Digital Elevation Models

KeyUSGS National Elevation Dataset (NED) seamless datasets are composed of the best available raster elevation data for the United States. Bare earth surface elevation (does not show tree canopy or buildings - lidar datasets can include them) Available for free download from USGS National Map Seamless Server. FAQ

arc-second
Aproximate point dimension (X/Y) meters
Approximate Vertical
Accuracy (Z) meters
Aproximate Scale
Lower 48 State Coverage
1
30
+/- 7
1:24000
full
1/3
10
+/- 7
1:8000
full
1/9
3
+/- 1
1:2666
partial
Ohio Dayton

Currently only the 30 meter data is available for all of Ohio on this website. I am working with an area University to house the 10 and 3 meter tiles.

Google Earth tiles for Ohio 30 meter shaded DEM using NED data. Elevation colors are based on the Ohio elevation range from 455 feet at the Ohio River near Cincinnati to 1,550 feet at Campbell Hill near Bellefontaine. This accentuates the elevation differences within Ohio. Source: USGS: highest and lowest points by State. (Created using Global Mapper software)

For use in a lab setting, it is recommended that you download the OhioDEM.zip file (86MB) to a local server accessible to your lab, uncompress into a folder, and link to the doc.kml file. For wireless laptops, you may wish to save the files on each laptop hard drive. (Tip: kmz files are zip compressed kml files, usually including the referenced image files - change the .kmz extension to .zip if you wish to uncompress the file.)

The Ohio Division of Natural Resources Division of Geological Survey has produced an Ohio DEM using the same NED data. Page 2 of the pdf version includes a detailed explanation of the more striking topographic featuers. Additional pdf Geologic Maps of Ohio are available here. There is also an educational resources page.

The Northeast Ohio Geoscience Education Outreach website has many K-12 activities related to Ohio Geology.

 

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