GaAs can also detect, emit, and convert light into electrical signals, making possible the creation of an integrated opto-electronic chip. Program or device that passes information between networks or applications. A gateway can communicate using two protocols and translates services between the two networks. A mail gateway, for example, translates mail sent from one network into messages traveling over another network. Computer applications used to store and manipulate geographic maps in electronic form.
Raw data is produced from aerial photographs and satellite imagery.
GIS systems often integrate map data and database information about demographics and marketing in the geographical area represented by the map. GIS uses a specialized data and graphics format to store and represent the geographic data. See Graphic Interchange Format. Prefix meaning one billion. Giga- is a prefix used for many units of measurement in the computer and communications industries.