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2 Accuracy analyses for land use maps of the 74,712-km Central Atlantic Regional Ecological Test Site were performed for a 1-percent sample of the area. Researchers compared Level II land use maps produced at three scales, 1:24,000, 1:100,000, and 1:250,000 from high-altitude photography, with each other and with point data obtained in the field. They employed the same procedures to determine the accuracy of the Level I land use maps produced at 1:250,000 from high-altitude photography and color-composite ERTS imagery. The accuracy of the Level II maps was 84.9 percent at 1:24,000, 77.4 percent at 1:100,000, and 73.0 percent at 1:250,000. Between 1:23,000 and 1:100,000 the generalization due to the smaller scale was measured as 4.6 percent, and between 1:100,000 and 1:250,000 the generalization was 4.1 percent. The accuracy of the Level I 1:250,000 maps produced from high-altitude aircraft photography was 76.5 percent and for those produced from ERTS imagery was 69.5 percent. The difference in measured land use areas between the aircraft and ERTS maps, resulting from the coarser resolution of ERTS imagery, was 4.6 percent. Accuracy estimates were compared to the costs of producing the maps. The cost of Level II land use mapping at 1:24,000 was found to be high ($11.93 per km^) and was not offset by the slight increase in accuracy. The cost of mapping at 1:100,000 ($1.75) was about 2 times as expensive as mapping at 1:250,000 ($.88), whereas the accuracy increased by only 4.4 percent. Level I land use maps at 1:250,000, when mapped from high-altitude photography, were about 4 times as expensive as the maps produced from ERTS imagery, although the accuracy is 7.0 percent greater. The Level I land use category *» that, is least accurately mapped from ERTS imagery is urban and builtup land in the non-urban areas; in the urbanized areas built-up land is more reliably mapped.

Cost, accuracy, and consistency comparisons of land use maps made from high-altitutde aircraft photography and ERTS imagery