Calculation of reflectance in Landsat OLI-8 images, on the central region of Honduras, using free software SEXTANTE

Abstract

In this research a model for image correction values from ND (Digital Numbers) to physical parameters such as Satellite Reflectance was developed, which reduces errors caused by atmospheric effects. It was used as a working environment for the modeling of algorithms, the free use SEXTANTE Program, which runs on the platform of gvSIG. The methodology used was the calculation of physical quantities for conversion to Top of Atmosphere reflectance (TOA) with angular correction. The model generated serve for calibration of Landsat Satellite Program Operational Land Imager sensor (OLI), and thus strengthen the analysis of remote sensing applied. As validation strategy generated model, its functionality was verified in a research thesis in the postgraduate Master of Planning and Land Management Faculty of Spatial Sciences, under the theme: Multi- Analysis Coverage Earth subwatershed River Mocal, Lempira, Honduras, during the period from 1988 to 2014.The main result was the complete architecture model that calculates the radiometric information from the metadata of Landsat 8 images (OLI).