Hello,
I'm new to this list (but not matplotlib and basemap), and am not sure if
this is the place to post basemap questions. I apologise if I have erred.
I'm reporting an issue whereby if I try to plot a zoomed in orthographic
projection with a bluemarble (or etopo or shaded relief) background, the
background remains "global," though it's oriented to the correct location,
not mapping to the zoomed projection coordinates. I am pasting in a simple
demo code that illustrates the behaviour. If you use the lcc projection,
all works fine, and if you use a "non-zoomed" ortho projection, the
background maps correctly.
It seems that there is something preventing the background from mapping
into anything but a "complete-domain" ortho projection. I'm not a great
map person, and I realise I may be missing the boat on the way I'm trying
to zoom my ortho projection, but I'm not sure.
Am I screwing up, or is it a bug?
Thank you,
Don Morton
#---------------------------------------------------
import mpl_toolkits.basemap as bm
import matplotlib.pyplot as plt
import numpy as np
# Define a lambert conformal over northwest United States
# With this projection (centered on Montana, and zoomed in),
# the background image does map to the zoomed in projection
'''
theMap = bm.Basemap(projection='lcc',
lat_0=47, lat_1=30, lat_2=60, lon_0=-115,
llcrnrlat=43, llcrnrlon=-128,
urcrnrlat=55, urcrnrlon=-105,
resolution='i', area_thresh=1000)
'''
# With this projection (centered on Vienna, and zoomed in),
# the background image doesn't map to the zoomed in projection
theMap = bm.Basemap(projection='ortho',
lat_0=48.2, lon_0=16.4,
llcrnry=-1000000.0, llcrnrx=-1000000.0,
urcrnry=1000000.0, urcrnrx=1000000.0,
resolution='l', area_thresh=1000)
theMap.drawcountries()
theMap.drawcoastlines()
theMap.bluemarble()
#theMap.shadedrelief()
#theMap.etopo()
plt.show()
---
Don Morton, Owner/Manager
Boreal Scientific Computing LLC
Fairbanks, Alaska USA
http://www.borealscicomp.com/
http://www.borealscicomp.com/Miscellaneous/MortonBio/
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