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File: readme_PlusCode.txt

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File: readme_PlusCode.txt
Role: Documentation
Content type: text/plain
Description: Readme
Class: PHP PlusCode
Generate PlusCode parameters for Google Maps links
Author: By
Last change: Tidy up
Date: 4 years ago
Size: 1,555 bytes
 

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Class PlusCode This is a lightweight implementation of the Open Location Code (aka Google Plus-Code) which gives location information to places that may not have street names or addresses. Like Nepal, for example. These links give background information about the motivation and the design of the Open Location Code https://en.wikipedia.org/wiki/Open_Location_Code https://github.com/google/open-location-code/blob/master/docs/olc_definition.adoc https://github.com/google/open-location-code/blob/master/docs/olc_definition.adoc#open-location-code-specification Latitude Distance from the Equator 90 N == 90 North Pole 90 S == -90 South Pole Longitude Distance from Prime Meridian (Greenwich) 180 W == -180 180 E == 180 180 from Greenwich in either direction is "antimeridian" The OLC is computed from the south pole (latitude -90) and the antimeridian (longitude -180). Its computation requires positive values so we add 90 and 180 to the latitude and longitude, respectively. The resulting values are expressed in base-20 notation using a character set that is designed to produce no words. The Class provides two static methods. geocode_to_olc() takes a lat,lng pair and returns a Plus Code olc_to_geocode() takes a full Plus Code and returns the lat,lng pair A Plus Code generated by the Class provides "roof-top accuracy." It is possible to get greater accuracy by adding an eleventh character to the Plus Code, but that is not implemented in this lightweight example.