WXS implementation

This drb-impl-wXs module implements the OWS services (WFS, WMS, WCS, ...). For more information about OWS Service see https://www.ogc.org/ or/and https://www.ogc.org/standards/wms OGC catalog, this implementation is abstract, it means that to have a usable OWS service implementation, we have to create an implementation for this service dependent on this abstract implementation. Sot have a signature, its derived implementations will have to define one

Nodes

WXSServiceNode

Abstract, have to be derived. Represents the WXS service (like WMS, WCS, ...). This node has no attribute and has as children request (like GetMap) WXsOperationNode and other children that define the Service as XmlNode

WXSNodeOperation

Represents an operation than can be used on the service.

Installation

pip install drb-impl-wxs

Usages

To implement an OWS Web Service, we have to create a class based on WXSServiceNode and define at least the read_capabilities method.

class WmsServiceNode(WXSServiceNode):
    ...
    def read_capabilities(self, node_capabilities):
        ....
    

After we can use this node like other DRB Node The operation of service are available across the children of the node service, See drb_impl_wms or drb_impl_wcs for more information.

Example with a drb_impl_wms impl

url_wms='https+wms://wms.fr/geoserver/demo/wms?'

# The service use a special
service_wms = WmsServiceNode(url_wms)

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)
# => return an drb image 

# url of request
# https://wms.fr/geoserver/demo/wms?
# &service=WMS&
# request=GetMap&
# layers=mgrs_region&
# format=image%2Fpng&
# crs=EPSG%3A3857&
# bbox=7514065.628545968,7514065.628545967,10018754.171394622,10018754.171394628

Example with a drb_impl_wcs impl

url_wcs='https+wcs://wcs/mapserv'

# The service use a special
service_wcs = WcsServiceNode(url_wcs, auth=None, map='/map/nitrogen.map')


# SUBSET is use twice with two values, we use a list to in dict 
dict_request = {'COVERAGEID': 'nitrogen_5-15cm_Q0.5',
                'VERSION': '2.0.1',
                'SUBSET': ['X(-1784000,-1140000)', 'Y(1356000,1863000)'],
                'FORMAT': 'GEOTIFF_INT16',
                'SUBSETTINGCRS': 'http://www.opengis.net/def/crs/EPSG/0/152160',
                'OUTPUTCRS': 'http://www.opengis.net/def/crs/EPSG/0/152160'
                }

get_map = service_wcs['GetCoverage'][dict_request]
# url of request
# https://wcs/mapserv?
# map=%2Fmap%2Fnitrogen.map&
# SERVICE=WCS&VERSION=2.0.1&
# REQUEST=GetCoverage&
# COVERAGEID=nitrogen_5-15cm_Q0.5&
# FORMAT=GEOTIFF_INT16&
# SUBSET=X(-1784000%2C-1140000)&SUBSET=Y(1356000%2C1863000)&
# SUBSETTINGCRS=http%3A%2F%2Fwww.opengis.net%2Fdef%2Fcrs%2FEPSG%2F0%2F152160&
# OUTPUTCRS=http%3A%2F%2Fwww.opengis.net%2Fdef%2Fcrs%2FEPSG%2F0%2F152160
# => return the image