On Tuesday 09 November 2004 15:38, Curtis L. Olson wrote:
> Gerhard Wesp wrote:
> >Hmm... About what resolution are we talking here?
>
> Generally, 90m SRTM.
>
> >What additional data do you have available for the runways?
> > I guess you have it's position (two endpoints? center
> > point, dire
> This [wc]ould cause problems in places where runways intersect and
> doesn't account for the surface of all the taxiways and the rest of the
Ack. I missed that point.
> For what it's worth, I believe I have beaten the nurbs approach into
> submission (mostly) and I hope that the next scener
Gerhard Wesp wrote:
Hmm... About what resolution are we talking here?
Generally, 90m SRTM.
What additional data do you have available for the runways? I guess you
have it's position (two endpoints? center point, direction, length?)
and ``elevation''? Commonly, the runway elevation at both th
Gerhard Wesp wrote:
> What additional data do you have available for the runways? I guess you
> have it's position (two endpoints? center point, direction, length?)
Runway center point, orientation, length, width and in rare cases an
exact elevation - not to think about that the whole stuff has
> Unfortunately DEM data is *way* too noisy and has too much potential for
> odd artifacts to use directly. What I have done is to take a coarse
Hmm... About what resolution are we talking here?
What additional data do you have available for the runways? I guess you
have it's position (two e
On Monday 08 November 2004 13:28, Christian Mayer wrote:
> Curtis L. Olson schrieb:
> > Christian Mayer wrote:
> >> Well, googling for "bezier 2d" gave me:
> >>
> >> http://www.cs.wpi.edu/~matt/courses/cs563/talks/surface/bez_surf.html
> >> (not exactly what you are looking for, but it looked like
Curtis L. Olson schrieb:
Christian Mayer wrote:
What you might try is putting a bezier patch through the points. The
Bezier curve guarantees you that it won't leave the convex hull of
your points. But it won't go through your controll points (what you
actually want to achive to smooth your data.
Curtis L. Olson writes:
>
> It would be great if I didn't have to write and debug my own bezier
> library, are you aware of any existing code that could help me out here?
This is another 'classic' that has source available
http://eros.cagd.eas.asu.edu/~farin/cagdbook/cagdbook.html
Norman
Curtis L. Olson writes:
>
> It would be great if I didn't have to write and debug my own bezier
> library, are you aware of any existing code that could help me out here?
Here is a classic source
http://www.nar-associates.com/nurbs/c_code.html
Note that you will want to repeat the edge vertice
Christian Mayer wrote:
NURBS aren't good conditioned. That means that depending on the input
data it can easily happen that your result will be rubbish.
I'm not married to nurbs, but I'm looking for a way to fit a smooth
curved surface through a set of points. The nurbs++ library is what I
fou
Curtis L. Olson schrieb:
I find that when I try to interpolate a nurbs surface through the grid
points, the resulting surface misses many/most of the points, which is
not what I expected. I also tried a least squares fit which actually I
*really* like, however, I'm finding that the least square
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