PHOTOGEOLOGIC TRAINING IN THE U. S. GEOLOGICAL SURVEY 
  
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COMMISSION VII Mj 
Appendix to the INT. ARCHIVES OF 
PHOTOGRAMMETRY, Vol. XlII4, 195: 
With greater use of aerial photographs &a—geelogie—mapping— rd 
it is imperative that the geologists be made aware of the photo- 
grammetric instruments and photogeologic techniques available 
that could assist in the compilation of the geologic maps and 
solution of geologic problems. Training centers offering instruc- 
tion in photogeologlic and photogrammetric techniques have been 
set up to meet these needs. 
Robert H. Morris 
  
The Geological Survey has established two training centers, 
one in Denver, Colorado, and one in Menlo Park, California. 
These centers offer training in photogeologic procedures for 
geologists, The courses are designed to provide instruction in 
the interpretation of geology from aerial photographs and in the 
use of photogrammetric instruments in geologic studies. Personnel 
of these offices are trained and experienced in the use of photo- 
grammetric equipment and photogeologic procedures as well as in 
geologic field work. The Denver training center is equipped 
With a variety of stereoscopes, stereometers, one Kelsh and two 
multiplex plotters, several radial planimetric plotters and a 
Ryker (Mahan) plotter. Many of the portable items are available 
for loan to geologists; other items, such as the heavy plotters, 
are available on a schedule basis. The Menlo Park office is 
stocked with similar equipment. 
The schedule of the photogeology training program provides 
training for a maximum of about 100 geologists per year in each 
of the centers. Training is carried on throughout the year. 
The programs were established in November 1954, Classes convene 
for three hours daily for a period of two weeks. The following 
topics are typical of the material presented: 
1. Geometry of the aerial photograph 
Stereoscopes 
Parallax, and parallax measuring devices 
Vertical exaggeration 
Tilt in aerial photographs 
Radial triangulation with aerial photographs 
Various plotters, Kail, Kelsh, Multiplex and 
Balplex