The classification includes 14 different land cover classes. A signature library of samples collected in the field was developed to assist the classification. More than 1,400 points provided a spectrum of signatures for each land cover type throughout the landscape. Isodata clustering was performed iteratively.
Collateral data help strengthen and verify results throughout the classification process.
Upon completion, more than 800 sites were visited across the geographic boundaries of the scene to ground-truth the final iteration. Landsat TM data has a reported pixel resolution of 30 meters. This means it is difficult to resolve features less than 30 meters. Although sub-pixel analysis was performed during the classification, the 30 meter resolution limitation pertains to the final classified data as well . The final product is available as an ArcInfo grid file.