Directional effects (view angle, sun angle, flight direction) in multi-angular high resolution image data: examples and conclusions from HRSC-AX flight campaigns

Tilman U. Bucher

doi:10.1117/12.514237

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

Tilman U. Bucher

Author Affiliations +

Proceedings Volume 5239, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III; (2004) https://doi.org/10.1117/12.514237
Event: Remote Sensing, 2003, Barcelona, Spain

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.

Citation Download Citation

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); https://doi.org/10.1117/12.514237

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