epsg:4326

[klonuo]

Jeff, I'm finishing wmsimage() function to Basemap class similar to arcgisimage() function and now testing.

Most WMS servers accept just epsg:4326 reference, but I can't figure how to reference coordinates. I would have expected that entering lat/lot pairs should do it, but I guess not. For example:

from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt

plt.figure(figsize=(6,8))
epsg = 4326; lon1 = -85; lat1 = 24; lon2 = -79; lat2 =32
m=Basemap(epsg=epsg,resolution='i',llcrnrlon=lon1,llcrnrlat=lat1,\
           urcrnrlon=lon2,urcrnrlat=lat2)
m.arcgisimage(service='NatGeo_World_Map',verbose=True,xpixels=600)

returns this: bbox=-1,0,-1,0

or here is verbose url: http://server.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer/export?bbox=-1,0,-1,0&bboxSR=4326&imageSR=4326&size=600,800&dpi=96&format=png32&f=image

Why?
Or how can I use this projection in defined lat/lon pairs?

[klonuo]

epsg = 4326; lon1 = -85; lat1 = 24; lon2 = -79; lat2 =32

Hm, in original test code, from where this snippet is copied, you use epsg:3086, and above lat/lon values define exact bounds for that projection.

It must be that I don't understand how this projection schemes works, but I would expect to be able to define region with lat/lon pairs

[jswhit]

I've fixed some problems with epsg=4326 in arcgisimage, so give it a try now.

What is the purpose of the wmsimage class (what does it do different than arcgisimage)? I'd like to avoid a proliferation of methods with similar names - so if we could the needed functionality with an extra keyword to arcgisimage I think that would be preferable.

[klonuo]

Thanks Jeff, I'll give it a try

What is the purpose of the wmsimage class (what does it do different than arcgisimage)? I'd like to avoid a proliferation of methods with similar names - so if we could the needed functionality with an extra keyword to arcgisimage I think that would be preferable.

It's just a function as arcgisimage()
I was looking also for a way to use same function for both services, but it doesn't look like good idea.
Because of different parameters, and WMS versions check, then capabilities validation upon parameters provided. And then yet because urllib module can't transparently handle chunked transfer encoding, which WMS servers use.
Have a look at this draft

If you have any suggestions do tell