CAD vs. GIS. Fabian Guerrero 10/2007. What is the difference between Graphical Interface Systems (GIS) and Computer Aided Drafting (CAD) anyway?. Overview:. GIS Description GIS Examples GIS File Extensions CAD Description CAD Examples CAD Estensions Data Layers Model Summary Conclusion
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Fabian Guerrero 10/2007
USGS: Graphical Information Systems (2007) Retrieved 9, October 2007, Web site: http://erg.usgs.gov/isb/pubs/gis_poster/
This vector data model represents real-world features as points, lines, and polygons whose boundaries are defined by x,y coordinate pairs.
Whatis?com: Definitions – What is CAD (2007) Retrieved 29-October, 2007 Web site: http://whatis.techtarget.com/sDefinition/0,,sid9_gci211732,00.html
These CAD drawings illustrate how lines are layered to create a precision “how-to” in a referenced space. At left is a 3-D model rendering of a motorcycle.
The difference between CAD and GIS systems is becoming blurred with the internal attributes and database linkages enhancing CAD’s capabilities.
GIS is a database program, and CAD is a graphics program. With CAD, it's the lines that are important, i.e. the drawing is the information. With GIS, the lines are just a representation of the data behind it.