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Relief effects on the L-band emission of a bare soil

Völksch, Ingo; Schwank, Mike; Stähli, Manfred; Mätzler, Christian

In a combined experimental and model study, we investigated effects of surface topography (relief) on the thermal L-band emission of a sandy soil. To this end, brightness temperatures of two adjacent footprint areas were measured quasi-simultaneously with an L-band radiometer at the observation angle of 55° relative to nadir for one year. One footprint featured a distinct relief in the form of erosion gullies with steep slopes, whereas the surface of the second footprint was smooth. Additionally, hydrometeorological variables, in situ soil moisture and temperature were measured, and digital terrain models of the two scenes were derived from terrestrial laser scanning. A facet model, taking into account the topography of the footprint surfaces as well as the antenna’s directivity, was developed and brightness temperatures of both footprints were simulated based on the hydrometeorological and in situ soil data. We found that brightness temperatures of the footprint with the distinct surface relief were increased at horizontal and decreased at vertical polarization with respect to those of the plane footprint. The simulations showed th ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator DOI: 10.3390/rs71114327
ISSN: 2072-4292
URN: urn:nbn:de:swb:90-AAA1101033868
KITopen ID: 110103386
HGF-Programm 12.02.03; LK 01
Erschienen in Remote sensing
Band 7
Heft 11
Seiten 14327-14359
Lizenz CC BY 4.0: Creative Commons Namensnennung 4.0 International
Schlagworte microwave radiometry, microwave emission model, relief, topography, soil moisture
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