Re: [Matplotlib-users] Background basemaps in Basemap

[Jeff W. <jef...@no...>]

On 8/27/12 11:24 AM, klo uo wrote:
> On Mon, Aug 27, 2012 at 2:34 PM, Jeff Whitaker wrote:
>> Klo:  WMS servers use EPSG codes to define map projections - Basemap uses a
>> set of kwargs.  We need some way of inferring epsg codes from the Basemap
>> kwargs.  Alternatively, we could extend Basemap so it can accept EPSG codes.
>> But, there are many EPSG codes that don't correspond to allowable Basemap
>> projections, and valid Basemap projections that don't correspond to EPSG
>> codes.  It's not obvious to me how to proceed.
>>> Here is same server from agency where you work according your
>>> signature: maps.ngdc.noaa.gov/rest/services it provides additional
>>> maps on same server as arcgis
>>>
>>> I also checked many WMS servers, first with XML editor but then with
>>> Gaia, which was excellent help in determining that many WMS servers
>>> just return their capabilities, but does not provide service as
>>> described in capabilities response. Some offer tilling features, for
>>> possible future interactive zooming in Basemap ;)
>>
>> Maybe it's better not have the function accept a OWSLib wms object - that
>> way we don't have to tie ourselves to a particular WMS server.
>
> Thanks for explaining Jeff, but aren't we using arcgis REST service
> which accepts more then 4500 projections? Are you saying Basemap
> offers projection that's not listed here:
> http://atlas.resources.ca.gov/arcgis/SDK/REST/gcs.html

Klo:  Yes.  And vice versa, some of those 4500 projections aren't 
supported by Basemap.

Anyway, I went ahead and created a prototype 'wmsmap' method. You can 
try it by cloning my fork (https://github.com/jswhit/basemap) and 
running examples/testwms.py.  I created an extra kward 'epsg' for 
creating Basemap instances. To use the wmsmap function, you have to use 
that keyword.  Give it a try and let me know what you think.

-Jeff
>
> EPSG codes may be important to WMS. And providing WMS feature is maybe
> question how. Any GIS tool has WMS service support. Some WMS servers
> provide tiling capabilities and that also can be considered for future
> feature of fast zooming in Basemap. Most of them seem to offer just
> EPSG:4326 and there are servers with many projections (not as many as
> arcgis REST service)
> But at this point of static map servers we can just use urllib module
> and do requested WMS function which will return the map without using
> any additional function or package
>
> I'm validating public WMS servers and these days I'll report again. As
> mentioned many simply aren't working, many are localized, etc.
> Hope will find nice usage for some selected
>
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