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TIGER data published through February 2007 (2006 Second Edition) were in a custom text-based format formally known as TIGER/Line files. In 2008, data in shapefile format was published. Please note that shapefiles are not topological, therefore may create slivers when comparing TIGER/Line boundaries.
Terrestrial Ecological Systems of the United States: A mid-scale ecological classification of over 800 ecosystems in North America. USGS Gap Analysis Program: The USGS Gap Analysis Program maintains four primary data sets: land cover, protected areas, species and aquatic. The GAP Land Cover Data Set is the most complete map ever produced of ...
As of 2022, there are 588 National Wildlife Refuges in the United States, [1] with the addition of the Green River National Wildlife Refuge. [2] Refuges that have boundaries in multiple states are listed only in the state where the main visitor entrance is located. The newest refuge replaces the Cherry Valley National Wildlife Refuge in ...
This list of Ramsar sites in the United States are those wetlands that are considered to be of international importance, protected under the Ramsar Convention treaty. The United States as of 2020, has 41 sites designated as "Wetlands of International Importance" with a surface area of 1,884,551 hectares (7,276.29 sq mi; 18,845.51 km 2 ).
The National Estuarine Research Reserve System is a network of 30 protected areas established by partnerships between the National Oceanic and Atmospheric Administration (NOAA) and coastal states. The reserves represent different biogeographic regions of the United States. The National Estuarine Research Reserve System protects more than 1.3 ...
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Private and state-owned lands constitute the remaining 67 percent of the border, most of which is located in Texas. [ 1 ] In 1907, Theodore Roosevelt in a Presidential Proclamation (35 Stat. 2136) established the reservation in order to keep all public lands along the border in California, Arizona, and New Mexico "free from obstruction as a ...
Laguna Atascosa National Wildlife Refuge is the largest protected area of natural habitat left in the Lower Rio Grande Valley.The 120,000-acre (49,000 ha) refuge is located almost entirely in Cameron County, Texas, 25 mi (40 km) east of Harlingen, [2] although a very small part of its northernmost point extends into southern Willacy County.