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The history of longitude describes the centuries-long effort by astronomers, cartographers and navigators to discover a means of determining the longitude of any given place on Earth. The measurement of longitude is important to both cartography and navigation. In particular, for safe ocean navigation, knowledge of both latitude and longitude ...
Allows you to find coordinates with a place name search. Licensing: Geonet Names Server (GNS) Name search: U.S. National Geospatial-Intelligence Agency (NGA) maintains a comprehensive database of non-U.S. place data. The Libre Map Project: The purpose of the project is to aggregate and make digital maps and related GIS data available for free.
OpenStreetMap (OSM) is a free, open geographic database updated and maintained by a community of volunteers via open collaboration.Contributors collect data from surveys, trace from aerial imagery and also import from other freely licensed geodata sources.
The Open Location Code ( OLC) is a geocode based in a system of regular grids for identifying an area anywhere on the Earth. [ 1] It was developed at Google's Zürich engineering office, [ 2] and released late October 2014. [ 3] Location codes created by the OLC system are referred to as " plus codes ".
v. t. e. A geographic coordinate system ( GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude. [ 1] It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.
v. t. e. A projected coordinate system – also called a projected coordinate reference system, planar coordinate system, or grid reference system – is a type of spatial reference system that represents locations on Earth using Cartesian coordinates ( x, y) on a planar surface created by a particular map projection. [ 1]
Ecliptic longitude Ecliptic longitude or celestial longitude (symbols: heliocentric l, geocentric λ) measures the angular distance of an object along the ecliptic from the primary direction. Like right ascension in the equatorial coordinate system, the primary direction (0° ecliptic longitude) points from the Earth towards the Sun at the ...
Geodesy. A spatial reference system ( SRS) or coordinate reference system ( CRS) is a framework used to precisely measure locations on the surface of Earth as coordinates. It is thus the application of the abstract mathematics of coordinate systems and analytic geometry to geographic space. A particular SRS specification (for example ...
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