GVII-70 
PHOTOGRAMMETRIC ENGINEERING 
herein illustrated shows the need for better planning. Perhaps the International 
Society of Pnotogrammetry or the American Society of Photogrammetry, mak 
ing use of the vast organization, will decide to organize or to set up a committee 
that will study all phases of this problem and that will recommend organized 
approaches to research in fields of photo interpretation. The utilization of past 
studies in this very brief and limited study has caused the author to recommend 
a uniform plot size of 1/5 acre (1/10 hectare) and that these plots be paired 
for studies involving subject matter like volume estimates on aerial photos. 
Other items that influence the variance studies such as variability of volume, 
techniques in photo interpretation, skill of photo interpreters, and quality of 
aerial photos should be controlled so that studies can be compared and our 
knowledge increased. 
Bibliography 
1. Dahl, B., (1954), “Assessment of Standing Timber Volumes from Aerial Photographs, "Austral 
ian Forestry, Vol. XVIII, No. 1, pp. 5-14. 
2. Dilworth, J. Richard, (1955), “Timber Volume Estimating Directly from Aerial Photos,” 
Paper given at section SAF meeting. 
3. Feree, Miles J., (1953), “A Method of Estimating Timber Volumes from Aerial Photographs,” 
College of Forestry, State Univ. of New York, Tech. Pub. jf75. 
4. Losee, S. T. B., (1953), “Timber Estimates from Large Scale Photographs,” Photogrammetric 
Engineering, December, pp. 752-762. 
5. Meyer, H. Arthur and Ginguch, Samuel F., (1955), “Construction of an Aerial Stand Volume 
Table for Upland Oak,” Forest Science, Vol. 1, #2, p. 140. 
6. Moessner, Karl E. and Jensen, Chester E., (1951), “Timber Cruising on Aerial photos,” Central 
States Forest Experiment Station, Columbus, Ohio. Tech. Paper #126. 
7. Pope, Robert, (1950), “Aerial Photo Volume Tables,” Photogrammetric Engineering, Vol. 
6, No. 3, p. 325. 
8. Rogers, Earl J., (1952), “Large Scale Air Photos 'bested in Forest Survey Prove Unsatisfactory,” 
Northeast Forest Experiment Station, Research Note 12.