Sharing new data layers developed directly from these data would also be appreciated by U.S. Geological Survey, National Wetlands Research Center staff. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. These data are not legal documents and are not to be used as such. The soils map attribute was tested by manual comparison of the original source with hard copy plots. 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. Data completeness for unrevised digital files reflects the content of the source graphic. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. If the digital data underwent limited update version, then the content will include only those features that are photoidentifiable on monoscopic source, supplemented with limited ancillary source, and those features that can not be reliably photoidentified but that are not considered particularly prone to change.