WXS driver

This drb-driver-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 driver is abstract, it means that to have a usable OWS service driver, we have to create a driver for this service dependent on this abstract driver. Sot have a signature, its derived drivers 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) WXSNodeOperation and other children that define the Service as XmlNode

WXSNodeOperation

Represents an operation than can be used on the service.

Installation

pip install drb-driver-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.drivers.wms or drb.drivers.wcs for more information.

Example with a drb.drivers.wms driver

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.drivers.wcs driver

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