is the process of finding associated geographic coordinates
(often expressed as latitude
) from other geographic data, such as street addresses
, or zip codes
). With geographic coordinates the features can be mapped and entered into Geographic Information Systems
, or the coordinates can be embedded into media such as digital photographs via geotagging
is the opposite: finding an associated textual location such as a street address, from geographic coordinates.
is a piece of software or a (web) service that helps in this process.
A simple method of geocoding is address interpolation
. This method makes use of data from a street geographic information system
where the street network is already mapped within the geographic coordinate space. Each street segment is attributed with address ranges (e.g. house numbers from one segment to the next). Geocoding takes an address, matches it to a street and specific segment (such as a block
, in towns that use the "block" convention). Geocoding then interpolates the position of the address, within the range along the segment.
Take for example: 742 Evergreen Terrace
Let's say that this segment (for instance, a block) of Evergreen Terrace runs from 700 to 799. Even-numbered addresses fall on the east side of Evergreen Terrace, with odd-numbered addresses on the west side of the street. 742 Evergreen Terrace would (probably) be... Read More