Gap Analysis Project (GAP) Land Cover Data
The USGS GAP Land Cover Data Set includes detailed vegetation and land use patterns for the continental United States. The data set incorporates the Ecological System classification system developed by NatureServe to represent natural and semi-natural land cover. The 590 land use classes in the data set can be displayed at three levels of detail, from general (8 classes) to most detailed. The Land Cover Data Set can be used to identify those places in the country with sufficient good quality habitat to support wildlife, a key step in developing sound conservation plans.
The GAP data mainly focuses on habitat identification. The USGS National Land Cover Database (NLCD) is also available and has more detail in developed areas.