and the United Nations, Food and Agriculture Organization (FAO), to map Mexico's forest cover types. To provide satisfactory AVHRR data sets for the project, the sensor scan angle needed to be calculated for data points in the composite image data, and the clouds had to be removed and composite image data created from indi vidual data sets. Techniques used to accomplish those two tasks are described here. Concepts illustrated here should be applicable to other similar projects. lNTRODUCTlON A

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... pping project was conducted in 1991 at the U.S. Department of Agriculture, Forest Service, Southern For est Experiment Station, Forest lnventory and Analysis (SO-FlA) unit, to create a new forest map of Mexico. The project was part of a global forest assessment program coordinated by the United Nations Food and Agriculture Organization (FAO) and was linked with Mexico's nation wide forest survey effort.