3d length calculation

I have some road data in Gauß-Krüger zone 5 projection with the associated mean-sea-level heights.
I've defined a compound coordinate system taht consists of a vertical and projected coordinate system. Taking the transverse-mercator projection into account is it mathematically correct to calculate 3d length of those lines using the heights stored with the projected geometries? Or would it be more accurate to convert the data back to the geographic coordinate reference system (WGS84 for instance) with ellipsoidal heights to do this calculation? Will Spatial do 3d length calculation with geographic coordinate system?

Hi,-
Sure, it is sound to do 3D length calculation. I was not meaning the opposite.
The question is how to define the 3D length in your geographic coordinate system.
You just gave one example: 2d projected coordinates and mean-sea-level heights (basically height above the geoid).
However, this may not serve general purpose as you also mentioned.
That is why i mentioned once you define your 3D length, then we can start talking about accuracy.
If you do calculations on small segments, you can stick to projected space as i mentioned previously.
Can we ask what your application is about? Maybe we can suggest more depending on your application
which tries to compute the 3D length.
Thanks

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return
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catch(ClassNotFoundException cnfE)
return
provideErrMsg(messageName,processStatus,selfID,processNumber,signalCode);
catch(IllegalAccessException iaE)
return
provideErrMsg(messageName,processStatus,selfID,processNumber,signalCode);
catch (InstantiationException iE)
return
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indexFile.close();
traceFile.close();
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} // end of TraceFileListModel
Most important part is:
messageClass=Class.forName(this.GEN_PREFIX+messageName);
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then I return ipcmessage. And I think when I scroll down/up
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There is a 9i beta version currently available that already will permit proper computations for your large geodetic geometries.

[SOLVED] Audacious displays incorrect song times

For seemingly random songs, Audacious displays the correct time when I load them on the playlist - but when I click on it and it starts playing (let's say a 4 minute song) the song time will suddenly change to something like 26 minutes... o_O For other songs, this doesn't happen at all. Very odd.
Last edited by yarjar (2007-07-10 15:58:23)

Try to toggle "Enable fast play-length calculation" in MPEG audio plugin properties.

GUI Tool for Image Analysis (delimited ascii file)

i've created a Java GUI Tool for Image Analysis. It does length calculation and locate the coordinate of centroid of an image...the problem now is how do i save the results in a delimited ascii file??

Create a FileOutputStream, use that to construct a PrintWriter, then use the PrintWriter as you use System.out. Print out the data, then append the delimiter manually after each set of data.
To get the file, the simplest ways would be to hard code an output file name or at least have a text field so the user can enter it. If you want it to look more professional, use a JFileChooser.
I hope this helps!
-JBoeing

3d length calculation

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