Navy Oceanographic Office, Suitland, Maryland; (9) USAF
Aeronautical Chart and Information Center, St. Louis, Missouri,
and (10) Pacific Air Industries of Long Beach, California, in
cooperation with Aerial Control Geotronics, Monterey Park,
California.
Each of the applications (3), (4), (5) and (10) tend
to follow the lead of (3) in using, in general, the same
type of instruments and procedures for topographic mapping,
specifically, the PUG stereoscopic image transfer device,
the Mann monocomparator and medium-size computers. The basic
concepts are versions of the works of Dr. Hellmut H. Schmid [l]
which referred to principles stated by 0. Von Gruber [2] in
1932. Details of (3) were reported by Harris, et al [ 3l in
Photogramme trie Engineering magazine in March, 1962.
You may be interested in one of the rather unusual-
applications of analytic aerotriangulation. Public utility
inventory items consist of such things as electric power
transformers, pipe line junctions and pumping stations, electric
transmission towers, etc. Utility companies ordinarily pay
local taxes on the value of their inventories. Analytic
aerotriangulation is serving to determine the legal plane
coordinates of each item. Then these coordinates are ideal-
addresses and descriptions of the items for use with automatic
data processing equipment.
Why was analytic aerotriangulation selected? It is the
opinion of this reporter that in four of the applications,
the analytic system cost lest initially than a first-order
plotting instrument. The selections were made in spite of
two known drawbacks: (1) a second skilled operator is
required for the PUG; and (2) the analytic system is somewhat
slower than the plotters. The selections were also made with
the idea of using the fine accuracy features to allow economics
through the application of correspondingly greater flight-
altitudes. In one instance the opportunity to avoid the
danger of extremely low altitudes without jeopardizing accuracy
was attractive.
Occurrence in U.S. Literature
Undoubtedly some of you have been aware of the popularity
of computational photogramme try in our technical magazines.
The American Society of Photogramme try includes Computational
Photogramme try as one of its four standing Technical Committees:
it was organized in 1961 through popular demand. Of the
articles appearing in Photogrammetrie Engineering magazine in
1963, 17% were on computational photogramme try. At the October
1963 Semi Annual Convention of the American Society, 20$ of
the papers were on this subject. At the March, 1964 Annual
Convention, the Committee sponsored a panel discussion including
nine papers; other speeches were also presented at different
sessions so that a total of 14$ of the papers were on analytics.
