| http://www.w3.org/ns/prov#value | - The horizontal datum used is D North American 1983.The ellipsoid used is GRS 1980.The semi-major axis of the ellipsoid used is 6378137.0.The flattening of the ellipsoid used is 1/298.257222101.How does the data set describe geographic features?OSODBA.ACEC_POLYAreas of Critical Environmental Concern attributed for basic information including designation process, date, and type. (Source: Bureau of L
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