Methods， progresses， and challenges of passive microwave soil moisture spatial downscaling

Passive microwave soil moisture downscaling using evaporative fraction

This paper develops two different approaches for downscaling (disaggregation) passive microwave derived soil moisture from coarse resolution L-band observations. Ground and airborne data collected over Walnut Gulch experimental watershed during the Monsoon ’90 experiment were used to test these approaches. These data consisted of eight micrometeorological stations (METFLUX) and six flights of t...

Hydrological downscaling of soil moisture

Effect of Spatial Scale on Soil Moisture Retrieval From Passive Microwave Sensors

Near-surface soil moisture (SM) retrieval from Lband (1.4 GHz) passive microwave brightness temperature (TB) measurements has been demonstrated from tower and airborne experiments (Wang 1983, Jackson et al. 1999). Current passive microwave techniques for SM retrieval are based on inversion of radiative transfer models which simulate the microwave emission from the earth surface given a specifie...

Comparison of two retrieval methods with combined passive and active microwave remote sensing observations for soil moisture

The brightness temperature (BT) and backscattering coefficient (BSC) measured simultaneously by passive and active microwave sensors have great potential for the estimation of land surface soil moisture (SM). Several methods with combined passive and active microwave remote sensing observations for SM have been reported. Usually, the use of these methods, requires an accurate roughness conditio...

Active and Passive Microwave Sensing of Soil Moisture Throughcorn Fields of Varying Density

This paper explores the synergetics of passive and active microwave remote sensing to determine soil moisture under a corn canopy. An experiment has been performed at Alabama A&M Winfield A. Thomas Agricultural Research Station near Huntsville, Alabama in June, 1998. The fields were observed with a truck-mounted L-, Cand X-band polarimetric radar and a second truck-mounted Land S-band radiomete...