请问哪位好心人知道 The fundamental of GIS 阿？急！最好是英文的！

http://www.gisdevelopment.net/tutorials/tuman002b.htm

Geographic Information System (GIS) is defined as an information system that is used to input, store, retrieve, manipulate, analyze and output geographically referenced data or geospatial data, in order to support decision making for planning and management of land use, natural resources, environment, transportation, urban facilities, and other administrative records.

The key components of GIS are a computer system, geospatial data and users, as shown in Figure 1.1.

A computer system for GIS consists of hardware, software and procedures designed to support the data capture, processing, analysis, modeling and display of geospatial data.

The sources of geospatial data are digitized maps, aerial photographs, satellite images, statistical tables and other related documents.