Maps were produced by USGS at that scale as early as 1904, with revisions made until 2006. 3DHP uses updated, high-accuracy elevation data ... "The State of Tennessee is very excited to continue ...

April 10, 2025 /PRNewswire/ -- The U.S. Geological Survey has selected Woolpert to process and delineate elevation-derived hydrography for the state of Tennessee in support of the 3D Hydrography ...