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Authors: Fornaciai, A.* 
Bisson, M.* 
Mazzarini, F.* 
Title: Detection of Ground Control Points using the SITOGEO- GIS tool to orthorectify Landsat 7 ETM + images
Issue Date: 2008
Series/Report no.: 3/40 (2008)
Keywords: orthorectification
ground control point
Subject Classification05. General::05.01. Computational geophysics::05.01.01. Data processing 
Abstract: Images from the Landsat 7 spacecraft have been widely used in various environmental applications because they are comparatively inexpensive with respect to other satellite data, in addition the panchromatic sensor provides high resolution with a wide coverage area. We present here a orthorectification procedure of Landsat images using the SITOGEO-GIS tool for the GCPs acquisition. Appling this method eighty-five Landsat 7 ETM+ images, covering the entire region of Italy, were orthorectified to the UTM-WGS 84 Geodetic Reference System and organized into a searchable database. Our Landsat images were then compared with the data downloadable from Global Land Cover Facility (GLCF) showing a planimetric discrepancies less than 2 pixels. Moreover this work shows that the best target for GCPs collection is the human-made structures.
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