Many other impoundments were not excluded from the tidal zone because, according to experts, either they were affected by normal tidal action or there is not enough information available to determine the extent of tidal influence. Known impoundments, areas within flood control levees, and upland areas were not included within the tidal zone. Processing follows standard operating procedures as used, developed, and shared by the National Wetlands Inventory of the U.S. Fish and Wildlife Service. This logical consistency report includes information about both general and specific topological tests and data generation dynamics in the fidelity of data. Data is inherently linear.
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. 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. All data crossing the neatline are clipped to the neatline and data within a specified tolerance of the neatline are snapped to the neatline.