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The systemic validation works were carried out at a watershed scale based on the ground-based observation data of the Heihe Watershed Allied Telemetry Experimental Research (HiWATER). Three validation strategies, scaling-up, spatial representation analysis, footprint analysis were used based on different data acquirement techniques. Some studies were performed and four types of remote sensing products...
Well design and coordinated implementation of validation activity is necessary to evaluate the accuracy of remote sensing product. However, validation is not a straightforward task and remain many challenges. A generally recognized difficult issue is the inconsistence between sparse observations and remote sensing pixels, strong spatial and temporal variations of surface variables, and the intrinsic...
There are many indices, e.g. SEE (Soil Evaporation Efficiency), TVDI (Temperature Vegetation Dryness Index) and ATI (Apparent Thermal Inertia), usually used in downscaling of coarse-resolution soil moisture derived from microwave remote sensing platforms including AMSR-E, FY-3B, SMOS and SMAP so on. However, which index is optimal and what is its applicative conditions still keep unknown. This paper...
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