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13 February 2004 Directional effects (view angle, sun angle, flight direction) in multi-angular high-resolution image data: examples and conclusions from HRSC-A(X) flight campaigns
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Abstract
The High Resolution Stereo Camera (HRSC) is a multiple line "pushbroom" instrument developed by the German Aerospace Center (DLR). Nine super-imposed image tracks are acquired simultaneously by nine parallel CCD-linesensors behind one single optic. Five are panchromatic sensors arranged at specific viewing angles. They provide the multiple-stereo and photometric capabilities of the instrument. Four of the nine CCD-lines are covered with color-filters for the acquisition of multispectral images. The resolution is 10 cm from a flight altitude of 2500 m. The airborne HRSC-A cameras have acquired data for a large number of targets since 1997. Most targets are covered in overlapping flightlines with alternating heading for commercial and photogrammetric considerations. The multi-angular character and directional effects can be observed and differentiated in many flight campaigns: (1) View angle dependent effects in the 5 panchromatic sensors within an individual flightline. (2) Effects due to changes in flight direction (heading alternating 180°, usually one flightline flown perpendicular). (3) Effects due to illumination conditions and changes during the acquisition of the image data (sun elevation, azimuth). (4) Examples and a summary of observed effects are presented. Some potentials and problems of these effects for systematic image processing (e.g. radiometric correction and mosaicking) and interpretation are discussed.
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Tilman U. Bucher "Directional effects (view angle, sun angle, flight direction) in multi-angular high-resolution image data: examples and conclusions from HRSC-A(X) flight campaigns", Proc. SPIE 5239, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III, (13 February 2004); doi: 10.1117/12.514237; https://doi.org/10.1117/12.514237
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