Hi Everyone,
First email here…
I am plotting
meteorological data using matplotlib and basemap - and can do this just
fine. However, I would like to backout the coordinates being used for
the contours that are plotted.
For example, if I were to contour windspeed every 5 m/s and plot
this (which I can do just fine), I would like to save a copy of the
lat, lon pairs as a text file. However, I cannot for the life of me
figure out how to do this. I have a feeling it is pretty simple and
I’m just over looking something that can do this. Any help would be
appreciated.
Thanks,
-Patrick Marsh
Graduate Student
School of Meteorology
University of Oklahoma
Patrick Marsh wrote:
Hi Everyone,
First email here...
I am plotting meteorological data using matplotlib and basemap - and can do this just fine. However, I would like to backout the coordinates being used for the contours that are plotted.
For example, if I were to contour windspeed every 5 m/s and plot this (which I can do just fine), I would like to save a copy of the lat, lon pairs as a text file. However, I cannot for the life of me figure out how to do this. I have a feeling it is pretty simple and I'm just over looking something that can do this. Any help would be appreciated.
Thanks,
-Patrick Marsh
Graduate Student
School of Meteorology
University of Oklahoma
Patrick: contour and contourf return a ContourSet object. ContourSet.collections is a matplotlib LineCollection (for contour) or a PolyCollection (for contourf). You can retrieve the x,y (map projection) coordinates from these, and transfer them back to lat/lon coordinates using the Basemap instance via
lons,lats = map(x,y,inverse=True) # map is a Basemap instance.
See http://matplotlib.sourceforge.net/doc/html/api/collections_api.html for more info on matplotlib collection objects.
HTH,
-Jeff
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