2.3. Land-cover classification scheme
To derive the land-cover classes in our study area, we devised a
hybrid approach using the land-cover classification scheme proposed
by Anderson et al. (1976) and the vegetation-communities
scheme proposed by CONAFOR in the Mexican national forest inventory
(SARH, 1994). In this study, we used Level I classes that
Anderson et al. (1976) recommended for Landsat type sensors.
Level I classes attempt to describe the general land use represented
by the sensor signal (e.g., water agriculture, urban area, etc.)