Correcting Topographic Effect on Landsat-8 Images: An Evaluation of Using Different DEMs in Indonesia

摘要

Topographic feature is one of the several factors affecting the distortion of the real reflectance value of objects. Digitalprocessing used the surface reflectance values of satellite imagery needs the corrected images with the most minimizeddisturbances, hence several topographic correction methods using digital elevation data have been developed. This studyexamined the different result of topographic correction from several available elevation data in Indonesia, includingSRTM DEM, topographic map (RBI), and DEMNAS. Sun-Canopy-Sensor+C (SCS+C) correction using different DEMswas applied on Landsat-8 data over Menoreh Mountains, Indonesia. The results obtained showed that DEMNASproduced the most topographically normalized images based on statistical and visual analysis. The availability ofDEMNAS throughout Indonesia is the advantage to be used as an input of this pre-processing method. However, it needsto be examined first since the quality is not surely similar to our study site.