Hi,
Using the example code shown below I can’t get meridians plotted on the screen:
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np
m = Basemap(projection=‘merc’,lon_0=-79, lat_0=25.5,
llcrnrlon=-93, urcrnrlon=-63, llcrnrlat=14, urcrnrlat=36.2)
m.drawcoastlines(linewidth=0.3)
parallels = np.arange(0.,90,2.)
m.drawparallels(parallels, labels=[1,0,0,0])
meridians = np.arange(180.,360.,5.)
m.drawmeridians(meridians, labels=[0,0,0,1])
plt.show()
Two other projections “laea” and “tmerc” work fine for this case.
Any ideas?
Thanks.
···
–
Gökhan
Hi,
Using the example code shown below I can't get meridians plotted on the
screen:
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np
m = Basemap(projection='merc',lon_0=-79, lat_0=25.5,
llcrnrlon=-93, urcrnrlon=-63, llcrnrlat=14, urcrnrlat=36.2)
m.drawcoastlines(linewidth=0.3)
parallels = np.arange(0.,90,2.)
m.drawparallels(parallels, labels=[1,0,0,0])
meridians = np.arange(180.,360.,5.)
It can't handle the wrap; subtract 360 from your meridians, and they will show up.
Eric
···
On 11/16/2011 03:16 PM, Gökhan Sever wrote:
m.drawmeridians(meridians, labels=[0,0,0,1])
plt.show()
Two other projections "laea" and "tmerc" work fine for this case.
Any ideas?
Thanks.
--
Gökhan
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G�khan: The longitudes in your projection definition are negative (-93 to -63), so you need to change
meridians = np.arange(180.,360.,5.)
to
meridians = np.arange(-180.,0.,5.)
It works for the other projections, since the values get transformed to projection coordinates anyway. With merc and cyl, there is no transformation for longitudes.
-Jeff
···
On 11/16/11 6:16 PM, G�khan Sever wrote:
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np
m = Basemap(projection='merc',lon_0=-79, lat_0=25.5,
llcrnrlon=-93, urcrnrlon=-63, llcrnrlat=14, urcrnrlat=36.2)
m.drawcoastlines(linewidth=0.3)
parallels = np.arange(0.,90,2.)
m.drawparallels(parallels, labels=[1,0,0,0])
meridians = np.arange(180.,360.,5.)
m.drawmeridians(meridians, labels=[0,0,0,1])
plt.show()
Two other projections "laea" and "tmerc" work fine for this case.
Any ideas?
Thanks.
--
G�khan
Thanks Jeff and Eric.
Both solutions simply works 
···
–
Gökhan
Hi,
Using the example code shown below I can't get meridians plotted on the
screen:
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np
m = Basemap(projection='merc',lon_0=-79, lat_0=25.5,
llcrnrlon=-93, urcrnrlon=-63, llcrnrlat=14, urcrnrlat=36.2)
m.drawcoastlines(linewidth=0.3)
parallels = np.arange(0.,90,2.)
m.drawparallels(parallels, labels=[1,0,0,0])
meridians = np.arange(180.,360.,5.)
It can't handle the wrap; subtract 360 from your meridians, and they
will show up.
I just committed a fix for this, so that the wraparound is handled automatically in drawmeridians.
-Jeff
···
On 11/16/11 8:00 PM, Eric Firing wrote:
On 11/16/2011 03:16 PM, Gökhan Sever wrote:
Eric
m.drawmeridians(meridians, labels=[0,0,0,1])
plt.show()
Two other projections "laea" and "tmerc" work fine for this case.
Any ideas?
Thanks.
--
Gökhan
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email : Jeffrey.S.Whitaker@...259...
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Boulder, CO, USA 80303-3328 Web : Jeffrey S. Whitaker: NOAA Physical Sciences Laboratory