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  2. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5-minute grid, they are often called or quads or quadrangles. Topographic maps conventionally show topography, or land contours, by means of contour lines.

  3. Contour line - Wikipedia

    en.wikipedia.org/wiki/Contour_line

    A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes. [4] The contour interval of a contour map is the difference in elevation between successive contour lines. [5] The gradient of the function is always perpendicular to the contour ...

  4. Terrain cartography - Wikipedia

    en.wikipedia.org/wiki/Terrain_cartography

    Siegfried map of Bernina Pass (1877) with black, blue and brown contour lines at 30-meter intervals. On maps produced by Swisstopo, the color of the contour lines is used to indicate the type of ground: black for bare rock and scree, blue for ice and underwater contours, and brown for earth-covered ground. [4]

  5. List of online map services - Wikipedia

    en.wikipedia.org/wiki/List_of_online_map_services

    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; Uzbekistan. 2GIS, by 2GIS. Vietnam "Vietbando Maps", by Vietbando. "Vinalo Maps", Vinalo. See also

  6. Topography - Wikipedia

    en.wikipedia.org/wiki/Topography

    A topographic map of Stowe, Vermont with contour lines This false-color satellite image illustrates topography of the urban core of the New York metropolitan area, with Manhattan at its center. Topography is the study of the forms and features of land surfaces .

  7. Google Earth - Wikipedia

    en.wikipedia.org/wiki/Google_Earth

    Google Earth is a web and computer program that renders a 3D representation of Earth based primarily on satellite imagery.The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles.

  8. 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 ...

  9. History of cartography - Wikipedia

    en.wikipedia.org/wiki/History_of_cartography

    The earliest maps ignored the curvature of Earth's surface, both because the shape of the Earth was uncertain and because the curvature is not important across the small areas being mapped. However, since the age of Classical Greece , maps of large regions, and especially of the world, have used projection from a model globe to control how the ...