DATA WEIGHTING ANALYSIS.
Final rept. 1967-1968,
RAYTHEON CO ALEXANDRIA VA AUTOMETRIC OPERATION
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The objective of the investigation was to determine what effect the weighting of observed data has on the accuracy of MUSAT aerotriangulation results. In the MUSAT program it is possible to weight three different sets of observations image coordinates, camera parameters, and ground control coordinates. Often, the weights assigned for the aerotriangulation are only estimates and, as such, they may improperly reflect the actual accuracies of the observations. In order to determine the overall effect of improper weighting of observations, this investigation is conducted under carefully controlled conditions using only fictitious data. A clear distinction is maintained between generated weight levels used to randomly perturb the theoretically correct observations and the assigned weight levels used in the MUSAT aerotriangulation program. The two quantities relied upon for reporting results are the RMS values and the propagated standard deviations of the ground coordinates. The RMS values are shown to be primarily dependent on the generated weight levels while the propagated standard deviations are only a function of assigned weight levels. Thus, in general, improper weight assignment will affect aerotriangulation results only slightly. However, without correct weight assignment, the error propagation results will be incorrect. Author
- Cartography and Aerial Photography