Thread: [Matplotlib-users] Negative aspect ratios in basemap

Hi matplotlib-users,
I have an application in which regions that are not known beforehand are defined and plotted. When the application plots a region a Basemap instance is created. My datasets define longitudes from 0 to 360. When regions cross the Greenwich meridian I try to make a Basemap like this:
m = Basemap(350, -10, 10, 10)
print m.aspect
But this results in negative aspect ratios. How would you handle that? Will I have to make extra checks for whether the region crosses the 0 meridian and add 360 to all longitudes > 0 or do you have a better solution?
(i.e. create m = Basemap(350, -10, 370, 10))
Regards,
Jesper

Larsen, Jesper wrote:
>
> Hi matplotlib-users,
>
> I have an application in which regions that are not known beforehand 
> are defined and plotted. When the application plots a region a Basemap 
> instance is created. My datasets define longitudes from 0 to 360. When 
> regions cross the Greenwich meridian I try to make a Basemap like this:
>
> m = Basemap(350, -10, 10, 10)
> print m.aspect
>
> But this results in negative aspect ratios. How would you handle that? 
> Will I have to make extra checks for whether the region crosses the 0 
> meridian and add 360 to all longitudes > 0 or do you have a better 
> solution?
>
> (i.e. create m = Basemap(350, -10, 370, 10))
>
Jesper: Yes, that should work fine.
-Jeff
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