandconverter.com/p43.html
• http://www.metzgerwillard.us/plss/plss.html works in Google Earth

Web Services

• https://navigator.blm.gov/services

Last revision 6/5/2017