期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：Satellite derived estimates of actual evapotranspiration over large areas has become popular in water balance studies since 1990. It is practically impossible to get well-distributed cloud free images over the entire cropping season from one sensor in the tropical countries like the Philippine. This limitation can be overcome with the combination of high-spatial resolution of Landsat, and Terra/Aster images with the high temporal resolution of Terra/Modis images in the tropical climate. This study aimed to test the feasibility of using SEBAL with multi sensors data at different processing levels: ASTER L1A, Landsat 7 ETM+ L1G, and MODIS L1B for the different periods of dry season 2001. The Surface Energy Balance Algorithm for Land (SEBAL) has been applied to ASTER (February 02, 2001), Landsat 7 ETM+ (April 16, 2001), and MODIS (May 18, 2001) sensors for the estimation of evapotranspiration in the District 1 of the Upper Pumapanga River Integrated Irrigation System (UPRIIS), in Central Luzon, of Philippine. All pre-processing and processing steps of all three sensors were discussed in details for SEBAL. Actual evapotranspiration was computed during satellite overpass and integrated for 24-hours on pixel-by-pixel basis. This paper showed a unique combination and inter-relationship of ASTER and Landsat images with the Modis images for the water consumption studies in District 1. The results were compared with the evapotranspiration calculations at two meteorological stations in District 1 and data showed a non-significant variation. Comparison with other meteorological data found close relationship with daily evapotranspiration estimated by different sensors as predicted by SEBAL. From the finding presented, it can be concluded that results from all three remote sensing platforms can be used for the computation of actual evapotranspiration studies in the tropical climate but with necessary precautions
关键词：ASTER; Landsat 7ETM+; MODIS; field evapotranspiration; SEBAL; Central Luzon; UPRIIS; The Philippines
