4 PHOTOGRAMMETRIC ENGINEERING 
photographs. To a lesser extent such pictures have also been used to make counts of 
wildlife. 
"Practically all of the photographs are obliques, taken at low altitudes to show 
ground and cover details. Such pictures need little interpretation except for enlarging, 
and labeling on the print the development and planning features. Occasionally we also 
use the standard high altitude vertical mosaics for correcting our existing maps, for show- 
ing extensive recreation layouts, and for mapping vegetative cover. These mosaics we 
obtain from the usual Governmental and commercial sources. Color photography for 
oblique air photos has been used by us to a limited extent and has been highly successful. 
We use these pictures primarily in our public educational and interpretive program." 
For public education and orientation of visitors to the Vicksburg National 
Military Park, Vicksburg, Mississippi, aerial photographs of the Park are on 
exhibit in the park museum. These afford a stereoscopic view of various, fea- 
tures of the Park. 
As indicated by Colwell (1950), the manager of a recreational area may find 
use for an aerial photo mosaic as an attraction to his patrons. 
"A neat, suitably annotated mosaic, posted on the bulletin board or in the lounge, is 
readily interpreted by a hiker who, at the end of the day, wants to show his friends an 
easier way he found to climb the mountain. It holds a similar attraction for the fisherman 
who caught a big one in that hole just below the falls, or the golfer who hit into a sand- 
trap in the seventh hole, or the skier who almost ran smack into a particular tree on that 
downhill schuss.” 
Recently the author visited a duck marsh and noted an aerial photo posted 
in the clubhouse which could be used by hunters in locating their blinds, and in 
relating at the end of the day the courses taken by the ducks they saw entering 
the marsh. 
Colwell (1950) in his very interesting article also listed the following uses of 
aerial photographs in the field of forest recreation: 
1. Preliminary selection of localities suitable for development into recreational 
areas. 
2. Planning future developments which otherwise would require more detailed 
ground surveys. 
3. Properly locating trails in National Parks and recreation areas—taking into 
consideration scenic qualities of the routes, proximity to lake and stream fishing, 
availability of forage for pack animals, directness, and cost of construction and 
maintenance. 
4. Preparing an accurate map of the trail net once it has been laid out. 
5. As an aid by recreationists in locating unmapped lakes or other remote fishing 
spots or hunting areas. 
6. As an aid to hikers and to Alpine mountain climbers in picking routes for scaling 
peaks, or in reaching the most suitable points for photographing scenic areas. 
Although there are those who, for reasons best understood by purists, would 
not favor the use of aerial photographs or stereoscope as aids in mountain 
climbing (Wagar, 1951), the above illustrations indicate some of the ways in 
which such photographs may be utilized by individual recreationists, resort 
owners, and private or public recreational area managers. 
- Deep sea fishermen who use planes to spot schools of tuna must treasure 
aerial photographs, which show very clearly the number of fish in the schools 
and provide them with thrills of a lifetime. Ample proof that tuna show up 
clearly on aerial photographs can be found in the illustrated article by A. J. 
McClane (1952) in the March, 1952, issue of Field and Stream.