WORKING GROUP 9
MOLLARD
517
Fig. 2. Rough laydown mosaics are sometimes assembled and annotated for field use. This
mosaic covers an area of 50 square miles and shows glacial-lake strandlines (dashed) and shal
low sand and gravel beach deposits (full lines). Places to field check are marked X. A recom
mended “gravel-haul” road (little circles) was indicated in the event that suitable materials
were found for road-surfacing purposes.
exploration information as possible. At this stage of the investigation the photo
interpreter should have a good idea of the type of testing best suited to the
area, how much testing will be required, where it should be concentrated, and
what this testing is most likely to disclose.
Experience shows there is a great deal of merit in having the photo inter
preter who made the airphoto search also carry out the reconnaissance field
check of mapped prospects.
Interpreted data shown on photos and plans
The interpreter provides maximum assistance by showing and carefully
qualifying all data that can be confidently inferred from the photos. However,
the interpreter must be watchful not to give misleading data. For instance, he
should not state inferences as if they were facts, or wild speculations as if they
are legitimate inferences. Just how well the interpreter achieves this desired goal
depends largely on his training and experience in photo interpretation.
Following are types of data most commonly annotated on airphotos and on
plans prepared from aerial photographs.