DRB WMS OGC Service Driver
Project description
WMS Driver
The web map service driver extends abstracts WxS driver with the getMap feature.
Nodes
WmsServiceNode
Represents the WMS service. This node has no attribute and has as children WmsOperationNode like GetMap. Others children give information about the service like layers, and are XmlNode. Those children are filled in by the information returned from the service's GetCapabilities request.
WmsOperationNode
Represents an operation than can mde on the service. For WMS service, the mandatory operation are GetMap, GetCapabilities, and GetFeatureInfo. Optional operations may be provided by the service and indicated in the possibilities thereof. Those optional operations are also represented as WmsOperationNode.
For perform an operation (mandatory or optional), you can use the operator '[]' with a dict that contains the parameters of the request.
Example:
dict_request = {'layers': 'mgrs_region', 'format': 'image/png', 'height': 256, 'width': 256, 'crs': 'EPSG:3857', 'bbox': '7514065.628545968,7514065.628545967,10018754.171394622,10018754.171394628'}
get_map = service_wms['GetMap'][dict_request]
For mandatory operations GetMap and GetFeatureInfo you can alternatively use Predicate WmsGetMapPredicate and WmsGetFeatureInfoPredicate.
Specific class define WXSNodeOperationGetMap and WXSNodeOperationGetFeatureInfo for accept respectively WmsGetMapPredicate WmsGetFeatureInfoPredicate.
Example:
predicate = WmsGetMapPredicate(layers='mgrs_region', height=256, width=256, bbox='7514065.628545968,7514065.628545967,10018754.171394622,10018754.171394628'}
get_map = service_wms['GetMap'][predicate]
Installation
pip install drb-driver-wms
Examples
from drb.drivers.wms import WmsServiceNode
url_wms='https+wms://geoserver.swarm.ops.internal.gael.fr/geoserver/demo/wms?'
service_wms = WmsServiceNode(url_wms)
list_cap = service_wms.children
print('----------------------------------------')
print('list_cap')
print(list_cap)
for child in service_wms.children:
print(child)
print(child.name)
#=> <drb.drivers.wXs.wXs_node.WXSNodeOperation object at 0x7fc2cb0aeaf0>
#=> GetCapabilities
#=> <drb.drivers.wXs.wXs_node.WXSNodeOperation object at 0x7fc2cb0ae520>
#=> GetMap
#=> <drb.drivers.wXs.wXs_node.WXSNodeOperation object at 0x7fc2cb0a2460>
#=> GetFeatureInfo
#=> <drb.drivers.xml.xml_node.XmlNode object at 0x7fc2cb0aefd0>
#=> Exception
#=> <drb.drivers.xml.xml_node.XmlNode object at 0x7fc2cb0aed30>
#=> Layer
get_map = service_wms['GetMap']
print('----------------------------------------')
print('GetMap : Format')
print(get_map.get_attribute('Format'))
#=> ['image/png', 'application/atom+xml', 'application/json;type=geojson', 'application/json;type=topojson', 'application/json;type=utfgrid', 'application/pdf', 'application/rss+xml', 'application/vnd.google-earth.kml+xml', 'application/vnd.google-earth.kml+xml;mode=networklink', 'application/vnd.google-earth.kmz', 'application/vnd.mapbox-vector-tile', 'image/geotiff', 'image/geotiff8', 'image/gif', 'image/jpeg', 'image/png; mode=8bit', 'image/svg+xml', 'image/tiff', 'image/tiff8', 'image/vnd.jpeg-png', 'image/vnd.jpeg-png8', 'text/html; subtype=openlayers', 'text/html; subtype=openlayers2', 'text/html; subtype=openlayers3']
dict_request = {'layers': 'mgrs_region', 'format': 'image/png', 'height': 256, 'width': 256, 'crs': 'EPSG:3857', 'bbox': '7514065.628545968,7514065.628545967,10018754.171394622,10018754.171394628'}
get_map = service_wms['GetMap'][dict_request]
print('----------------------------------------')
print('GetMap : with parameter return image')
print(get_map)
#=> <drb.drivers.image.image_node_factory.DrbImageBaseNode object at 0x7fc2cb23efa0>
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