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A procedure for the correction of the effect of variation in incidence angle on AIRSAR data

Menges, Carl H., Van Zyl, J. J., Hill, Gregory J. E. and Ahmad, Waqar (2001). A procedure for the correction of the effect of variation in incidence angle on AIRSAR data. International Journal of Remote Sensing,22(5):829-841.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 10 times in Scopus Article | Citations

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Title A procedure for the correction of the effect of variation in incidence angle on AIRSAR data
Author Menges, Carl H.
Van Zyl, J. J.
Hill, Gregory J. E.
Ahmad, Waqar
Journal Name International Journal of Remote Sensing
Publication Date 2001
Volume Number 22
Issue Number 5
ISSN 0143-1161   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0035916905
Start Page 829
End Page 841
Total Pages 13
Place of Publication London, england
Publisher Taylor & Francis
HERDC Category C1 - Journal Article (DEST)
Abstract Radar imaging is a valuable tool for the monitoring and management of tropical ecosystems. One of the obstacles to its successful usage is the variation of the radar backscatter with incidence angle caused by the side-looking mode of the sensor. Available research has modelled the effect of changes in incidence angle for soil, grass and scattering mechanisms in tree-covered areas. The effect varies depending on the scattering mechanism. To model the radar backscatter behaviour of a natural landscape, therefore, implies precise knowledge of the land-cover composition. A method for estimating and correcting the effect of changes in look angle on backscatter data is consequently proposed; it requires little field knowledge and encompasses the effects on most land-cover types in the study area. The method is based on the assumption that each line in azimuth direction contains a similar composition in regard to land-cover types. The backscatter frequency distribution of each azimuth line can then be employed to model and correct for the effect of variation in incidence angle. The results are evaluated using an existing land-cover classification to extract mean backscatter values for individual land-cover classes before and after the correction procedure. The correction procedure is shown to successfully adjust backscatter intensities to a nominal incidence angle for the vegetation communities in a coastal tropical savanna landscape in Australia's Northern Territory.
Keywords radar backscatter
pine stands
bare soil
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