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  2. Radar horizon - Wikipedia

    en.wikipedia.org/wiki/Radar_horizon

    The Clear Region is the zone that begins several kilometers beyond the radar horizon at low elevation angles. The clear region is also the zone above low elevation angles with clear skies. There is no clear region in areas with weather and heavy biological activity (rain, snow, hail, high winds, and migration).

  3. Hypsometry - Wikipedia

    en.wikipedia.org/wiki/Hypsometry

    Hypsometry (from Ancient Greek ὕψος (húpsos) 'height' and μέτρον (métron) 'measure') [1] [2] is the measurement of the elevation and depth of features of Earth's surface relative to mean sea level. [3] On Earth, the elevations can take on either positive or negative (below sea level) values.

  4. DTED - Wikipedia

    en.wikipedia.org/wiki/DTED

    DTED (or Digital Terrain Elevation Data) is a standard of digital datasets which consists of a matrix of terrain elevation values, i.e., a Digital Elevation Model.This standard was originally developed in the 1970s to support aircraft radar simulation and prediction.

  5. World Geodetic System - Wikipedia

    en.wikipedia.org/wiki/World_Geodetic_System

    The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS.The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM).

  6. Elevation Earth for iOS is endlessly fascinating and educational

    www.aol.com/news/2014-03-25-elevation-earth-for...

    Elevation Earth is a universal iOS app (US$2.99) that displays a 3D model of our planet. You can manipulate your location with finger movements on the screen while rotating and zooming into Earth ...

  7. Terrain cartography - Wikipedia

    en.wikipedia.org/wiki/Terrain_cartography

    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 presents a central problem in cartographic design , and more recently geographic ...

  8. Geodetic datum - Wikipedia

    en.wikipedia.org/wiki/Geodetic_datum

    A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global datum reference or reference frame for unambiguously representing the position of locations on Earth by means of either geodetic coordinates (and related vertical coordinates) or geocentric coordinates. [1]

  9. List of elevation extremes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_elevation_extremes...

    The following sortable table lists land surface elevation extremes by country or dependent territory. Topographic elevation is the vertical distance above the reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface.