The use of the panoramic camera in topographic surveying; with notes on the application of photogrammetry to aerial surveys

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...made suggests that the selection of stations deserves all the attention the topographer can give to it. Difficulties met in traveling have a marked influence upon the rate of progress of topographic surveys, however, so that the disparity between possible and actual results can not be entirely eliminated by selection of more favorable stations. In the examination whose results are given in Table 6, station 1 was situated at the edge of an intricate mountain mass, so that it embraced a wide valley on one side and many ridges and spurs on the other. It was isolated with respect to nearly one-half the area. The area shown in the photographs is small, but as most of the crests are visible the station should be rated as well selected. Station 2 was surrounded by less complex topographic forms, so that though the ratios indicate more efficient photographs than those obtained at station 1, the actual number of points supplied by them was considerably less. Station 3 was well isolated and surrounded by country of simple topography. The high value of the photographs taken at station 4 is due to the isolation of the station. The photographs taken from stations 5 and 6 have only between one-third and one-half the value of those taken at more favorable locations. USE OP CAMERA. MANIPULATION. The manipulation of the camera at the stations is simple. At most stations it is necessary to shift the camera to one or two near-by positions in order best to photograph the country. When the camera is moved to near-by points the directions and distances from the station to the substations are noted. As a rough guide to the photographs the general direction of the view must be known. Some known point mentioned as "near center," or "20 from left edge" adequately...