NDLI: Effects of within-season dielectric variations on terrain classification using SIR-C/X-SAR

Content Provider	IEEE Xplore Digital Library
Author	Bergen, K.M. Dobson, M.C. Pierce, L.E. Ulaby, F.T.
Copyright Year	1997
Description	Author affiliation: Radiat. Lab., Michigan Univ., Ann Arbor, MI, USA (Bergen, K.M.)
Abstract	The authors investigate the sensitivity of the SIR-C/X-SAR instrument to within-season moisture perturbations for the Michigan Forests Test Site (MFTS). Precipitation events occurred at the conclusion of the October mission and thus analysis of the last four data-takes can demonstrate the relationships between SAR backscatter (/spl sigma//spl deg/) and precipitation at each polarization and frequency. It is expected that backscatter is affected by incident precipitation and that the presence/absence of intercepted precipitation will be found to have the greatest impact at the shorter wavelengths and for vegetation classes characterized by low relative biomass. Four scenes for SRL-2 were acquired at a common viewing geometry (41/spl deg/ angle of incidence) and 24-hour revisit interval. The means and standard deviations are used to measure the sensitivity of feature vectors to intercepted precipitation and soil moisture content conditions. Differences are generated using the October 7 scene (taken before any precipitation events) as the baseline. T-tests are used to determine significance of the differences. Results show (1) that changes in /spl sigma//spl deg/ of agricultural fields are correlated with near-surface soil moisture and (2) changes in /spl sigma//spl deg/ of forested areas corresponds to senescence of deciduous foliage and the competing effects of intercepted precipitation on crown-layer attenuation. Typically, intercepted precipitation changes scattering mechanisms at shorter wavelengths (C-band) and mainly enhances attenuation at L-band. T-tests show these daily differences are commonly significant. Hence, land-cover classifications and biophysical retrieval algorithms must consider these sources of scene variability in /spl sigma//spl deg/.
Starting Page	1072
Ending Page	1074
File Size	335104
Page Count	3
File Format	PDF
ISBN	0780338367
DOI	10.1109/IGARSS.1997.615346
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-08-03
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectrics Layout Backscatter Soil moisture Attenuation Instruments Testing Polarization Frequency Vegetation mapping
Content Type	Text
Resource Type	Article

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