Analysis of Topographic Effects on SIR-B Imagery: Correlation of Image Intensity with Local Incidence Angles

Masaharu FUJITA
Nobuyoshi FUGONO

IEICE TRANSACTIONS on Communications   Vol.E75-B    No.11    pp.1220-1226
Publication Date: 1992/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
SAR,  topographic effect,  

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Dependence of SIR-B image intensity on local incidence angles has been investigated to estimate quantitatively topographic effects in SAR imagery. Local incidence angles were computed from a digital elevation model (DEM) produced from a topographical map. Slope images representing the variation of local incidence angles of a hilly area were compared with the SIR-B images. Since the studied area is uniformly covered by shrubs and grass, the topograghic effect can be easily detected. Based on the topographic effects, backscattering coefficients (σ0) of the hilly area were estimated and compared with the existing σ0 data base.