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Geo-coding
In spatial databases, a coding process wherein a digital map feature is assigned an attribute to serve as a unique ID (tract number, node number) or classification (soil type, zoning category). In polygon processing, the polygon boundary that contains the coordinate pair of a data item (text label) is assigned the value of that data item as "geo-code".

GIF Graphics Interchange Format
The image file format originally developed by CompuServe as a machine-independent image file format. GIF files are a popular way of storing 8 bit, scanned or digitized images, and the compression ratios achieved are commonly better than other 8 bit formats. This format is commonly used in Internet applications.

GPS
Acronym for Global Positioning System, hardware and software designed to communicate with satellites to determine ground location.


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