Exact tolerances vary with coverages, as does the date of the processing and testing. The final accuracy values expressed are the best summation which can be developed from the smaller areas which comprise the data set. The actual final should be considered as average and perhaps conservative or over estimating the percent change of error for areas in this data set. Data is inherently polygonal. Polygons intersecting the neatline are closed along the border.
Line segments are a set of sequentially numbered coordinate pairs.
No duplicate features exist nor duplicate points in a data string. Intersecting lines are separated into individual line segments at the points of intersection. Point data are represented by two sets of coordinate pairs, each with the same coordinate values. All nodes are represented by a single coordinate pair which indicates the beginning or end of a line segment. The neatline for each quad is generated by connecting four corners of a digital file, as established during initialization of the digital file.