Land Type Associations (LTAs) of Wisconsin represent a further definition of the National Hierarchical Framework of Ecological Units (NHFEU). The NHFEU is an ecological classification system that divides landscapes into ecologically significant regions at multiple scales. Ecological types are classified and units are mapped based on the associations of biotic and environmental factors which include climate, physiography, water, soils, air, hyydrology, and potential natural communities.
This is an archived copy of the data held at UW-Madison. For the most recent version of the data (or current updates) please visit the WI DNR: https://data-wi-dnr.opendata.arcgis.com/datasets/wi-dnr::land-type-associations/about