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the contact is not fault controlled. To make this decision, 
however, additional knowledge of the geologic history of 
the region is required. At this stage field investigations 
may be necessary. 
As a complement to the satellite data all available 
SLAR coverage for a project area is acquired and a SLAR 
linear overlay is compiled if available. 
Other input data such as aeromagnetic and gravity con- 
tour maps can also be applied to the geologic analysis. 
Regional anomalies, where found, can be matched to the scale 
of the linear overlays and highlighted to emphasize zones 
for priority field checking at later stages of the siting 
program. The highest order of priority generally would be 
accorded those zones where satellite lineaments are coin- 
cident with known faults, SLAR lineaments and magnetic and/ 
or gravimetric anomalies. 
The procedures described above constitute an initial 
(reconnaissance) phase from which a "first-cut" evaluation 
of potential sites can often be made. With this data it is 
frequently possible to decide whether or not the site(s) 
is worthy of additional consideration. If the decision is 
in the affirmative, follow-up analysis, utilizing additional 
available high and low altitude aerial photographic coverage 
may be conducted. The aerial photography, because it provides 
higher resolution and greater detail, is useful in the con- 
struction of more detailed geologic maps of localized areas. 
The resulting maps are useful in orientating field geologists 
as to outcrops locations, morphology, tonal variations and 
the like and for planning traverses for close field inspections. 
Experience from previous investigations indicate that copies 
of the satellite, SLAR, aeromagnetic, gravity and aerial 
photography can be used in the field offices for correlation 
with findings on the ground. 
Other Disciplines 
The foregoing discussion concentrated on the geologic 
aspects of nuclear power plant siting. This reflects the 
authors' background and experience. It is to be emphasized, 
however, that nearly all of the disciplines involved in a 
nuclear power plant siting investigation utilize remote 
sensing in some manner. 
One remote sensing technique which in our experience 
has wide appeal to many of these disciplines is multispectral 
processing of digital Landsat data. This method is appli- 
cable to wetlands mapping bio-vegetative maps, agricultural 
Crop mapping, water bodies, identification of cultural 
features, and tree stand type mapping.