| Plotting a trajectory against a mapped image [message #44705] |
Tue, 12 July 2005 15:24  |
steve
Messages: 19
Registered: March 1991
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Junior Member |
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Greetings everyone,
I am a novice IDL user and I have the task of displaying trajectories
with respect to a mapped projection of the earth. I am using map_image
to generate a projection of the earth with terrain, but I can't seem to
find what I would need to overlay a trajectory on top of that. I've
tried the PLOTS function, but since T3D is not specified it will only
plot lines against the surface and ignore the z component. I know I
could use SURFACE to get the transformation matrix I need for PLOTS to
operate correctly, but I'm not sure how to set it up to work with the
image that I have mapped. Am I on the right track, or is there
something better I could use?
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| Re: Plotting a trajectory against a mapped image [message #44787 is a reply to message #44705] |
Wed, 13 July 2005 09:06  |
Klemens Barfus
Messages: 45
Registered: December 2002
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Member |
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Hi Steve,
I asked the distributor of IDL in Germany for exactly this feature one
week ago. I wanted to plot three dimensional data of an atmospheric
model with a map as a coordinate system for x and y coordinates. The T3D
feature does not work - hopefully they will see thee need to add this
feature.
What I did: I changed the coordinates to rectangular coordinates, but
then you have to change all your terrain coordinates, too and the result
depends on the size of the observed area...
If you some source code, send me an email.
Hope this helps,
Klemens
steve wrote:
> Greetings everyone,
>
> I am a novice IDL user and I have the task of displaying trajectories
> with respect to a mapped projection of the earth. I am using map_image
> to generate a projection of the earth with terrain, but I can't seem to
> find what I would need to overlay a trajectory on top of that. I've
> tried the PLOTS function, but since T3D is not specified it will only
> plot lines against the surface and ignore the z component. I know I
> could use SURFACE to get the transformation matrix I need for PLOTS to
> operate correctly, but I'm not sure how to set it up to work with the
> image that I have mapped. Am I on the right track, or is there
> something better I could use?
>
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