This article presents the results of mapping and monitoring of Tapajós National Forest (PA), one of the test area of LBA “Large Scale Biosphere-Atmosphere Experiment in Amazônia” Project, through the development of a geographic database. Remote sensing images (Landsat 1988, 1997, 1999 e 2001; RADARSAT 2002; Hyperion 2001; and aerial Videography 1999 and 2000), forest inventories of large sampling intensity and ancillary informations (thematic maps, topographic charts and annual cumulative precipitation data) were employed as information layers of the database. Through the integration of these informations, it was possible to produce a map of land cover for the Tapajós National Forest region and to evaluate its natural conservation.