Working on getting retrieving Kartverket map data

kartverket_wms.py

'''
A Package for retrieving Kartverket image data for specified areas.

Exampl URLs
-----------
GetCapabilities:
http://opencache.statkart.no/gatekeeper/gk/gk.open?Version=1.0.0&service=wms&request=getcapabilities

NOAA (not active/testable):
http://porter.pmel.noaa.gov:8922/wms/wms_servlet?VERSION=1.1.1&REQUEST=GetMap&LAYERS=coads_climatology_cdf:airt&STYLES=ferret_default&WIDTH=640&HEIGHT=320&FORMAT=image/png&SRS=EPSG:4326&BBOX=-180.0,-90.0,180.0,90.0&EXCEPTION=application/vnd.ogc.se_xml&DIM_COADS_CLIMATOLOGY_CDF_TIME=15-Jan
'''

def getmap_url(layers, styles='', width=640, height=320, fmt='image/png',
        srs='EPSG:4326', bbox='-180.0,-90.0,180.0,90.0', exception=None,
        time=None):
    '''Retrieve image data for specified layer and attributes
    '''
    from collections import OrderedDict

    layers = ','.join(['GeoWebCache WMS:{}'.format(l) for l in layers])
    #layers = ','.join([l for l in layers])

    if styles:
        styles = ','.join([s for s in styles])

    wms = OrderedDict()
    wms['url']     = 'http://opencache.statkart.no/gatekeeper/gk/gk.open?'
    wms['version'] = 'VERSION=1.0.0'
    wms['service'] = '&SERVICE=WMS'
    wms['getmap']  = '&REQUEST=GetMap'
    wms['layers']  = '&LAYERS={}'.format(layers)
    wms['styles']  = '&STYLES={}'.format(styles)
    wms['width']   = '&WIDTH={}'.format(width)
    wms['height']  = '&HEIGHT={}'.format(height)
    wms['fmt']     = '&FORMAT={}'.format(fmt)#.replace('/','%2F'))
    wms['srs']     = '&SRS={}'.format(srs)#.replace(':', '%3A'))
    wms['bbox']    = '&BBOX={}'.format(bbox)
    #wms['exception'] = '&EXCEPTION=application/vnd.ogc.se_xml'

    return ''.join(list(wms.values()))