Thanks again for your tips. Using WMSlayer.layers property is a potential workaround, but apparently there are layer indexes in webmap that also need to be set (?). WMSlayer however does not have any methods associated with it.
I have now done a fair amount of testing for handling WMS layers with the arcgis API for Python for arcgis Online. My conclusions so far are:
- WMS layers can be created as content
- a practical way to add WMS layers to a webmap was not found
- the documentation, API methods and exception handling for WMS layers are rudimentary.
ESRI developers present in this forum (hopefully) are welcome to respond.
A code snippet of my efforts follows.
# test retrieving WMS layers and putting these onto a webmap on arcgis online portal
from arcgis.gis import GIS
from arcgis.mapping import WebMap
from arcgis.mapping.ogc import WMSLayer
import json
gis = GIS("https://poyry.maps.arcgis.com/", USERNAME, PASSWD)
# retrieve WMS layers
spatialReferences = [2056, 2400, 3006, 3007, 3008, 3009, 3010, 3011, 3012, 3013, 3014, 3015, 3016, 3017, 3018,
3021, 3031, 3032, 3033, 3035, 3785, 3857, 4326, 30061, 30062, 900913, 3152, 30063, 30064]
# above list works -> need to research exactly what is needed
layers= [
{
"name": "ch.swisstopo.geologie-eiszeit-lgm",
"title": "Letzteiszeitl. Max. (Vektor) 500",
"queryable": True
},
{
"name": "ch.swisstopo-karto.skitouren",
"title": "Skirouten",
"queryable": True
}
]
text_layers = {
"title": "SwissTopo",
"url": "http://wms.geo.admin.ch/",
"version": "1.3.0",
"layers": layers,
"spatialReferences": spatialReferences ,
"format": None,
"featureInfoFormat": "text/html"
}
item={
'title':'SwissTopo_WMS_testing',
'description':'SwissTopo_testing2',
'tags':'wms',
'type':'WMS',
'url':'http://wms.geo.admin.ch/',
'extent': {'xmin': 5.83581, 'ymin': 45.65916, 'xmax': 10.97931, 'ymax': 47.86991}, # not working
'text': json.dumps(text_layers)
}
swisstopo_testing_wms = gis.content.add(item_properties=item)
print("swisstopo_testing_wms: ", swisstopo_testing_wms)
display(swisstopo_testing_wms) # results in 2 WMS layers grouped under a single webmap layer, OK
# put WMS layers onto webmap
# attempt #1 using .add_layer() -> NG since swisstopo_testing_wms.url is general to all SwissTopo layers
layer = WMSLayer(swisstopo_testing_wms.url)
wm = WebMap()
wm.add_layer(layer)
wm_item_properties = {'title':'WMS_test',
'snippet':'Map created using Python API',
'tags':['python'],
}
wm.save(wm_item_properties) # puts all 705 SwissTopo layers (!) onto a webamp on portal
# attempt #2 using .publish() -> NG as content.publish() method does not wor for WMS
#swisstopo_htesting_feaure_layer_item = swisstopo_testing_wms.publish(
# publish_parameters={'file_type':"WMS"})
# ValueError: A file_type must be provide, data format not recognized
# attempt #3 using WMSlayer.layers property -> NG as wrong layer is displayed in Map Viewer
wm.layers[0].layers = wm.layers[0].layers[501] # replace 705 SwissTopo layers with a single layer
#wm.update()
# RuntimeError: Item object missing, you should use `save()` method if you are creating a new web map item ??
wm.save(wm_item_properties) # results in a single webmap layer entry, which is correctly shown in Overview,
# however the Map Viewer displays the wrong layer !
