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Dalam bahasa Indonesia istilah GIS (Geographic Information System) sering diterjemahkan sebagai Sistem Informasi Geografis yang kemudian disingkat menjadi SIG. Sedangkan beberapa definisi dari GIS dapat kita simak berikut ini.

In the strictest sense, a GIS is a computer system capable of assembling, storing, manipulating, and displaying geographically referenced information, i.e. data identified according to their locations. Practitioners also regard the total GIS as including operating personnel and the data that go into the system.
USGS


A geographic information system (GIS) is a computer-based tool for mapping and analyzing things that exist and events that happen on earth. GIS technology integrates common database operations such as query and statistical analysis with the unique visualization and geographic analysis benefits offered by maps. These abilities distinguish GIS from other information systems and make it valuable to a wide range of public and private enterprises for explaining events, predicting outcomes, and planning strategies.
Environmental Systems Research Institute, Inc.

GIS is a computerized system that facilitates the phases of data entry, data analysis and data presentation especially in cases when we are dealing with georeferenced data.
ITC, 2001


GIS is a computer software system (often including hardware) with which spatial information may be captured, stored, analyzed, displayed, and retrieved.
P.A. Burrough, 1996