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  2. Projected coordinate system - Wikipedia

    en.wikipedia.org/wiki/Projected_coordinate_system

    Since, in the UK at least, a 6-figure grid reference identifies a square of 100-metre sides, an 8-figure reference would identify a 10-metre square, and a 10-digit reference a 1-metre square. In order to give a standard 6-figure grid reference from a 10-figure GPS readout, the 4th, 5th, 9th and 10th digits must be omitted, so it is important ...

  3. Military Grid Reference System - Wikipedia

    en.wikipedia.org/wiki/Military_Grid_Reference_System

    The Military Grid Reference System (MGRS) [1] is the geocoordinate standard used by NATO militaries for locating points on Earth. The MGRS is derived from the Universal Transverse Mercator (UTM) grid system and the Universal Polar Stereographic (UPS) grid system, but uses a different labeling convention.

  4. United States National Grid - Wikipedia

    en.wikipedia.org/wiki/United_States_National_Grid

    The United States National Grid (USNG) is a multi-purpose location system of grid references used in the United States. It provides a nationally consistent "language of location", optimized for local applications, in a compact, user friendly format. It is similar in design to the national grid reference systems used in other

  5. List of national coordinate reference systems - Wikipedia

    en.wikipedia.org/wiki/List_of_national...

    Given that every projection gives deformations, each country's needs are different in order to reduce these distortions. These national projections, or national Coordinate Reference Systems are officially announced by the relevant national agencies. The list below is a collection of available official national projected Coordinate Reference ...

  6. Template:Ordnance Survey coordinates - Wikipedia

    en.wikipedia.org/wiki/Template:Ordnance_Survey...

    Full "ten figure" grid reference Ireland: i888_999: Letter 'i' followed by two decimal numbers - eastings then northings in metres separated by an underscore R: Standard grid references. In each of these cases, the actual coordinates passed to the map sources page will be the centre of the square that the grid ref defines R16 R1267 R123678 ...

  7. World Geographic Reference System - Wikipedia

    en.wikipedia.org/wiki/World_geographic_reference...

    The World Geographic Reference System (GEOREF) is a geocode, a grid-based method of specifying locations on the surface of the Earth.GEOREF is essentially based on the geographic system of latitude and longitude, but using a simpler and more flexible notation.

  8. Address geocoding - Wikipedia

    en.wikipedia.org/wiki/Address_geocoding

    Military Grid Reference System is the geocoordinate standard used by NATO militaries for locating points on Earth. Universal Transverse Mercator coordinate system is a map projection system for assigning coordinates to locations on the surface of the Earth. the Maidenhead Locator System, popular with radio operators.

  9. Grid (spatial index) - Wikipedia

    en.wikipedia.org/wiki/Grid_(spatial_index)

    A grid-based spatial index has the advantage that the structure of the index can be created first, and data added on an ongoing basis without requiring any change to the index structure; indeed, if a common grid is used by disparate data collecting and indexing activities, such indices can easily be merged from a variety of sources.