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The geographic information available includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures and land cover. The National Map is accessible via the Web, as products and services, and as downloadable data. Its uses range from recreation to scientific analysis to emergency ...
The National Geodetic Survey (NGS) is a United States federal agency based in Washington, D.C. that defines and manages a national coordinate system, providing the foundation for transportation and communication, mapping and charting, and a large number of science and engineering applications.
Depths which have been measured are indicated by the numbers shown on the chart. Depths on charts published in most parts of the world use metres. Older charts, as well as those published by the United States government, may use feet or fathoms. Depth contour lines show the shape of underwater relief. Coloured areas of the sea emphasise shallow ...
The official print version is available from the Government Publishing Office. The Factbook is available in website and downloadable formats. It provides a two- to three-page summary of the demographics , geography , communications, government , economy , and military of 266 international entities, [ 2 ] including U.S.-recognized countries ...
Antarctica is the only continental region which does not comprise any geographical subregions or country-level areas. The UNSD geoscheme does not set a standard for the entire United Nations System , and it often differs from geographical definitions used by the autonomous United Nations specialized agencies for their own organizational ...
Map of the United States with state and territory names 1681 map of North America Antebellum map of the United States, published by Sidney E. Morse in An Atlas of the United States (1823), showing the recent acquisition of Missouri and Louisiana, and the remnant of the Northwest Territory after the establishment of Ohio, Indiana and Missouri
Erdkunde publishes scientific articles covering the whole range of physical geography and human geography. The journal offers state of the art reports on recent trends and developments in specific fields of geography and comprehensive and critical reviews of new geographical publications. High-quality maps and large-format supplements are of ...
All projections distort geographic features, distances, and directions in some way. The various map projections that have been developed provide different ways of balancing accuracy and the unavoidable distortion inherent in making world maps. Perhaps the best-known projection is the Mercator Projection, originally designed as a nautical chart.