Skip to main content

A to B

Acetate layer:

An acetate layer is a custom layer to which a user can add objects for example. points or draw objects such as polygons or lines, these objects may then be annotated by the user. The layer list does not add an acetate layer to the layer collection and the acetate layer does not represent any data set (

Active Layer:

This is the GIS data layer from which features can be identified, queried, searched for or selected. Image layers cannot be activated and only one layer can be activated at a time. To make a layer active, the name of the layer in the layer list must be selected (clicked on) (

Apple (Macintosh):

Apple Macintosh is a family of personal computers manufactured by Apple Computer, Inc. The Macintosh, (commonly called the "Mac") was the first successful implementation of the graphical user interface, which is now an industry standard. Apple is known for its innovative, well-designed hardware, such as the iPod and iMac, as well as software such as iTunes, part of the iLife suite, and Mac OS X, its current operating system (


ARC IMS is a solution for delivering dynamic maps and services and GIS data via the web. ARC IMS provides a highly scalable framework for GIS web publishing that is needed by corporate Intranets and meets the demands of worldwide Internet access. A wide range of clients and custom web applications can use it (


Active Server Pages (ASP) is Microsoft's server-side technology for dynamically-generated web pages that is marketed as an add-on to Internet Information Services (IIS) (


An attribute is information about a geographic feature in a GIS and is normally stored in a table and linked to the feature by an identifier. Information in the attribute tables can be accessed with the Identify, Search and Select tools (


In a GIS an annotation is descriptive text, which is used to label coverage features (


Bandwidth is the maximum data-carrying capability of a point-to-point telecommunications connection as a result of the range of frequencies available to be occupied by signals, usually expressed in terms of Hertz (Hz) in analogue systems and as the number of bits per second in digital systems.



An electronic bookmark is similar to a paper bookmark and is used to remind the user with which page they were busy. An electronic bookmark is used to bring the user back to a particular website or place on a page of text when they wish to return there (


Broadband in general refers to data transmission where multiple pieces of data are sent simultaneously to increase the effective rate of transmission. In network engineering this term is used for methods where two or more signals share a medium. While many lower rate forms of data transmission, such as analog modems above 600 bit/s, are broadband, broadband has been more closely associated with higher data rate forms of broadband data transmission such as T-carrier and Digital Subscriber Lines. Therefore, the word "broadband" has also come to mean a relatively high rate, while the term "narrowband" is used to mean a relatively low rate (


An Internet Browser interprets HTML, which is the programming language of the World Wide Web into words and graphics when the user views a web page. Microsoft's Internet browser is the most common browser, which controls 80% of the market. Other browsers include Mozilla FireFox, Opera, Konqueror, Safari and Netscape (


A buffer is a polygon enclosing a point, line, or another polygon at a specified distance.


A button is a graphical representation of an electrical push-button appearing as part of a Graphical User Interface of a software application. Clicking on a button starts some software action (