[OWSLib-users] How do you create a Web Map Context (WMC)

[Passmore, James H.]

I'm trying to create a Web Map Context but I'm completely stuck.

I posted a question on GIS.SE as below that gives a summary of my troubles (or perhaps misunderstandings)

https://gis.stackexchange.com/questions/232538/how-do-you-create-a-wmc-with-owslib


wmc.py tells us that:

class MapContext:
""" Map Context abstraction
It uses a Map representation as input and export it as as map
context
"""

But I have no idea what a 'Map representation' is.  I thought it might be, or be based on, a WMS GetMap request, but if I call wmc.mapToWebMapContext passing either an actual GetMap URL or if I use OWSLIB to generate the GetMap object I get a similar error along the lines " AttributeError: '...' object has no attribute 'id'

Like:

import owslib.wmc as wmc
context_for_basemap_map2 = wmc.mapToWebMapContext("http://ogc2.bgs.ac.uk/geoserver/OneG/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&BBOX=-3475652.856302516069,-3703399.183262269478,5088484.602957472205,3983478.759379811119&SRS=EPSG:3413&WIDTH=986&HEIGHT=886&LAYERS=ARCTIC_NASA_BLUEMARBLE&STYLES=&FORMAT=image/jpeg&FORMAT_OPTIONS=dpi:96&ID=some_unique_id1&")

AttributeError: 'str' object has no attribute 'id'

And:

import owslib.wms as wms
import owslib.wmc as wmc
w = wms.WebMapService("http://ogc2.bgs.ac.uk/geoserver/OneG/ows?", version='1.1.1')
img = w.getmap(layers=["ARCTIC_NASA_BLUEMARBLE"], srs='EPSG:3413', bbox=(-3475652, -3703399, 5088484, 3983478), size=(986, 886), format='image/jpeg', transparent=False, method="Get", exceptions="application/vnd.ogc.se_xml", format_options="dpi:96", queryable="0", id="some_unique_id1")
context_for_basemap_map = wmc.mapToWebMapContext(img)

AttributeError: 'ResponseWrapper' object has no attribute 'id'

Then I thought what if I give the object an 'id'  ~ well that's the reason for adding an ID to the GetMap request/object, which didn't work...

So using the second variant above I tried :

basemap_map.id = uuid.uuid4()
which got rid of the object has no attribute 'id'  error and takes me to the next error object has no attribute 'size'

so I've now got something like:

img.id = uuid.uuid4()
img.size = (1205,735)
img.srs = basemap_params['SRS']
img.bounds = (-3571059.167819473, -4645193.605181879, 4940480.654283983, 546492.5103750005)
img.layernames = basemap_params['LAYERS']
img.layertitles = basemap_context['Title']

which all works (well no error) but I'm now stuck with an error:

'ResponseWrapper' object has no attribute 'getLayerInfos' and I can't work out what it wants.

Does anybody know what I'm doing wrong, I'm assuming I've missed something obvious.

James

James Passmore
GIS and WWW Specialist
-------------------------------
British Geological Survey,
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KEYWORTH,
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Linked Data (vCard):http://data.bgs.ac.uk/ref/BritishGeologicalSurvey
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