NDLI: Absolute radiometric correction in rugged terrain: a plea for integrated radar brightness

Content Provider	IEEE Xplore Digital Library
Author	Small, D. Holecz, F. Meier, E. Nuesch, D.
Copyright Year	1998
Description	Author affiliation: Remote Sensing Labs., Zurich Univ., Switzerland (Small, D.)
Abstract	Rigorous intercomparison of multimode SAR imagery requires not only geometric correction (terrain geocoding), but also radiometric normalisation for terrain-induced variations in the local illuminated area caused by differing imaging geometries. Particularly in steep Alpine terrain, foreshortening and layover significantly increase the local illuminated area. Some SAR applications (e.g. biomass estimation) include a science requirement for an absolute radiometric calibration accurate to within 1 dB. Fulfilment of this requirement in areas that are not flat requires compensation for terrain-induced effects. Simple "homomorphic" local incidence angle based radiometric models do not satisfactorily account for the variations; instead an integrative faceted "heteromorphic" SAR image simulation approach is used, whereby simulated SAR images are used to normalise for variations in the area of illuminated terrain. Although radar shadow must be considered in the model as a special case, accounting for the increased area within layover areas requires no extraordinary bookkeeping. A test site providing a wide variety of terrain slopes was selected in Switzerland. RADARSAT imagery are used to illustrate the need for normalisation in preparation for multimode image comparison. The effect of varying the resolution of the reference digital elevation model (DEM) on the normalisation factor is discussed. Pre- and post-correction images are shown, as well as comparisons between simulated SAR images calculated using DEMs of varying resolutions.
Starting Page	330
Ending Page	332
File Size	513241
Page Count	3
File Format	PDF
ISBN	0780344030
DOI	10.1109/IGARSS.1998.702895
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-07-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radiometry Brightness Geometry Radar cross section Radar imaging Calibration Surfaces Azimuth Radar antennas Topology
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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