| difference between icontour and contour? [message #50706] |
Thu, 12 October 2006 06:49 |
EArnold
Messages: 1
Registered: October 2006
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Junior Member |
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hello,
I have a problem with strange artifacts when i use icontour and a map
projection. The problem occurs only when i use icontour, not when i use
contour.
I would like to make a contour plot with the north pole as center of
the map. The data and coordinates are stored in three fields,
f_data(i,j), f_longitude(i,j), f_latitude(i,j).
First I set the projection via
map_set, /stereographic, 90, 0, /isotropic, limit = [0, -180, 90, 180],
/grid, /continents, latdel=20, londel=20
followed by the contour-plot
contour, f_data, f_longitude, f_latitude, /fill, /over
The result is correct, as expected. The field is displayed, including
the pole.
Then I try the same using icontour instead of contour. I choose the
'polar stereographic'-projection and import the fields f_data,
f_longitude, f_latitude.
Via Insert->Visualization and setting Grid units to 'Degree' and Fill
contours to 'True' my f_data is layed over the pole, but there are
strange artefacts around the pole.
I tried to isolate the problem and used different f_data. Some f_data
that are displayed proper and some are not - but in contour they are
all displayed correctly.
So i think that contour and icontour handle the input fields in a
different way.
What can I do to get rid of the artefacts?
Thanks
PS: i use IDL 6.3 for Windows
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