| Polar TV [message #62848] |
Thu, 09 October 2008 11:40 |
Brian Larsen
Messages: 270
Registered: June 2006
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Senior Member |
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All,
I'll do my best to explain what I am trying to do.
I have computed occurrence probability at various radius and local
time sectors around the earth and am displaying them using tv on axes
of X:Radius, Y:local time, Color:value (the smoothing that contour
does is not what I want here so I use TV). What I would really rather
do is display this in a polar plot where you can see radius as just
radial distance from the earth and local time is seen as angle around
the circles, and color stays the same.
A smooth (my data is not smooth) example of the right kind of thing
is:
http://www-ssc.igpp.ucla.edu/gem/poster/weimer/ggcm/figure3. gif
except for me the earth is in the center and all values are in space
out from the earth.
In bullets the things I am trying to do:
- make the data that you would feed into contour (2-d array of values,
1-d x, 1-d y) polar but without the smoothing inherent in a contour
plot
- the bins should be the right shape, meaning that they are little pie
pieces with the tip missing
I have tried using polyfill for this by using cv_coord to change the
x,y to r,theta and then plotting each with a color but I dont have it
quite right and dont want to spend a bunch more time if someone has
already done it better. Is there some other way I should be thinking
about? Is there map projection function that can be tricked into
doing what I want? Or has someone implemented the polyfill technique
that is willing to share?
Thanks much and please ask for clarification if it is needed,
Brian
------------------------------------------------------------ --------------
Brian Larsen
Boston University
Center for Space Physics
http://people.bu.edu/balarsen/Home/IDL
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