Digital Elevation Models (DEM) are digitized versions of USGS's 7.5 degree topographic maps. With the help of additional software, they may be used to automatically define the base elevations for objects included in air dispersion modeling analyses. These DEM files can be downloaded from this website below. All DEM files on this site are listed based on the letter they begin with and are named based on the USGS quadrangle they represent.

Choose the letter with which the name of the quadrangle begins:

Choose the DEM file you wish to download:

Hamburg
Hamilton
Hampton N
Hampton S
Hanford
Hanover, IA
Hanover, IL
Hansell
Harcourt
Hard Scratch
Hardy
Harlan
Harmony
Harper
Harpers Ferry
Harris
Harrisburg
Hartford
Hartley
Hartley SW
Hartwick
Harvey
Hatfield
Havelock
Hawarden N
Hawarden S
Hawkeye
Hawleyville
Hayfield
Hazelton
Hedrick
Herman
Hiattsville
Highlandville
Hills, IA
Hills, MN
Hillsboro
Hinton
Hiteman
Hobarton
Holbrook
Holland
Holmes
Holstein
Holstein SW
Holy Cross
Homer
Honey Creek
Hopeville
Hopkins
Hopkins SW
Hopkinton E
Hopkinton W
Hornick
Hospers
Hubbard
Hudson
Hull
Humboldt
Humeston
Huxley