TN leaflet map
Enter street,city,state or zip code or lat,-lon (dd.ddd)
     (for other lat/lon encodings or UTM or NAD27 use this)
Distance buttons: left click on map to make a track
this button will popup a window from which you can save the track as a file.gpx for uploading to your GPS.
   Plot track elevation profile -- google elevations (10m DEM) and area (acres)
   Plot track elevation profile -- courtesy of heywhatsthat.com (30m SRTM)
Add TN county lines to map:

From DEM data, Anderson county sinkholes (red circles) with a depth of 3m or more. For all sinkholes (on topos) and more discussion see Anderson county sinkholes


Anderson County sinkholes
The map above shows the location of 600+ sinkholes (black map pin) on the USGS topo quads for Anderson County. Using the terrain or topo layers of the google map, you can see that the sinkholes lie along the valley and ridge section of Anderson County. By contrast the Cumberland Mountains lie in the northwest section of the county with sandstone and coal seams in the 3000' high range.

The digital analysis of the USGS DEM data for Anderson County shows there are 239 sinkholes of depth 3m or more (red circles). The deepest sinkhole (68') in Anderson County is at 36.147386,-84.109287 (paste into Find box on google map). This sinkhole also has the largest volume and area for the county.

If you have explored Anderson County, you know there are many more sinkholes that the USGS topo/DEM data does not record. For example in the Norris watershed, the Eli Nine Sinkholes trail passes by 9 sinkholes, only one of which shows on the topo map. Though USGS mistakes are rare, there is NOT a sinkhole at 36.009696,-84.30096.

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Tom Dunigan TNlandforms.US