basemap plot the opposite longitudinal section
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 25/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- python
- Domain
- data-visualization
Research direction
Reproduce the reported code with Basemap 1.0.7 and matplotlib 2.0.0, using the longitude bounds [60,190] and the bluemarble background. Start by checking how the Mercator bounds and lon_0 are handled when crossing the dateline; done means the Indo-Pacific section displays in the requested orientation and domain.
Written by the indexing model from the issue text.
Description
I'm getting nothing from stackoverflow so I post it here.
The problem is I can't let bluemarble to plot a map showing the Indo-Pacific longitudinal section, covering the longitude band of about [60,190]. Below is my code:
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap
lats=[-25,66]
lons=[60,187]
fig=plt.figure();ax=fig.add_subplot(111)
bmap=Basemap(projection='merc',\
llcrnrlat=lats[0],llcrnrlon=lons[0],\
urcrnrlat=lats[1],urcrnrlon=lons[1]-360.,\
lon_0=(lons[0]+lons[1])/2.,\
ax=ax)
bmap.bluemarble()
plt.show()
The result has its x-axis flipped, I guess somehow related to this issue#192
If I swap the llcrnrlon and urcrnrlon:
bmap=Basemap(projection='merc',\
llcrnrlat=lats[0],llcrnrlon=lons[1]-360.,\
urcrnrlat=lats[1],urcrnrlon=lons[0],\
lon_0=(lons[0]+lons[1])/2.,\
ax=ax)
the map shows correct orientation, but the wrong domain. I wanted to show the Indian ocean, Euro-asia and west Pacific, however the map shows the remaining longitudes, covering the central-east Pacific, America continents and Atlantic. The lon_0 argument doesn't seem to do anything.
I am aware that when crossing the dateline things get complicated and sometimes you need to shiftgrid() or shiftdata(), but in this case I have no data yet, just the bluemarble background.
Please help.
Some versions (all in conda with python2.7):
basemap=1.0.7=np111py27_0
matplotlib=2.0.0=np111py27_0
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