Show aerial mats maps ma ts to t have ave many T uses T ses ross field officers develop photo to meet traffic needs of cities NOT HOT TAUGHT IN ARMY SCHOOL lenses have been discovered especially adapted for this type of work great aid in surveying arcadia cal ca new fields in engineering gi studies are being opened at the army balloon and airship school at ross koss field here in tile the department af 0 plotting frow from photographic maps according to officers of the recently reorganized school the plotting study room Is equipped with au an enormous photographic 1 map embracing square miles of territory almost to los angeles Ange Jes of holcli arcadia Is the center the map Is a mosaic ot of several thousand photographs taken by balloon or cir airship from an altitude of feet cities to use maps As a result of these studies by the langley field virginia and arcadia schools the two tio great centers of the army air service a number ot of cities are planning to use aerial photographic maps in connection with city planning truffle control street widening and fire alre protection work according accordine to army ami officers other uses to which photographic maps are being put are preliminary investigations of watersheds hydroelectric de developments highway rall rail road and canal location forest tur and various engineering works army air officers have perfected automatic timing of exposures to cover tile ilie proper ground area and at the same time secure the necessary overlap for the accurate fitting together of individual negatives this permits taking of pictures ores from the mo moving moong ong airship or airplane perfect picture methods lenses have been discovered especially adapted tor for this type of work and tit the officers have developed the technique covering such details as the liest height from which to take pictures tor for specific purposes speed of air airplane pinne and maintenance of level flights to insure verticality of view the hie maps now produced by air service photographers according to officers attain a high gh degree of accuracy coracy ac and of valuable detail aerial photography Is among the subjects taught at the koss field school air service officers point out that among points of particular value til in engineering to be found in aerial photography are the speed with which such maps may ile be produced ability to cover territory inaccessible oil foot comparatively low cost cast and impossibility lity of omitting any feature of the area phot photographed ogra plied the mosaic moi ac map army officers say does docs not mean transit stadia nil and I 1 plane lable are in the discard hut hot that lingi engineering surveys made solely by allese lime tried instruments fiill ill be out of late |