PLSS Map

A PLSS map, or public land survery system map, uses a combination of coordinate systems, grid sytems and topographic maps. These particular maps usually are surveys and describe lands owned by the Federal Government. This particular map depicts the base lines and principle meridians that run through the United States.




http://gis.nwcg.gov/giss_2006/job_aids/maps_and_graphics/USA_PLSS_Meridians_map.jpg