Friday, October 31, 2008

GIS and CAD

I posted earlier today about my steps into the realm of 3D CAD. I am also playing with GIS, or Geographic Information System. Essentially that means it is a system that manages geographically related data. If data relates to geography in some way, GIS can be used to display it.

GIS can be used in many fields, so many. Architects, Civil Engineers, Planners, Police, Airlines, Hospitlas, Software Developers, Real esate Sales, Government, Election Workers, Politcal Parties, Miliary, Sales Departments, Health Department, and many many more.

GIS and CAD are two completely different tools. They are used differently, they work differently, and they have different porposes. With CAD, users create the data to make a drawing. With GIS, users turn on the data they want to see to create a drawing. However, there are exceptions to these rules in bot cases of course. Sometimes in CAD, users refernce other drawings (thus turning on the data they want to see) and in GIS they enter the data they want to use.

In CAD, users display geometric data, and in GIS users display geographic data. There are similarities too of course.

Which GIS program have (or do) you used? I have used Mapinfo, Map3D (from Autodesk) and Arcinfo. None of them full time and I am not an expert on any of them. How about you?
Posted by Unknown at Friday, October 31, 2008 Labels:

2 comments:

  1. IgorTheCatNovember 1, 2008 at 11:09 AM

    In 1993 I started on a graduate program in GIS at Cal State Northridge. The tools they used were ArchView, and ArcGIS from a company called ESRI. ESRI is the industry leader in GIS, just as Autodesk is in Architectural CAD.

    GIS is higlhy dependant on using external reference files. The difference is that these files are not created in-house, but are ''called'' from internet sources, like the U.S. Census Beaureau.

    Items that are created buy the developer include north arrows, and various symbols. They have the ability to create lines and polygons to hatch, show propose roads and utilities etc. Existing roads are downloaded from a national street index maintained by some federal agency. I forget whether it is the Census Beaureau, Dept of Commerce, or some other.

    Developers can also create controls for end users to manipulate the data. Ever use MapQuest?

    ReplyDelete
  2. Arshad MirzaNovember 1, 2008 at 9:48 PM

    Autodesk has started there own GIS system MAP 3D and CIVIL 3D
    Now a days I am trying to understand the loogic I need help for how to GEOREFFERNCEing of scanned papers when thay have DEGREE, ', " on the corners
    Can anyone guide me
    Thanks

    ReplyDelete

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