The center of the feature area was compiled and digitized as a point. The same standards for compilation and digitizing used for line data were applied to the development of the special feature symbols layer. A definition of the thematic accuracy measure. Line and area attributes maintained. All incorporated limits shown on USGS quads were digitized.
Logical consistency report The fidelity of the relationships in the data set and the tests used.
Usually limited to cartographic items. Usually limited to cartographic items. A definition of the horizontal positional accuracy measure. Usually limited to cartographic items. Vertical positional accuracy report The accuracy of the vertical coordinate measurements and a description of the tests used.