1959 US Army Vietnam War Terrain Intelligence ... - Survival Books

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Examination with a stereoscope gives an exaggerated thirddimensional
view of the terrain included in the overlap.
A vectograph is a print or transparency in which the two
photographs of the stereoscopic pair are rendered in terms
of degree of polarization, presenting a stereoscopic image
when viewed through Polaroid spectacles. An anaglyph is
a picture combining two images of the same object, recorded
from different points of view, as images of the right and left
eye, one image in one color being superimposed upon the
second image in a contrasting color. Viewed through a pair
of light filters, the anaglyph produces a stereoscopic effect.
(5) Controlled mosaics of an area provide an accurate map
from which measurements of distances can be obtained.
Their use in a terrain study should be confined to the analysis
of major physiographic units, contrasting soil patterns, or
differences in vegetation. The amount of detail provided
for a thorough terrain analysis will depend upon the scale
of the mosaic.
(6) Information obtained from aerial and ground photographs
should be correlated with other sources of information, such
as published material, maps, personal reconnaissance, or reports
from intelligence agencies.
20. Books, Periodicals, and Reports
a. General Sources. Valuable terrain information can be found in
a wide variety of both technical and nontechnical books, periodicals,
and reports published by governmental and private agencies. These
include trade journals, economic atlases, tide tables, pilots' handbooks,
tourist guides, and similar publications. Unpublished systematic
records covering meteorological, hydrological, and similar
scientific data prepared by government agencies, engineering firms,
private societies, and individuals also contribute valuable terrain
information. While utilized chiefly for terrain studies made by
higher headquarters, material of this type, when locally available, can
be of considerable value to lower echelons.
b. Intelligence Reports. Strategic intelligence studies prepared by
Department of Defense agencies provide detailed terrain information
concerning major geographical areas. Such studies include-
(1) National Intelligence Survey (ANIS). This is a series of
documents covering the countries of the world, presenting a
concise digest of the basic intelligence required for strategic
planning and for the operations of major units. Each survey
describes in detail the pertinent terrain characteristics
of a specific area, supported by descriptive material, maps,
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