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Their map purported to show finer detail, for example, reflecting urban heat islands by showing the downtown areas of several cities (e.g., Baltimore, Maryland; Washington, D.C., and Atlantic City, New Jersey) as a full zone warmer than outlying areas. The map excluded the detailed a/b half-zones introduced in the USDA's 1990 map, an omission ...
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Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone. In temperate latitudes, the term most often describes resistance to cold, or "cold-hardiness", and is generally measured by the lowest temperature a plant can withstand.
Some jurisdictions further subdivide agricultural zones to distinguish industrial farming from uses like rural residence farms and retirement farms on large lots. [3] One example of such zoning is the Agricultural Reserve in Montgomery County, Maryland. The reserve was established in 1980 to preserve farmland and rural space. [4]
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
USDA plant hardiness zone regional map - North Central US. The climate is humid continental, displaying both the cool summer and warm summer subtypes as one travels from north to south. [24] The United States Department of Agriculture has the region falling mainly in zone 5a, with the northern fringe being 4b. A few patches in Wisconsin are 4a.
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