Radar estimates of soil moisture over the Konza Prairie

Autor:	J. Ampe, A. Budihardjo, Sivaprasad Gogineni
Rok vydání:	1991
Předmět:	Moisture Polarization (waves) Physics::Geophysics law.invention Wavelength law Linear regression General Earth and Planetary Sciences Environmental science Radar Transect Water content Physics::Atmospheric and Oceanic Physics Microwave Remote sensing
Zdroj:	International Journal of Remote Sensing. 12:2425-2432
ISSN:	1366-5901 0143-1161
DOI:	10.1080/01431169108955274
Popis:	Radar-backscatter measurements were made to estimate soil moisture. The helicopter-mounted radar was flown along selected transects that coincided with soil-moisture measurements. The radar operated at microwave frequencies of 5.3 and 9.6 GHz and at selected incidence angles between 0 and 60 degrees. Vertical polarization was used for two days and horizontal polarization was used for three days. The scattering-coefficient data from different days were grouped by frequency and antenna angles and then related to soil moisture along the flight paths using linear regression. A measure of linearity for the regression ranged between 0.9 and 0.5. The larger coefficients were for X-band measurements made at large antenna-incidence angles, and the smaller coefficients were for C-band measurements made at incidences angles near vertical.
Databáze:	OpenAIRE
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