![]() ![]() Example: country codes use two letters of the alphabet (chacacter set A-Z). geocode syntax: the characters that can be used, blocks of characters and its size and order.The syntax and semantic of the geocodes are also components of the system definition: The set of all geocodes used as unique identifiers of the cells of a full-coverage of the geographic surface (or any well-defined area like a country or the oceans), is a geocode system (also named geocode scheme). Scope of use: general use vs specialized (e.g.some non-standard geographic entities, can be classified also by its coordinate system and elipsoid of reference (e.g.special hierarchical grids, with global covering and equal-area cells, can be classified as DGGS cell.Point (the geocode can be translated to a Geo URI), grid cell (the geocode system is related with a DGG) or polygon (typically administrative boundaries delimitations). Type of the represented entity: type of geometry.only terrestrial areas) or by the ownership's jurisdiction (e.g. geographical points) or is delimited the theme (e.g. The entities (represented by the geocodes) are in all globe (e. A geocode system can hierarchical ( name or grid) or non-hierarchical. Hierarchy: geocode's syntax hierarchy corresponding to the spatial hierarchy of its represented entities.See geocode system types below (of names and of grids). abbreviation of official name the country) or from mathematical function ( encoding algorithm to compress latitude-longitude). Formation: the geocode can be originated from a name (ex.Ownership: proprietary or free, differing by its licences.There are some common aspects of many geocodes (or geocode systems) that can be used as classification criteria: A museum is a typical location to be pointed by a geocode, its gate need ~20 meters of precision. ![]() Geocode cells of Geohash, with 8 (blue) and 9 (yellow) digits, a typical hierarchical grid, comparing with latitude-longitude (12 or more digits). In theoretical computer science a geocode system is a locality-preserving hashing function. Geocodes are mainly used (in general as an atomic data type) for labelling, data integrity, geotagging and spatial indexing. For example, for ISO, the country name “People's Republic of China” is a label. The ISO 19112:2019 standard (section 3.1.2) adopted the term "geographic identifier" instead geocode, to encompass long labels: spatial reference in the form of a label or code that identifies a location. 70040 represents a Brazilian's central area for postal distribution). Polygon of a postal area: a CEP code (e.g. ~0.023 km 2 cell 6vjyngd at the Brazilian's center) or an OLC code (e.g. Identifier of a cell of a discrete global grid: a Geohash code (e.g. AF-GHO for Ghor province) or BR subdivision codes (e.g. AF for Afghanistan or BR for Brazil), and its subdivision conventions, such as AF subdivision codes (e.g. The main examples are ISO codes: ISO 3166-1 alpha-2 code (e.g. Polygon of the administrative boundaries of a country or a subdivision. Typical geocodes and entities represented by it: In general the geocode is a human-readable and short identifier. It is a unique identifier of the entity, to distinguish it from others in a finite set of geographic entities. Not to be confused with Address geocoding.Ī geocode is a code that represents a geographic entity ( location or object). ![]()
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