InfraWorks General Discussion

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Distinguished Contributor
jmaeding
Posts: 954
Registered: ‎12-27-2006
Message 1 of 10 (914 Views)
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Can AIM model curvature of the earth?

914 Views, 9 Replies
09-18-2012 04:08 PM

I know it uses a tin surface, which cannot wrap under itself, but if I choose a coordinate system like UTM 11, will it drape that surface around a globe? (like google earth)

any suggestions on tools that can do that besides google earth?

I have arcscene and manifold gis progs, just never cared about the effects of earth curvature on what  given viewpoint can see.

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spatialguru
Posts: 12
Registered: ‎05-12-2011
Message 2 of 10 (908 Views)

Re: Can AIM model curvature of the earth?

09-18-2012 08:56 PM in reply to: jmaeding

The two that come to mind are ossimPlanet and WorldWind (though I don't know WW really much at all).  ossimPlanet is totally built on a global model and can do some great stuff.  You'll probably want to extend it further for your particular solution but it might be more inspiring than google earth at this point.

 

Enjoy!

 

http://trac.osgeo.org/ossim/wiki/OssimPlanet

http://download.osgeo.org/ossim/installers/

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konstantin.baumann
Posts: 87
Registered: ‎01-04-2011
Message 3 of 10 (901 Views)

Re: Can AIM model curvature of the earth?

09-19-2012 07:59 AM in reply to: spatialguru

Yes, AIM supports the earth curvature automatically...

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jmaeding
Posts: 954
Registered: ‎12-27-2006
Message 4 of 10 (896 Views)

Re: Can AIM model curvature of the earth?

09-19-2012 09:07 AM in reply to: konstantin.baumann

what do you mean by support though? Does it always use a "foundation" of a globe?

I would think it depends on the models coordinate system, projected or a non-projected system.

Another interesting issue is atmospheric diffraction, which I heard usually takes away about 1/2 the effect of curved earth.

So you see over the horizon a bit as light follows the earth. Now that would be an impressive model!

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konstantin.baumann
Posts: 87
Registered: ‎01-04-2011
Message 5 of 10 (894 Views)

Re: Can AIM model curvature of the earth?

09-19-2012 09:14 AM in reply to: jmaeding

AIM requires you to correctly geo-reference your model and based on that can support the earth curvature automatically for all projects... just make them large enough and you will see...

 

About the atmospheric diffraction you mentioned: I would not expect that in the very near future... :-)

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jmaeding
Posts: 954
Registered: ‎12-27-2006
Message 6 of 10 (892 Views)

Re: Can AIM model curvature of the earth?

09-19-2012 11:38 AM in reply to: jmaeding

I will try using UTM or something

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spatialguru
Posts: 12
Registered: ‎05-12-2011
Message 7 of 10 (889 Views)

Re: Can AIM model curvature of the earth?

09-19-2012 11:57 AM in reply to: jmaeding

Totally off topic from AIM, but I forgot to mention, depending on capabilities you need or real-time spatial dynamics, you might also be interested in http://cesium.agi.com/ 

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heiko.meyerdirks
Posts: 20
Registered: ‎07-31-2012
Message 8 of 10 (879 Views)

Re: Can AIM model curvature of the earth?

09-20-2012 03:08 AM in reply to: jmaeding

Hello

 

If you choose an UTM zone you will restrict your model extend to the valid extend of that specific UTM zone. To work in a world context, it is best to use a worldwide valid coordinate system (CS). Therefore I would recommend not to change the database CS as LL84 is worldwide valid.

 

You will not gain anything by changing the database CS and you can still change the display of the coordinates any time by modifying the User Coordinate System.

 

Heiko

Heiko Meyerdirks
Engineering Manager
Autodesk IPG ICP InfraWorks
Distinguished Contributor
jmaeding
Posts: 954
Registered: ‎12-27-2006
Message 9 of 10 (875 Views)

Re: Can AIM model curvature of the earth?

09-20-2012 08:31 AM in reply to: jmaeding

ah, thanks for the tip.

I tend to use CA state plane zone 6 prettymuch all the time, so am less educated on the "global" coordinate systems other than figuring out which one is used by a given chunk of data.

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BrianHailey
Posts: 2,749
Registered: ‎04-27-2005
Message 10 of 10 (846 Views)

Re: Can AIM model curvature of the earth?

09-24-2012 06:15 PM in reply to: jmaeding

Here's an example of AIM showing curvature of the earth:

 

http://screencast.com/t/xqXvIZxULN

 

 

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