A sequential model for disaggregating near-surface soil moisture observations using multi-resolution thermal sensors

作者：Merlin Olivier^*; Al Bitar Ahmad; Walker Jeffrey P; Kerr Yann

来源：Remote Sensing of Environment, 2009, 113(10): 2275-2284.

DOI：10.1016/j.rse.2009.06.012

• Disaggregation
• Soil moisture
• Fractal
• Scaling
• Multi-sensor
• NAFE
• SMOS
• MODIS
• ASTER

A sequential model is developed to disaggregate microwave-derived soil moisture from 40 km to 4 km resolution using MODIS (Moderate Imaging Spectroradiometer) data and subsequently from 4 km to 500 m resolution using ASTER (Advanced Scanning Thermal Emission and Reflection Radiometer) data. The 1 km resolution airborne data collected during the three-week National Airborne Field Experiment 2006 (NAFE'06) are used to simulate the 40 km pixels, and a thermal-based disaggregation algorithm is applied using 1 km resolution MODIS and 100 m resolution ASTER data. The downscaled soil moisture data are subsequently evaluated using a combination of airborne and in situ soil moisture measurements. A key step in the procedure is to identify an optimal downscaling resolution in terms of disaggregation accuracy and sub-pixel soil moisture variability. Very consistent optimal downscaling resolutions are obtained for MODIS aboard Terra, MODIS aboard Aqua and ASTER, which are 4 to 5 times the thermal sensor resolution. The root mean square error between the 500 m resolution sequentially disaggregated and ground-measured soil moisture is 0.062 vol./vol. with a bias of -0.045 vol./vol. and values ranging from 0.08 to 0.40 vol./vol.

• 出版日期2009-10