Comparison of surface albedo estimated from LandSat and MODIS image
Subject Areas : Geospatial systems development
Mir Masood Kheirkhah Zarkesh
1
(Assoc. Prof. College of Remote sensing and Geographic Information System, Islamic Azad University, Science and Research Branch, Tehran)
Adel Mahboubian
2
(MSc. Student. College of Remote sensing and Geographic Information System, Islamic Azad University, Science and Research Branch, Tehran)
Homayoun Hesadi
3
(Faculty Member of Agricultural and Natural Resources Center of Kermanshah Province)
Keywords:
Abstract :
Albedo is determined in new and old method based on SEBAL algorithm. In the new method that has been used since 2004, the extracting albedo was based on the experimental models. To determine the albedo of the object to the surface in large-scale and with consideration of the varied topography at the surface, the measurement of object's albedo was impossible, thus they should use remote sensing methods. In this research, the surface albedo was determined by use of ETM+ and MODIS images and tries to compare the obtained results from these two devices in various land uses. To determine the abode, we used the following programs, ERDAS® 9.1 and ArcGIS® 10.1. The result of study shows the average albedo in agricultural land extracted from ETM+ and MODIS images are 0.186 and 0.344, respectively, that the lowest, between all land use categories the highest albedo belonged to watercourse land use with the 0.242. Furthermore, the minimum albedo in follow agriculture in the ETM+ and MODIS image was 0.088, 0.274 and 0.374, 0.464 relatively. By determining albedo in different land use, we can determine the difference between net received energy and use it as one of the factors in determining the evapotranspiration with using the METRIC or SEBAL remote sensing algorithm.
