Re: flight file to dted conversion

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From: Angus Dorbie (dorbie++at++sgi.com)
Date: 02/03/2000 13:32:58

No, even a flight file from dted will bear very little relation to the
original file. A Delauny style triangulation is performed multiple times
(for various LOD's) and this is further structured spatially for culling
and management purposes.

Cheers,ANgus.

"Brickley, Jeff" wrote:
>
> DTED is a regular grid format defination for terrain
> elevations. Basically 1201 points in a single degree
> latitude and longitude. The format is described at
> http://www.nima.mil/publications/specs/printed/DTED/DTED_1-2
> .html though it is pretty dry reading.... hehe
>
> To convert from flight to DTED would be pretty straight
> forward **IF** the flight file was originally taken from
> DTED, you should be able to take the vertices and convert
> them back to the DTED posts. however, if the grid has been
> reduced via delauny you'd have to re-gridify (do
> programmer's make up these words?) the data before writing
> it back out. I read and write DTED files here, but I am
> afraid I do not have code for reading and writing flight
> format....
>
> Jeffry J. Brickley <jbrickley++at++programmer.net>
> SRS Information Services
> WSMR, NM 88002
> 505-678-3557
>
> > -----Original Message-----
> > From: Larry Matthias [SMTP:l.e.matthias++at++larc.nasa.gov]
> > Sent: Thursday, February 03, 2000 5:21 AM
> > To: info-performer++at++sgi.com
> > Subject: Re: flight file to dted conversion
> >
> >
> > Paul,
> > What is the dted file format? I do have a translator
> > called NuGraf
> > that
> > does quite a few different model formats. It does not list
> > the dted
> > format.
> >
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-- 
For Performer+OpenGL tutorials http://www.dorbie.com/
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After giving up raiding their neighboring countries the Norse men
have taken to raiding 16 year old kids in their bedrooms. Very sad.

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