Re: [Matplotlib-users] How to properly define lat/lon WGS84 in basemap module?

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

Roger André wrote:
> Hi All,
>
> I have some square images which were generated via WMS requests.  I 
> have imported them into Matplotlib via pil_to_array, and then display 
> them in a Basemap instance where I have defined the projection as:
>
> m = Basemap(projection='cyl', lon_0=lon_0, llcrnrlon=ll_lon, 
> llcrnrlat=ll_lat, urcrnrlon=ur_lon,
>             urcrnrlat=ur_lat, suppress_ticks=False)
>
> While this works (it appears the tics are at the right places), the 
> image is no longer square, and I wonder if my projection definition is 
> correct.
>
> Can someone show me what the correct Basemap parameters are for 
> working with images that are in EPSG:4326?
>
> Thanks,
>
> Roger

Roger:  The image will only be square if ur_lon-ll_lon = ur_lat-ll_lat 
(i.e. the longitude range equals the latitude range).  Is this the case? 

-Jeff

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Jeffrey S. Whitaker         Phone : (303)497-6313
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