Skip to main content
U.S. flag

An official website of the United States government

What is GeoMark and do USGS topographic maps have it?

Almost all historical topographic maps and all US Topo maps produced before June of 2017 were georeferenced using software from the company TerraGo. Those maps are all GeoMark enabled. 

GeoMark is TerraGo's geospatial data extension to PDF markup. GeoMark allows notes and geometric objects (lines, polygons, etc.) to be added to a GeoPDF and allows these objects to be exported to GIS files.

Users of these products can add and export Geomarkup using free Adobe Reader software and the Terrago Toolbar plugin. Exact behavior of the GeoMark tools varies between versions of Adobe Reader and the TerraGo Toolbar. GeoMark functions might not work on USGS topographic maps if you are using older versions of these software tools. 

USGS topographic maps (US Topos) created after June 2017 are NOT GeoMark enabled because we no longer use Terrago software to produce our maps.

Learn more: 

Related Content