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Concept
Digital mapping
Résumé
Digital mapping (also called digital or computer cartography) is the process by which a collection of spatial data is compiled and formatted into a virtual image on a computer. The primary function of this technology is to produce maps that give accurate representations of a particular area, detailing major road arteries and other points of interest. The technology also allows the calculation of distances from one place to another.
Although digital mapping can be found in a variety of computer applications the main use of these maps is with the Global Positioning System, or GPS satellite network, used in standard automotive navigation systems.
The roots of digital mapping lie within traditional paper maps such as the Thomas Guide and Geographers' A–Z Street Atlas. Paper maps provide basic landscapes similar to digitized road maps, yet are often cumbersome, cover only a designated area, and lack many specific details such as road blocks. In addition, there is no way to “update” a paper map except to obtain a new version. On the other hand, digital maps, in many cases, can be updated through synchronization with updates from company servers.
Early digital maps had the same basic functionality as paper maps—that is, they provided a “virtual view” of roads generally outlined by the terrain encompassing the surrounding area. However, as digital maps have grown with the expansion of GPS technology in the past decade, live traffic updates, points of interest and service locations have been added to enhance digital maps to be more “user conscious." Traditional “virtual views” are now only part of digital mapping. In many cases, users can choose between virtual maps, satellite (aerial views), and hybrid (a combination of virtual map and aerial views) views. With the ability to update and expand digital mapping devices, newly constructed roads and places can be added to appear on maps. Three-dimensional maps of landscapes can be generated using 3D scanners or 3D reconstruction software.
Source officielle
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