Currentness Reference LTA polygons reflect landscape-scale physical characteristics that are relatively resistant to changes due to land use practices. Therefore, LTA boundaries are relatively stable, but will reflect conditions portrayed in the parent data sets. The data used to interpret these characteristics were of 1994 to 1997 vintage. As new data becomes available, LTA boundaries will be refined. The data is strongly correlated with the delineations present in the Geomorphology of Minnesota data set.
All polygons are closed and lines intersect where intended.
Completeness Data are complete within the borders of Minnesota. In addition, boundaries have been edge-matched with LTA mapping in Wisconsin. Brief descriptions of the central concepts for each LTA are in progress. Not Applicable Lineage LTA's were delineated by manually interpreting a variety of land surface information including topography, wetland distributions, soil characteristics, Hydrography, presettlement vegetation, bedrock type, Landsat satellite imagery, geomorphology and local knowledge of the landscape from individuals on six landscape teams. The interrelationship of features were examined by overlaying thematic maps and observing how patterns coincide.