Distribution Information 7. Abstract Presettlement vegetation of Minnesota based on Marschner's original analysis of Public Land Survey notes and landscape patterns. Marschner compiled his results in map format, which was subsequently captured in digital format. Attribute Accuracy Existing polygons reflect Marschner's original interpretations, which were based on incomplete information. This data cannot be considered accurate or definitive.
All polygons are closed and lines intersect where intended.
Completeness These data have significant omissions when compared to Marschner's original map. Several thousand small polygons are thought to have been omitted, principally in the prairie and transitional forest areas of the state. Horizontal Positional Accuracy Qualitative positional accuracy comparisons between water bodies in this data and the same features in larger scale sources suggests a range of positional offsets in the range of 500-700 feet as common, with the direction of the offset being variable. These data were developed within the DNR Division of Forestry during the early-mid 1990s. A paper copy of the recompiled Marschner Map was used as the source, with local coordinate registration being established through the use of road and cultural features present on the State Highway Map base used in the recompilation.