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A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC).
Shorter codes are reserved for densely populated areas. The last idea, especially, yields very good results. For example, although every location within the Netherlands can be identified by a 6-letter mapcode, half of the Dutch population can be found in about 40 cities and densely populated areas that together comprise less than 6,000 square ...
There are also mixed systems, using a syntactical partition, where for example the first part (code prefix) is a name-code and the other part (code suffix) is a grid-code. Example: Mapcode entrance to the elevator of the Eiffel Tower in Paris is FR-4J.Q2 , where FR is the name-code [ 9 ] and 4J.Q2 is the grid-code.
The Open Location Code (OLC) is a geocode based on a system of regular grids for identifying an area anywhere on the Earth. [1] It was developed at Google's Zürich engineering office, [2] and released late October 2014. [3] Location codes created by the OLC system are referred to as "plus codes".
Vector maps are especially common among three-dimensional mapping applications and mobile applications. A geocoder indexes map data so that users can search it by name and address or look up an address based on a given coordinate pair (reverse geocoding).
The Denso MapCode system divided Japan into 1162 zones, each zone into 900 blocks, and each block into 900 areas. A Denso MapCode number consists of the zone number (up to 4 digits), the block number (always 3 digits) and the area number (always 3 digits), a numeric code of up to 10 digits.
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Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.