Abstract
Land surface temperature (LST) products retrieved from two different sensors – AVHRR (Advanced Very High Resolution Radiometer) and MODIS (Moderate Resolution Imaging Spectroradiometer) – were cross-compared. The analysis was conducted on a daily basis for 4 different years. Only pixels that followed a certain homogeneity criteria were chosen. Furthermore a time criterion defining the maximal time difference between two acquisitions was considered. The differences of the two products showed diurnal and annual patterns with LST of AVHRR being higher than MODIS at high surface temperatures and AVHRR being lower than MODIS at lower temperatures. Additionally some irregular patterns were identified and attributed to the different algorithm approaches. However, mean annual absolute differences were relatively low: 2.2 K for the daytime and 1.4 K for the nighttime scenes, indicating a general good agreement between the two products. The r2 between the LST of AVHRR and MODIS for both day and night scenes was about 0.99.
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