Radarfernerkundung landwirtschaftlicher Flaechen mit einem flugzeugtragenden L-, C- und X-Band Scatterometer

Radar backscattering from soils under different moisture conditions and four types of agricyltural crops was measured during an airbone campaign in July/August 1989. The aim of this experiment was to determine a microwave frequency, that measures soil moisture independently from the vegetation type and cover. Measurements were made in four frequencies L- (1 GHz), C- (5.3 GHz), X- (10 GHz), and Lu-band (15 GHz), and co- and cross-polarized modes. Only the results in L-band show a strong correlation to the soil moisture increase and, furthermore, are independent of the type vegetation cover. As a result of this work, the use of very short wavelengths (such as X- or Ku-band) is suggested to determine the structure of the vegetation canopy. The C-band backscatter information consists of multiple scattering mechanisms from the soil, the moisture in and on the leafs, and the plant geometry which are difficult to determine. L-band on longer wavelengths react - independently from the vegetation cover - directly with the uppermost soil layer. (orig.)SIGLEAvailable from TIB Hannover: RA 9902(3) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman