Autodesk 15606-011408-9320 User Guide - Page 171

dynamic layer A layer that gets data from Autodesk MapGuide Server as the user zooms in and out on the map, turns the layer on and off, and so forth. Unlike static layers, which store all of the data for the entire layer in the MWF, dynamic layers download only the data needed for the current view, so the dynamic option is better for layers with large data sets or data that needs to be kept more secure. ellipsoid An approximation of the Earth's shape that does not account for variations caused by non-uniform density of the Earth. extents The smallest rectangle that contains all features in a map, that is, the outermost boundaries of the map. extranet An intranet that is available to authorized users outside of the organization. feature See map feature. field A specific class, or column, of information in a database. For example, in a database of demographic information for countries, one field might be "Country Name," and another might be "Population." geocode Geocode, when used as a noun, refers to the unique key of a map feature (see key). As a verb, to geocode means to assign real-world coordinates to spatial features so that they can be displayed consistently and correctly on a map. Geographic Information System See GIS. georeferencing file (TFW) A file that accompanies a raster image file and tells Autodesk MapGuide Server how to scale and translate the raster image onto the current map. GIS Geographic Information System, an organized collection of computer hardware, software, and geographic data designed to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information. hatch A regular pattern used to fill an area with a series of cross-angled lines. IntelliMouse A pointing device designed by Microsoft that has a wheel control (a rotating wheel that is also a third button). The IntelliMouse provides extended navigational functions in the areas of zooming and panning. It allows you to perform these operations directly from the mouse instead of interacting with navigation controls on the screen. Internet A global collection of linked, independent networks that use the TCP/IP protocol to function as a single large network. The Internet can be accessed by the public. intranet A private network that uses Internet technology but cannot be accessed by the public. If an intranet extends access to authorized users outside of the organization, it is called an extranet. ISAPI Internet Server Application Programming Interface, an interface that allows server applications to work with Microsoft Internet Information Server (Microsoft IIS). If you are using Microsoft IIS as your web server, you can use either the ISAPI or CGI version of the Autodesk MapGuide Server Agent. island An excluded area within the perimeter of a closed polygon. An island can also be an included area outside such a perimeter. A lake in a parcel and an island in a lake are both examples of islands. Glossary | 171