San Francisco Bay (CA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 03/50-08/51
Line spacing 1.6 (km)
Altitude 304.8 (m) above ground
Total distance 1,802 (km)
References
Counties Alameda - Contra Costa - Marin - San Francisco - San Mateo
Overlapping surveys

Data: Magnetic (M-Dz)