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  2. Multiview orthographic projection - Wikipedia

    en.wikipedia.org/wiki/Multiview_orthographic...

    A building elevation is typically labeled in relation to the compass direction it faces; the direction from which a person views it. E.g. the North Elevation of a building is the side that most closely faces true north on the compass. [2] Interior elevations are used to show details such as millwork and trim configurations.

  3. National Geodetic Vertical Datum of 1929 - Wikipedia

    en.wikipedia.org/wiki/National_Geodetic_Vertical...

    The National Geodetic Vertical Datum of 1929 is the official name since 1973 [1] of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. Originally known as Sea Level Datum of 1929, NGVD 29 was determined and published by the United States Coast and Geodetic Survey [2 ...

  4. North American Vertical Datum of 1988 - Wikipedia

    en.wikipedia.org/wiki/North_American_Vertical...

    The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988. [1]

  5. Digital elevation model - Wikipedia

    en.wikipedia.org/wiki/Digital_elevation_model

    A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid. A "global DEM" refers to a discrete global grid. DEMs are used often in geographic information systems (GIS), and are the most common basis ...

  6. 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]

  7. 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 ...

  8. Vertical datum - Wikipedia

    en.wikipedia.org/wiki/Vertical_datum

    In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation. In planetary science, vertical datums are ...

  9. Terrain cartography - Wikipedia

    en.wikipedia.org/wiki/Terrain_cartography

    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 ...

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