As you get started using ArcGIS, it will be important to understand a few GIS fundamentals and how ArcGIS brings these to life when you use the system. In this section, you will read topics about some key aspects of GIS and how geographic information models are based upon a series of key map concepts.
ArcGIS models geographic information as a logical set of layers or themes. For example, a GIS can contain data layers for the following:
Geographic information layers such as those described here are represented using a few common GIS data structures:
Like map layers, GIS datasets are geographically referenced so that they overlay one another and can be located on the earth's surface.
See Overview of geographic information elements for more information about modeling and representing geographic information.
Each GIS includes a set of intelligent, interactive maps and other views (such as 3D globes) that show features and feature relationships on the earth's surface. Various map views of the underlying geographic information can be constructed and used as windows into the geographic database to support query, analysis, and editing of geographic information. Maps can also be used to access geographic modeling tools that are used to derive new information.
GIS maps are interactive and help to communicate vast amounts of information. You can reach through an interactive map to present any set of information that helps your end users meet their missions and do important work.
See How maps convey geographic information for more information about mapping and visualization.
GIS includes a large set of geoprocessing functions to take information from existing datasets, apply analytic functions, and write results into new result datasets. There are numerous spatial operators, such as the Buffer and Intersect tools shown here, that can be applied to GIS data.
Each geoprocessing tool takes existing information as input and derives a new result, which can be used in subsequent operations. This ability to string together a logical sequence of operations so that you can perform spatial analysis and automate data processing—all by assembling a model—is one of the key elements of GIS.
See Geoprocessing—Computing with geographic data for more information about geoprocessing.