Merged County DEM Metadata
The spatial data used to create the merged DEM was originally downloaded from the US Geological Survey in October 2003. USGS DEMs used comprise a mix of 30 meter and 10 meter cell resolution, depending on what was available at the time of download.
The projection used is geographic coordinate system, NAD 83 horizontal datum.
To find specific creation dates for any individual part of these DEMs, please go to the USGS web site at www.usgs.gov.