This paper presents the experiences, results and conclusions of a two year research effort on the feasibility of updating Land Use-Land Cover maps through digital processing of Landsat data. The project has been conducted by the Dirección General de Geograffa del Territorio Nacional (DGGTN), which has in charge the realization of the natural - resources inventory of Mexico's National Territory.

Several approaches for developing training statistics were used, and their advantages and shortcomings are discussed. A classification scheme and a general outline of an operational procedure for updating our Agricultural, Forest and Range Resource Inventory is presented.

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