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METHOD AND SYSTEM FOR OBTAINING AND AUTOMATICALLY ANALYSING FIELD AND VALIDATION DATA AND/OR CALIBRATING SATELLITE PRODUCTS BY MEANS OF SAID FIELD DATA
WO19175455
Novel method and automatic field-measuring device for the calibration of radiometers on board satellites and/or validation of satellite products. The method allows continuous measurement by TIR radiometry of both variables, LST and TPW, which can serve as key surface and atmospheric data and as ground-truth data for the validation of Earth observation satellite products that are useful for the space sector. The device incorporates in the design a system to perform angular sweeps, both on the land surface and the sky. The system points accurately a TIR radiometer using an accelerometer, which allows, besides a more precise pointing, the obtaining of the TPW, and thus a greater precision in the LST retrieval. The angular system also provides essential data to increase the knowledge of the emissive properties of the observed surfaces. All the observations are done with a single TIR radiometer, so the instrumental cost is much lower than the cost of making such measurements with the usual techniques, avoiding intercomparibility problems as well.
Applications: This invention has a wide range of environmental, meteorological, climatological and water applications, such as estimates of crop productivity and irrigation needs, among many other potential applications. Advantages: The advantages provided by the invention could be summarized in: - better targeting of the device for continuous and autonomous acquisition of accurate directional TIR radiometric data from standard weather stations, thanks to the inclusion of an accelerometer in the angular system - enables continuous TPW data collection in cloudless conditions, even at night, and improves LST data collection with the device - a reduction of the instrumental cost necessary for these purposes, by requiring only one TIR radiometer, - low cost of the device, low power consumption, as it can be powered by photovoltaic systems, and integrability in weather stations.