Accuracy prediction for the orthophoto mapping process
Abstract
The orthophoto map sheet is a particularly interesting problem in error propagation as there are inherent in the orthophoto generation process several error sources which are systematic functions of terrain type and position on the photograph. The paper discusses the process of determining the probable rejection rate for a map sheet, using as an example the generation of 1/5000 scale orthophoto map sheets. The errors inherent in the generation of orthophoto maps are identified and discussed. A computerbased numerical procedure is proposed for predicting the accuracy of orthophoto mapping relative to a problem of obtaining the probability density function for the sum of several variables having different probability density functions. In this procedure, the possible values of the distribution is broken up into blocks, the value of the error at the center of the block is computed, and the probability of a random point falling in the block is computed. The probability that any given point has a larger error than some value Y is then simply the probability of the point falling into any one of the blocks with error greater than Y.
 Publication:

American Society of Photogrammetry, 42nd Annual Meeting
 Pub Date:
 1976
 Bibcode:
 1976aspg.meet..612G
 Keywords:

 Error Analysis;
 Multivariate Statistical Analysis;
 Orthophotography;
 Photomapping;
 Prediction Analysis Techniques;
 Accuracy;
 Normal Density Functions;
 Probability Density Functions;
 Quality Control;
 Triangulation;
 Instrumentation and Photography