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Instrumented test sites are important calibration and validation references for Earth Observation satellites that measure surface reflectance for a wide range of applications. RadCalNet is a global network of such instrumented sites that meet the requirements of “fiducial reference measurements” (FRMs). These sites make observations of surface reflectance and atmospheric conditions every 30 minutes across the day and provide this to centralised RadCalNet processing to create a top-of-the-atmosphere reflectance product that can be compared with satellite observations. The Aerospace Information Research Institute of the Chinese Academy of Sciences operates two Baotou test sites as part of the RadCalNet Network and has worked with two national metrology institutes (NIM and NPL) to provide traceability and rigorous uncertainty analysis for observations at those sites. The two sites are in the Inner Mongolia Autonomous Region of China, about 50 km from Baotou city. BTCN, at [40.8514°N, 109.6292°E] is an artificial site made of specially selected grey pebbles, and BSCN at [40.8658°N, 109.6155°E] is a natural sandy site. Both sites have autonomous spectrometers in temperature-controlled housings making observations from 400 nm – 1000 nm. The instruments were fully characterised and calibrated at the National Institute for Metrology China (NIM) and uncertainties were evaluated, in collaboration with the National Physical Laboratory (NPL), UK. Here we present the traceability and uncertainty analysis and discuss future extensions of the work to longer wavelengths and to more complex surfaces.
Topic : Theme 1: Earth Energy Balance.
Reference : T1-C16
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