6 days ago · The National Park System of the United States is the collection of physical properties owned or administered by the National Park Service. The collection includes all national parks and most national monuments, as well as several other types of protected areas of the United States.
4 days ago · The United States has 63 protected areas known as national parks that are operated by the National Park Service, an agency of the Department of the Interior.National parks must be established by an act of the United States Congress.
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6 days ago · An ultra-prominent summit is a summit with at least 1500 meters (4921 feet) of topographic prominence. There are 126 ultra-prominent summits in the United States. All elevations include an adjustment from the National Geodetic Vertical Datum of 1929 to the North American Vertical Datum of 1988 .
Jun 03, 2021 · As part of The National Map, structures include schools, hospitals, post offices, police stations, cemeteries, and other important public buildings.By updating and verifying structures data, volunteers are making significant contributions to USGS National Structures Database, The National Map, and ultimately U.S. Topo Maps!
6 days ago · This is a list of satellites and spacecraft which have been given USA designations by the United States Air Force.These designations have been applied to most US military satellites since 1984, and replaced the earlier OPS designation.
2 days ago · The flag of the United States of America, often referred to as the American flag or the U.S. flag, is the national flag of the United States.It consists of thirteen equal horizontal stripes of red (top and bottom) alternating with white, with a blue rectangle in the canton (referred to specifically as the "union") bearing fifty small, white, five-pointed stars arranged in nine offset ...
6 days ago · Speed limits in the United States are always in miles per hour. Metric speed limit signs in kilometers per hour are authorized but extremely rare, usually seen near the borders with Canada and Mexico , both of which use the metric system . 
6 days ago · The National Highway System (French: Réseau routier national) in Canada is a federal designation for a strategic transport network of highways and freeways. The system includes but is not limited to the Trans-Canada Highway, and currently consists of 38,021 kilometres (23,625 mi) of roadway designated under one of three classes: Core Routes, Feeder Routes, and Northern and Remote Routes.
Jun 02, 2021 · The National Levee Database's core mapping data can be used in GIS desktop and web apps via the Web-GIS Service URLs below. Use these services to add NLD data to your maps, change layers styles and export selected features. The NLD's WMS and WFS services use the "ows_" metadata reference in lieu of "wms_" and "wfs_", which allows a single ...