From:
http://www.radiomagonline.com/fcc/0019/fcc-reveals-m3-map-of-ground-conductivity-in-us/37366
[1]
FCC M3 Map of Ground Conductivity in US
Commission offering printable 43x69-inch map
January 28, 2016
The map shows that ground conductivity across the U.S. ranges from
0.5 to 30 millimhos (or millisiemens) per meter. The FCC also reports
that the conductivity of seawater is 5,000 millimhos per meter.
The downloadable map comes in 48 portions that can be printed.
https://www.fcc.gov/media/radio/m3-ground-conductivity-map [2]
The FCC is also offering the conductivity data as text files and also
includes data for the Chesapeake Bay and Puget Sound, which is not
shown on the printable map.
Links:
------
[1]
http://www.radiomagonline.com/fcc/0019/fcc-reveals-m3-map-of-ground-conductivity-in-us/37366
[2] https://www.fcc.gov/media/radio/m3-ground-conductivity-map
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