Re: [Matplotlib-users] A question on Basemap projection

[Jeff W. <js...@fa...>]

Mauro Cavalcanti wrote:
> Dear Jeff,
>
> 2008/12/7 Jeff Whitaker <js...@fa...>:
>   
>> Mauro:  Just set the llrncrlat,urcrnrlon appropriately.  For instance,
>> llcrnrlon=0, urcrnrlon=360 will produce a map centered on the dateline while
>> llcrnrlon=-180, urcrnrlon=180 will produce a map centered on Greenwich.
>>     
>
> Thanks! I had not figured out that the decimal coordinates used by
> Basemap range from 0 to 360 (and not just from -180 to 180). 

Mauro:  I just updated SVN basemap so you can specify just lon_0  for 
all cylindrical projections (cyl,gall,merc,mill) to get a global map 
centered on lon_0 (implying 
llcrnrlat=-90,urcrnrlat=90,llcrnrlon=lon_0-180,urcrnrlon=lon_0+180).
> Using
> this tip, I could also create a map centered on the Indian Ocean. BTW,
> by varying the llcrnrlat and urcrnrlat, can one also create maps
> centered on the North and South poles using a Equirectangular
> projection?
>   
No.  Cylindrical projections can't cross the poles.

-Jeff
> With best regards,
>
>   


-- 
Jeffrey S. Whitaker         Phone : (303)497-6313
NOAA/OAR/CDC  R/PSD1        FAX   : (303)497-6449
325 Broadway                Boulder, CO, USA 80305-3328