Editing Geographic information system (section)

===Address geocoding===
{{Main|Geocoding}}
Geocoding is interpolating spatial locations (X,Y coordinates) from street addresses or any other spatially referenced data such as [[ZIP&nbsp;Code]]s, [[Land lot|parcel lots]] and address locations. A reference theme is required to [[Geocoding|geocode]] individual addresses, such as a road centerline file with address ranges. The individual address locations have historically been interpolated, or estimated, by examining address ranges along a road segment. These are usually provided in the form of a table or database. The software will then place a dot approximately where that address belongs along the segment of centerline. For example, an address point of 500 will be at the midpoint of a line segment that starts with address&nbsp;1 and ends with address&nbsp;1,000. Geocoding can also be applied against actual parcel data, typically from municipal tax maps. In this case, the result of the geocoding will be an actually positioned space as opposed to an interpolated point. This approach is being increasingly used to provide more precise location information.