Entity and Attribute Information 6. Distribution Information 7. 1997 Currentness Reference Data were derived from a wide variety of image and hardcopy data sources of varying vintages. Browse Graphic File Description Associated Data Sets landfln2 - contains a variety of cartographic symbols created using Autocad such as text leader lines, flow direction arrows, drumlins, lineations etc. The data were scrubbed for validity of codes and code combinations.
All polygons are closed and lines intersect where intended.
The UMD-developed data were developed almost exclusively through review of existing map sources, especially topographic expression as a basis for delineating landforms. This part of the effort did not include a field survey component. DNR conducted fairly extensive manual and automated data reviews during this process in ensure consistency in the product. However, in performing their work, MGS incorporated a variety of other data sources, including some that relied on field survey-verification of interpretations. DNR was the principal party responsible for the development and maintenance of a standard database design and valid codes lists, and coordinating the boundary reconciliation between the two mapping efforts.