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Land Surface Temperature
The hourly LST Version 1 has been validated according to the procedure applied by the EUMETSAT Land Surface Analysis Satellite Application Facility (LSA-SAF). It consists in a spatial consistency analysis at global scale, comparison with similar products from different sensors, and direct comparison with ground measurements. The validation procedure and results can be found in the Validation Report.
The main added-value of the hourly LST product is the description of the diurnal cycle (Figure below) which is not provided by other EO-derived LST products (e.g. AVHRR LST or MODIS LST). The hourly sampling of the geostationary-derived LST is a key factor when observing regularly cloudy areas, where low observation frequencies may seriously limit LST availability.
Daily LST time series, with the respective error bars, compared with in situ measurements over some BSRN and SURFRAD stations.
The accuracy assessment is updated every year using the most recent ground reference data available. From 2018 exercise onwards, robust statistics are used for the validation of LST products, as recommended by the CEOS Land Product Validation (LPV) subgroup. The results obtained on the 2018 LST products, which cover the Americas with the GOES-16 data, are presented in the 2018 Validation Report. In addition, it is checked that the LST products capture well the impact of some environmental events on vegetation, like heat waves, cold spells or large fires.
LST anomaly (K) for 6 dekads, with respect to the 8-year mean (2010-2017) for the 2018 heat wave in Europe.
LST anomaly (K) for 6 dekads, with respect to the 8-year mean (2010-2017) for the cold spell generated by the anti-cyclone Hartmut over Europe in February and March 2018.
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LST anomaly with respect to the 7-year mean (2010-2016) for one pixel affected by fire (red) and its neighbour not affected by fire (blue) in Chile (January 2017, top) and Portugal (June 2017, bottom).
The main limitation of the product is that Central Asia is not covered. Evolution is in progress to include the Meteosat Second Generation (MSG) mission over the Indian Ocean to improve the spatial coverage.
According to the results of these assessments, the hourly LST products are in “operational” stage.
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