Assinaturas espctrais em depósitos eólicos litorâneos da praia de Caetanos (Itapipoca-CE).

Abstract

The Identification of different generations of a eolian deposits in the region of Praia de Caetanos, municipality of Itapipoca, west coast of Ceará State, was carried out through supervised classification by the parallelepiped method. The aeolian deposits studied are barely perceptible in low spatial resolution images, but were delimited using RapidEye Images. The spatial resolution of these images (5m) made it possible to distinguish the shape and texture these deposits with fieldwork and Image Digital Processing. Although rarely used, the supervised classification by the parallelepiped method provided satisfactory results in distinguishing four types of sampling: eolianites, moving sand dunes, beach stretches, and vegetated areas, the latter including areas of fixed parabolic dunes. Such effectiveness is related to pixels grouped in sets with pre-defined standard deviation, avoiding the classification of pixels whose spectral behavior does not fit in these sets, since this could mask the eolianite bodies, in case those were to be included.