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Las imágenes fueron seleccionadas, producidas y georeferenciadas por NED, Leystad, Países Bajos, en Julio de 1999. Eltrabajo se complementó con 3 sobrevuelos utilizando GPS (Geo -posicionador) para cubrir el mayor número de tipos de polígonos y enespecial aquellos en que los especialistas tenían menos conocimientos sobresu tipo de vegetación. 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