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  2. Benchmark (surveying) - Wikipedia

    en.wikipedia.org/wiki/Benchmark_(surveying)

    An Ordnance Survey cut mark in the UK Occasionally a non-vertical face, and a slightly different mark, was used. The term benchmark, bench mark, or survey benchmark originates from the chiseled horizontal marks that surveyors made in stone structures, into which an angle iron could be placed to form a "bench" for a leveling rod, thus ensuring that a leveling rod could be accurately ...

  3. Glossary of geography terms (A–M) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geography_terms...

    A unit of length equal to 66 feet (20.117 m), used especially in public land surveys in the United States; 10 square chains is equal to 1 acre (0.40 hectares). Though the literal chains used to measure this distance have long been superseded, surveying tapes are often still called "chains", and measuring with a tape may be called "chaining".

  4. Survey marker - Wikipedia

    en.wikipedia.org/wiki/Survey_marker

    Survey markers, also called survey marks, survey monuments, or geodetic marks, are objects placed to mark key survey points on the Earth's surface. They are used in geodetic and land surveying . A benchmark is a type of survey marker that indicates elevation ( vertical position ).

  5. Map symbol - Wikipedia

    en.wikipedia.org/wiki/Map_symbol

    Symbols are used to represent geographic phenomena, which exist in, and are represented by, a variety of spatial forms. Different kinds of symbols are used to portray different spatial forms. [1] Phenomena can be categorized a number of ways, but two are most relevant to symbology: ontological form and dimensionality.

  6. List of tripoints of U.S. states - Wikipedia

    en.wikipedia.org/wiki/List_of_tripoints_of_U.S...

    Brass marker with the shapes of the three states is located in a monument box beneath the surface of a rural road. Was set in 1999 [20] and is referenced by a granite marker 20 feet to the east on the Michigan-Ohio line. [21] Iowa: Minnesota: South Dakota

  7. Glossary of geography terms (N–Z) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geography_terms...

    Often called mean sea level (MSL), it is a type of standardized geodetic vertical datum that is used in numerous applications, including surveying, cartography, and navigation. Mean sea level is commonly defined as the midpoint between the mean low and mean high tides at a particular location. [6] sea stack See stack. seabed. Also sea floor or ...

  8. World Geographic Reference System - Wikipedia

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

    These letters form the third and fourth characters of a full GEOREF coordinate. Four letters thus identify any 1-degree quadrangle in the world. Each of the 1-degree quadrangles is further subdivided into 60 1-minute longitude zones, numbered 00 through 59 from west to east, and 60 1-minute latitude bands, numbered 00 to 59 from south to north.

  9. High water mark - Wikipedia

    en.wikipedia.org/wiki/High_water_mark

    This may be a free-standing flood level sign or other marker, or it may be affixed to a building or other structure that was standing at the time of the flood that set the mark. [ 3 ] A high water mark is not necessarily an actual physical mark, [ 4 ] but it is possible for water rising to a high point to leave a lasting physical impression ...

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