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Land Surface Temperature from AATSR data: Comparison of Split-window and Single Channel correction methods

Joan Miquel Galve Romero(1), César Coll Company(1), Vicente Caselles Miralles(1), Enric Valor Mico(1), Juan Manuel Sanchez Tomas(1) and Maria Mira Sarrió(1)

(1) University of Valencia, 50, Dr. Moliner, 46100 Burjassot, Spain

Abstract

Land Surface Temperature (LST) can be derived from AATSR data using the Split-window (SW) method with the 11 and 12 microns bands, and using the Single-channel (SC) method wich is based on radiative transfer calculations for the 11 microns band. Both methods were compared over a site of rice fields close to Valencia, Spain, where ground LST measurements were collected concurrently to 28 AATSR overpasses in the period 2002-2007. The SW method applied here is quadratic in the brightness temperature difference between AATSR channels at 11 and 12 micorns, nadir view, and is explicitly dependent on the surface emissivity in both channels. The SC method requires atmospheric profiles of temperature and water vapor over the site, which are used as inputs of the MODTRAN 4 radiative transfer code. The atmospheric profiles were obtained from three sources: local radiosondes at the test site concurrently to AATSR overpasses, satellite-based profile products from the Atmospheric Infrared Sounder (AIRS) on borad EOS/Aqua, and National Centers for Environmetal Prediction (NCEP global thropospherci analysis data which are provided on 1 ° x 1 ° grids every 6 hours. According to the validation results, the SW is the most feasible method with a root mean square error (RMSE) around +/- 0.5 K compared to the error obtained with the SC method that gives an RMSE around +/- 1.0 K. Regarding SC, the worst results are given when AIRS profiles were used (RMSE = +/- 1.3 K) and similar results were obtained for the LR and NCEP profiles.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry