An Open Location Code library for Common Lisp. Open Location Code is a location encoding system for addresses, independent of street names and building numbers. See <https://plus.codes>. The methods requested by the Open Location Code specification are implemented as follows: encode (LATITUDE LONGITUDE) ==> FULL-CODE Convert a latitude and longitude into a 10 digit Open Location Code. encode (LATITUDE LONGITUDE PRECISION) ==> FULL-CODE Convert a latitude and longitude into an arbitrary length Open Location Code. decode (CODE) ==> CODE-AREA Decode an Open Location Code into, at a minimum, the latitude and longitude of the south-west corner and the area's height and width. validp (CODE) ==> boolean Determine if a string is a valid sequence of Open Location Code characters. fullp (CODE) ==> boolean Determine if a string is a valid full Open Location Code. shortp (CODE) ==> boolean Determine if a string is a valid short Open Location Code. shorten (FULL-CODE LATITUDE LONGITUDE) ==> SHORT-CODE Remove four or six digits from the front of an Open Location Code given a reference location. recover (SHORT-CODE LATITUDE LONGITUDE) ==> FULL-CODE Recover a full Open Location Code from a short code and a reference location. See <https://github.com/google/open-location-code/> for more documentation and sample implementations.