4812RS0001 

 COLEMAN, C. G., "Photographic Interpretation of Coasts and Beaches " Photogrammetric 

 Engineering, Vol. 14, No. 4, Dec. 1948, pp. 462-472. 



Keywords: Aerial Photographs, Coastal Mapping 



Article discusses plioto interpretation of beaches and coasts for military reconnaissance in 

 support of amphibious operations during World War II. Vertical and obhque photos were 

 used for determining conditions of beaches for wliich rehable maps or charts were not 

 available. The information required in amphibious planning was obtained from photos, even 

 poor quality photos that were often the only ones available. A combination of 

 photogrammetry and photo interpretation was used for the required information. Many 

 military applications have counterparts in civilian coastal studies. 



4812RS0002 

 LUNDAHL, ARTHUR C, "Underwater Depth Determination by Aerial Photography," 

 Photogrammetiic Engineering, Vol. 14, No. 4, Dec. 1948, pp. 454-462. 



Keywords: Aerial Photographs, Water Depths 



Report summarizes the methods developed during World War II to determine water depths 

 near beaches from photos and includes a discussion of the advantages, disadvantages, and 

 errors of each method. In using parallax methods, conventional stereopairs did not give 

 suitable accuracy. Sonne continuous-strip stereo photos were more accurate, and were used 

 extensively. Attempts to use film density were generally unsuccessful with the equipment 

 available during World War II. Wave methods using fundamental equations of wave motion 

 in conjunction with photos taken with a known time lapse are discussed. Wave methods 

 using velocity, period, and refraction were used. Success of any of the three procedures is 

 dependent on good quality photos. A method for determining beach slope that uses a plot 

 of the waterline from photos taken at different stages of the tide is described. 



5010RS0001 

 DICKERSON, LEWIS A., "Stereophotogrammetric Wave Measurement," The Bulletin of 

 the Beach Erosion Board, Vol. 4, No. 4, Oct. 1950, pp. 40-45. 



Keywords: Photogrammetry, Wave Surfaces, Wave Patterns, Atlantic City Beach, New 



Jersey 

 Article discusses two trials conducted by the Army Map Service for the Beach Erosion 

 Board to measure ocean wave characteristics by photogrammetry. The photos used were 

 stereopairs made with two cameras mounted on the Steel Pier at Atlantic City, New Jersey. 

 The primary interest was wave height. The first test was unsuccessful because of unknown 

 camera and orientation elements, although the results were encouraging to justify another 

 trial. The second test produced a three-dimensional model of the water surface in a 

 photogrammetric plotter. However, wave crests concealed the wave trough and heights 

 could not be measured. The conclusion was that it was possible but difficult to use the 

 method. It was also concluded that the technique might be more successful with 

 improvements in the arrangement for taking photos, such as two cameras mounted in one or 

 more low-flying, slow-speed aircraft. 



