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SPOT 5 Cadastral validation project in Izabal, Guatemala

By M. Corlazzoli A, O. L. Fern and Ez B


Due to the resolution of the former generation of sensors, the use of satellite imagery in the surveying field ha been limited to the construction of pre-cadastral solutions in rural areas. The project principal objective is to establish the potential use of SPOT 5 imagery- with its spatial resolution of 2.5m- as a main source for parcel identification in surveying activities. It was carried out by the UTJ-Protierra, the Guatemalan project in charge cadastral implementation. The different areas of study were selected by their distinct geographical features and cadastral interest. Two types of data were integrated to provide the database; namely SPOT 5 orthoimage and measurements of parcels with total station and GPS equipments. The evaluation was made by comparing the resulted digitised data from traditional measurements and the one from the image identification. The variation of surface between the two datasets was considered very low for extended and medium estates. The variation of the distance between vertices was less than two pixel resolution. Yet, properties in rugged terrain, small agricultural estates and peri-urban properties presented a considerable variation of area and the difference between vertices was less than 10m. The use of the orthoimages as an input for indirect methodology for cadastral projects is adequate for latifundium properties presenting low variation of topography, medium extensions and for planning cadastral activities. In the case of urban centres, steep gradient areas, regions ’ presenting an elevated density of parcel and dense vegetation fences, the use of SPOT orthoimage is limited. 1

Topics: KEY WORDS, Remote sensing, surveying, SPOT, identification, land, orthoimages, accuracy. ABSTRACT
Year: 2011
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