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  2. 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 ...

  3. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    Sergeant Chris D. Washington checking his Topographic map during a morning deer hunt in Kilgore, Texas A topographic map of Stowe, Vermont with contour lines Part of the same map in a perspective shaded relief view illustrating how the contour lines follow the terrain Sheet #535 (2013 version; second digital edition) of MTN50 Spanish National Topographic map series, covering Algete town (near ...

  4. Topography - Wikipedia

    en.wikipedia.org/wiki/Topography

    A map of Europe using elevation modeling. In its contemporary definition, topographic mapping shows relief. In the United States, USGS topographic maps show relief using contour lines. The USGS calls maps based on topographic surveys, but without contours, "planimetric maps."

  5. Terrain cartography - Wikipedia

    en.wikipedia.org/wiki/Terrain_cartography

    The Tanaka (relief) contours technique is a method used to illuminate contour lines in order to help visualize terrain. Lines are highlighted or shaded depending on their relationship to a light source in the Northwest. If the object being illustrated would shadow a section of contour line, that contour would be represented with a black band.

  6. Bathymetry - Wikipedia

    en.wikipedia.org/wiki/Bathymetry

    Topographic maps display elevation above ground and are complementary to bathymetric charts. Bathymetric charts showcase depth using a series of lines and points at equal intervals, called depth contours or isobaths (a type of contour line). A closed shape with increasingly smaller shapes inside of it can indicate an ocean trench or a seamount ...

  7. Topographic prominence - Wikipedia

    en.wikipedia.org/wiki/Topographic_prominence

    Since topographic maps typically show elevation using contour lines, the exact elevation is typically bounded by an upper and lower contour, and not specified exactly. Prominence calculations may use the high contour (giving in a pessimistic estimate [ 10 ] [ 11 ] ), the low contour (giving an optimistic estimate), their mean (giving a ...

  8. Watershed delineation - Wikipedia

    en.wikipedia.org/wiki/Watershed_delineation

    In the 1980s and 1990s, digital elevation models were often obtained by scanning and digitizing the contours on paper topographic maps, which were then converted to a TIN or a gridded DEM. [13] More recently, the DEM is obtained by aerial or satellite remote sensing, using stereophotogrammetry, lidar, or radar. [14]

  9. Bathymetric chart - Wikipedia

    en.wikipedia.org/wiki/Bathymetric_chart

    Topographic maps display elevation above ground and are complementary to bathymetric charts. Bathymetric charts showcase depth using a series of lines and points at equal intervals, called depth contours or isobaths (a type of contour line). A closed shape with increasingly smaller shapes inside of it can indicate an ocean trench or a seamount ...

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