[Freegis-list] Free GIS for realtime data and 3D visualization?

[Brent Wood]

--- Peter Fischer <peter_7003 at yahoo.com> wrote:

> Hello,
> 
> I have some general questions about what ones can do with free GIS.
> I am not sure whether there is a viewer available to realize the following
> funtionality in conjunction with any free GIS and if yes, how difficult
> that would be: I want to visualize realtime data
> (moving objects) over a map. 


Some options to try:

http://www.open3dgis.org
http://vtk.org
http://www.opendx.org
http://vis5d.sourceforge.net
http://grass.itc.it/

I've used OpenDX, it may be able to do what you want, VTK is more of a toolkit
approach to build your application, so may be more suitable. NVIZ, the 3D
module in GRASS GIS may also be useful.

I suggest you also look at some Open Source 3D gaming alternatives. For
example, the rendering code in FlightGear may be able to be used for your
purposes.


Cheers,

  Brent Wood


> Ideally it would be possible to have a
> perspective view of the map like Google Earth or World Wind. Furthermore,
> it would be nice to be able to select an object on the map (e.g. a building)
> and to show it from the side in 3D (using OpenGL or sth. like that) in a
> separate window. Therefore it should be possible to store such 3D information
> (e.g. of the buildings) in a way to allow to extract the 3D model (based on
> the coordinates on the map when it is selected) and to feed it into the
> 3D viewer.
> 
> So here are my questions in more detail:
> 
> Is there a free GIS with which it is possible (and if yes with what efford)
> to
> 
> 1. get the current camera view via asynchronous events every time the view
> changes? Or do I have to solve that with a polling mechanism?
> - Do you have some sample code doing this, preferably in python?
> 
> 2. display moving overlays
> 
> 3. display movements and directions of 3D Objects in realtime, e.g. 10 fps?
> 
> 4. doing all this using a scripting language like python?
> 
> 5. doing this using standard protocols like TCP/IP or HTTP?
> 
> 6. platform independent (OSes Linux, MacOS, Windows)?
> 
> 7. extend the funtionality via plugins?
> 
> 8. licensing conditions, GPL or sth. like that and having to disclose my
> code?
> 
> 9. support for special input hardware like spacemouse, joystick etc?
> 
> 10. Is there an API?
> 
> 11. What is the resolution for regions like Europe (meters/pixel)? - What is
> the best available and what does it cost?
> 
> You would greatly help me in answering a part of if not all questions
> (which would be awesome!) since I try to figure out whether there is a free
> GIS suitable for a medium sized research project I am working on.
> 
> So if anyone could answer, many thanks in advance and best greetings.
>  
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