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  2. Contour line - Wikipedia

    en.wikipedia.org/wiki/Contour_line

    A contour line (also isoline, isopleth, isoquant or isarithm) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. [ 1][ 2] It is a plane section of the three-dimensional graph of the function parallel to the -plane. More generally, a contour line for a function ...

  3. Digital geologic mapping - Wikipedia

    en.wikipedia.org/wiki/Digital_geologic_mapping

    The thin red circular contour line in the middle of the map indicates the top of the oil reservoir. Because gas floats above oil, the thin red contour line marks the gas/oil contact zone. Digital geologic mapping is the process by which geological features are observed, analyzed, and recorded in the field and displayed in real-time on a ...

  4. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    In modern mapping, a topographic map or topographic sheet is a type of map characterized by large- scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but historically using a variety of methods. Traditional definitions require a topographic map to show both ...

  5. Terrain cartography - Wikipedia

    en.wikipedia.org/wiki/Terrain_cartography

    USGS topographic map of Stowe, Vermont with contour lines at 20-foot intervals. Terrain cartography or relief mapping is the depiction of the shape of the surface of the Earth on a map, using one or more of several techniques that have been developed. Terrain or relief is an essential aspect of physical geography, and as such its portrayal ...

  6. List of online map services - Wikipedia

    en.wikipedia.org/wiki/List_of_online_map_services

    United States. Apple Maps - covers the whole country. Bing Maps – covers the whole country. Google Maps - covers the whole country. Libre Map Project. MapQuest - covers the whole country. The National Map by the United States Geological Survey. Roadtrippers - covers the whole country. TerraServer-USA - covers the whole country.

  7. Map projection - Wikipedia

    en.wikipedia.org/wiki/Map_projection

    In cartography, a map projection is any of a broad set of transformations employed to represent the curved two-dimensional surface of a globe on a plane. [ 1][ 2][ 3] In a map projection, coordinates, often expressed as latitude and longitude, of locations from the surface of the globe are transformed to coordinates on a plane. [ 4][ 5 ...

  8. Wikipedia:WikiProject Maps/Conventions/Topographic maps

    en.wikipedia.org/wiki/Wikipedia:WikiProject_Maps/...

    Discussions have long for 2-3 years, with several update, to lead to this current web-friendly, screen friendly, and wiki-specific topo style. Leading place and future. Currently, the French team is leading this initiative on its Map Lab, according to Sting's French tutorials, and working according to specific requests.

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