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BRANNER EARTH SCIENCES LIBRARY AND MAP COLLECTIONS
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Using the Map Collections

Maps: Frequently Asked Questions

Air photo scale.  How to determine?
    Altitude divided by focal length = scale. For example 10,000 ft (x 12) / 24 in. = 1:5,000
Lake Depth, How to determine?
    Some navigable lakes, e.g., Tahoe, are covered by a US NOS nautical chart. If the lake is in a park, forest, etc. the ranger office for that particular area probably knows the maximum depth. For resevoirs, if you have a map that shows the maximum pool elevation of the surface, you could subtract the elevation at the base of the dam for a rough estimate of maximum depth. Compare differences in coutours at the dam base versus those on the lake shore. Consult commercial fishing map of the lake (these frequently show isobaths). Look at old editions of 7.5 or 15 minute USGS topo maps that show reservoir before it was filled (remember, though, that the lake may have silted in since it was filled). Source: Mark Thomas (e-mail to MAPS-L May 8, 2000) and Phil Hoehn
Magnetic Declination, How to determine?
    Topographic map sheets and aeronautical charts usually contain this information. Try also the following web site:

Photocopies, How can I obtain?

    Branner Library has self-service photocopy machines (8.5 x 11, legal, and engineering (36 inches wide by any length)). Other information, including that for remote users, is available at:
      Stanford Geoscience Maps: Access & Circulation

Maintained by Julie Sweetkind  

Last modified: June 22, 2005

   
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