Physics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pgers..42..791w&link_type=abstract
Photogrammetric Engineering and Remote Sensing, vol. 42, June 1976, p. 791-801.
Physics
Illumination, Lunar Photography, Photogrammetry, Stereophotography, Apollo Flights, Cameras, Instrument Errors, Regression Analysis, Solar Position
Scientific paper
Thirty-five metric camera stereomodels from Apollo 15, 16, and 17 lunar missions were analyzed to establish the effect of illumination conditions on the precision of measurements using photogrammetric techniques. Data from all three missions showed a clear inverse relationship between measured standard error and solar elevation angles. Loss of contrast is high at solar elevation angles larger than 30 deg; at elevation angles smaller than 10 deg large areas are in shadow. Similar results are obtained when local slopes and the direction of the sun are taken into consideration. Larger standard errors are measured on slopes tilted towards the sun than on slopes tilted away. Standard errors in Apollo photographs taken at large solar elevation angles rarely exceed the 100-m contour interval used for most lunar topographic maps on a scale of 1:250,000.
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