Is there an equivalent for contourc in the mapping toolbox?

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Alexander
Alexander 2015-7-24
回答： Chad Greene 2015-8-1
I have two georeferenced 2D fields (lat,lon,F1,F2). I want to plot them into the same axis, one of them with
axesm('MapProjection','stereo', ...)
pcolorm(lat,lon,F1)
and from the other one only a single contourline with
contourm(lat,lon,F2,[2 2]).
Of course this doesn't work since both fields have different physical meanings/units.
In a X/Y coordinate system I could use the low level function contourc (without plot)
C = contourc(x,y,F2)
with gives me the x/y coordinates of the contour lines. So I would be able to plot the contourlines into the same axis with the line function.
However, there is no function contourcm .
I could plot F2 in a second figure using
C = contourm(lat,lon,pv',[2 2];
to get the coordinates (lat/lon) of the contourline and then plot this line using linem.
Is it somehow possible to plot both fields into one axis in the way described above, and avoid a second (contourline) plot?
Thanks

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Chad Greene
Chad Greene 2015-8-1
I have a similar response to the one I gave to a different question you recently asked. If you convert your georeferenced coordinates to map coordinates you can usually use regular plotting (not mapping) functions. After you've initialized a map with
axesm('MapProjection','stereo', ...)
You should be able to convert any lat,lon data to map coordinates, which are usually an x,y grid in the range of -0.5 to 0.5 or something thereabouts. With a map initialized,
[x,y] = mfwdtran(lat,lon);
converts your lat,lon data to projected x,y data based on the current map's projection formula. With x and y data, you can then plot it with any standard plotting functions like plot, contourc, etc.
C = contourc(x,y,F2);

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