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.