 # Plotting in West Longitude

Hello All,

I am trying to map the surface of TItan for a summer internship project at NASA. I would like to use matplotlib to plot, but I need to plot in West Longitude, where the left edge of the graph starts at 360 and the right edge ends at 0. Does anyone know how to do this?

Thanks much,
Jeff

Hello All,

I am trying to map the surface of TItan for a summer internship project at NASA. I would like to use matplotlib to plot, but I need to plot in West Longitude, where the left edge of the graph starts at 360 and the right edge ends at 0. Does anyone know how to do this?

Thanks much,
Jeff

Jeff: Using the basemap toolkit,

from matplotlib.toolkits.basemap import Basemap
# setup cylindrical equidistant map projection (global domain).
# resolution=None means don't bother with earth coastlines and political boundaries.
m = Basemap(llcrnrlon=0.,llcrnrlat=-90,urcrnrlon=360.,urcrnrlat=90.,resolution=None,projection='cyl')
# use plot, contour, imshow, pcolor .. methods to plot the data here
# draw parallels
delat = 30.
circles = arange(0.,90.+delat,delat).tolist()+\
arange(-delat,-90.-delat,-delat).tolist()
m.drawparallels(circles,labels=[1,0,0,1])
# draw meridians
delon = 60.
meridians = arange(-180,180,delon)
m.drawmeridians(meridians,labels=[1,0,0,1])
title('Cylindrical Equidistant')
show()

There are lots of examples in the source distribution, and a short tutorial is here

http://www.scipy.org/Cookbook/Matplotlib/Maps

HTH,

-Jeff

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HI,

There are series like that...

I need to plot in West
Longitude, where the left edge of the graph starts at 360 and the right
edge ends at 0. Does anyone know how to do this?

Assuming you have a plot (not an image):
xlim(360,0)
or gca.set_xlim(360,0)

HIH,
P.