FEDERAL MAPPING AGENCIES 
Not all Federal mapping organizations provided information on 
their photogrammetric activities. The following descriptions are 
therefore typical of the programs and research undertaken, rather 
than a comprehensive Summary. 
BONNEVILLE POWER ADMINISTRATION 
Kirk E. Williams 
Photogrammetry is regularly employed in the location and design 
of electric power transmission systems. Routine applications include 
semi-analytical aerotriangulation, topographic and planimetric mapping, 
profiling and cross sectioning along roads and transmission lines, and 
delineation of land use. : 
A unique procedure developed by BPA is an automated data processing 
program to assist in the design of transmission tower leg extensions 
from data introduced directly to the computer from a digitized stereo- 
plotter. 
A second unique procedure employs photogrammetric ground cross 
sections and true height measurements to determine which trees would 
be dangerous to a transmission line and need to be removed. This 
"danger tree monitor" system consists of a 16K mini-computer (Honeywell 
316H) connected through Autotrol digitizing equipment to a Santoni 
Stereo-Simplex IIC or to a Kelsh plotter. Information relative to the 
tower positions, conductor elevations, and ground cross sections is 
stored in the computer. The stereoplotter operator positions the 
plotter at the top of a particular tree, and by observing which of four 
colored lights the computer activates, can establish clearing limits 
and individual tree removal requirements. The computer program 
permits the plotter operator to anticipate tree growth over a period 
of years which allows for selection of those trees which will become 
dangerous to the transmission facilities within any given period. 
BPA has purchased two Bendix Corporation US-1 analytical plotters 
which will be used for all existing photogrammetric operations. 
BUREAU OF THE CENSUS 
Morton A. Meyer 
The U.S. Bureau of the Census of the Department of Commerce and the 
U.S. Agency for International Development (AID) of the Department of 
State have been working together to develop the uses of satellite 
imagery in gathering or generating population data for developing countries. 
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