| Jagged edges in POLAR_CONTOUR? [message #79285] |
Wed, 15 February 2012 10:34 |
John Coxon
Messages: 15
Registered: February 2012
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Junior Member |
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Hi all,
I am using POLAR_CONTOUR to plot some data, using three 1-D arrays (the
way my data files are structured makes it easier to do it that way). It
seems to be working fine, but there are jagged edges in places I wasn't
expecting them.
The plot is available here (Dropbox link): http://db.tt/C65qMrGQ
The code I'm using to plot it is:
polar_contour,current,mltrad,colat,xrange = [-30,30],/xstyle,xtitle =
'Colatitude (MLT = 18 (-ve) & 6 (+ve))',yrange = [-30,30],/ystyle,ytitle
= 'Colatitude (MLT = 0 (-ve) & 12 (+ve))',levels = indgen(ncontours) *
0.2 - 1.0,/fill,c_col = indgen(ncontours) + 1,position =
[0.08,0.3,0.48,0.86],title = 'Current density in northern hemisphere'
mltrad is an array containing magnetic local times - 24 values between 0
and 23 that are converted into radians - and as such the plot has 24
'spokes'.
For an example of the jagged edges to which I'm referring, on the far
right (0 on the y-axis) there's a region of 0.2 muA/m^2 that has three
spikes on top (for want of more specific/technical terminology). I don't
understand why they are there, since I don't think the data is a fine
enough resolution to result in that kind of feature.
Can anyone shed any light on this? Any help gratefully appreciated!
--
John Coxon
Join Dropbox and we both get bonus space!
http://db.tt/MWwN5TT
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