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How To: Create a web map from a JSON file using ArcGIS API for Python
Summary
In some cases, it is favorable to create a web map using a script, as it can be programmed for multiple web maps. Using the definition specified in a JSON file, the gis.content.add function in ArcGIS API for Python can be used to create the web map.
Procedure
Web maps can be created from a JSON file representation using the gis.content.add function in the GIS module. There are two ways to do :
- Reading the JSON file within the script.
- Defining the JSON description in the script.
Note: Defining the JSON description is a longer process. However, it gives the user the ability to modify the JSON representation of the script.
The steps below describe how to create a web map from a JSON file by reading it using the json module.
-
Import the necessary modules.
from arcgis.gis import GIS from arcgis.mapping import WebMap import json
- Specify the login credentials.
gis = GIS("https://machine.domain.com/portal","adminuser","adminpassword")
print ("Successfully Logged Into GIS: ", gis)
- Open the JSON file.
with open('/home/jupyter/test2.json') as json_data:
data = json.load(json_data)
- Create the new map.
item_properties_dict = {"type": "Web Map","title": "Test Map","tags": ["test","test1","test2"],"snippet":"This is a snippet", "text":data}
newmap = gis.content.add(item_properties = item_properties_dict)
newmap
The following shows the full script:
from arcgis.gis import GIS
from arcgis.mapping import WebMap
import json
gis = GIS("https://machine.domain.com/portal","adminuser","adminpassword")
print ("Successfully Logged Into GIS: ", gis)
with open('/home/jupyter/test2.json') as json_data:
data = json.load(json_data)
item_properties_dict = {"type": "Web Map","title": "Test Map","tags": ["test","test1","test2"],"snippet":"This is a snippet", "text":data}
newmap = gis.content.add(item_properties = item_properties_dict)
newmap
The steps below describe how to create a web map by defining the JSON description in the script.
- Follow steps 1 and 2 from the method above.
- Define the dictionary containing the JSON used to create the web map.
data = {
"operationalLayers": [{
"id": "layer_2382",
"layerType": "ArcGISMapServiceLayer",
"url": "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer",
"visibility": True,
"opacity": 1,
"title": "Census Data",
"layers": [{
"id": 0,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 0
}
},
"name": "Census Block Points",
"minScale": 99999.99998945338,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}, {
"id": 1,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 1
},
"drawingInfo": {
"renderer": {
"type": "simple",
"label": "",
"description": "",
"symbol": {
"color": [0, 0, 0, 0],
"outline": {
"color": [230, 230, 0, 255],
"width": 0.39975000000000005,
"type": "esriSLS",
"style": "esriSLSSolid"
},
"type": "esriSFS",
"style": "esriSFSSolid"
}
}
}
},
"name": "Census Block Group",
"minScale": 1000000,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}, {
"id": 2,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 2
},
"drawingInfo": {
"renderer": {
"type": "simple",
"label": "",
"description": "",
"symbol": {
"color": [0, 0, 0, 0],
"outline": {
"color": [230, 230, 0, 255],
"width": 0.5625,
"type": "esriSLS",
"style": "esriSLSSolid"
},
"type": "esriSFS",
"style": "esriSFSSolid"
}
}
}
},
"name": "Detailed Counties",
"minScale": 0,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}, {
"id": 3,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 3
},
"drawingInfo": {
"renderer": {
"type": "simple",
"label": "",
"description": "",
"symbol": {
"color": [0, 0, 0, 0],
"outline": {
"color": [230, 230, 0, 255],
"width": 2,
"type": "esriSLS",
"style": "esriSLSSolid"
},
"type": "esriSFS",
"style": "esriSFSSolid"
}
}
}
},
"name": "states",
"minScale": 0,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}
]
}
],
"baseMap": {
"baseMapLayers": [{
"id": "labels",
"layerType": "ArcGISTiledMapServiceLayer",
"url": "https://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Base/MapServer",
"visibility": True,
"opacity": 1,
"title": "World_Dark_Gray_Base"
}, {
"id": "base",
"layerType": "ArcGISTiledMapServiceLayer",
"url": "https://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Reference/MapServer",
"visibility": True,
"opacity": 1,
"title": "World_Dark_Gray_Reference"
}
],
"title": "Basemap"
},
"spatialReference": {
"wkid": 102100,
"latestWkid": 3857
},
"authoringApp": "WebMapViewer",
"authoringAppVersion": "10.6.1",
"version": "2.11"
}
- Create the new map.
item_properties_dict = {"type": "Web Map","title": "Test Map","tags": ["test","test1","test2"],"snippet":"This is a snippet", "text":data}
newmap = gis.content.add(item_properties = item_properties_dict)
newmap
The following shows the full script:
from arcgis.gis import GIS
from arcgis.mapping import WebMap
gis = GIS("https://earl.esri.com/portal","siteadmin","siteadmin", verify_cert=False)
print ("Successfully Logged Into GIS: ", gis)
data = {
"operationalLayers": [{
"id": "layer_2382",
"layerType": "ArcGISMapServiceLayer",
"url": "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer",
"visibility": True,
"opacity": 1,
"title": "Census Data",
"layers": [{
"id": 0,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 0
}
},
"name": "Census Block Points",
"minScale": 99999.99998945338,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}, {
"id": 1,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 1
},
"drawingInfo": {
"renderer": {
"type": "simple",
"label": "",
"description": "",
"symbol": {
"color": [0, 0, 0, 0],
"outline": {
"color": [230, 230, 0, 255],
"width": 0.39975000000000005,
"type": "esriSLS",
"style": "esriSLSSolid"
},
"type": "esriSFS",
"style": "esriSFSSolid"
}
}
}
},
"name": "Census Block Group",
"minScale": 1000000,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}, {
"id": 2,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 2
},
"drawingInfo": {
"renderer": {
"type": "simple",
"label": "",
"description": "",
"symbol": {
"color": [0, 0, 0, 0],
"outline": {
"color": [230, 230, 0, 255],
"width": 0.5625,
"type": "esriSLS",
"style": "esriSLSSolid"
},
"type": "esriSFS",
"style": "esriSFSSolid"
}
}
}
},
"name": "Detailed Counties",
"minScale": 0,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}, {
"id": 3,
"layerDefinition": {
"source": {
"type": "mapLayer",
"mapLayerId": 3
},
"drawingInfo": {
"renderer": {
"type": "simple",
"label": "",
"description": "",
"symbol": {
"color": [0, 0, 0, 0],
"outline": {
"color": [230, 230, 0, 255],
"width": 2,
"type": "esriSLS",
"style": "esriSLSSolid"
},
"type": "esriSFS",
"style": "esriSFSSolid"
}
}
}
},
"name": "states",
"minScale": 0,
"maxScale": 0,
"parentLayerId": -1,
"defaultVisibility": True
}
]
}
],
"baseMap": {
"baseMapLayers": [{
"id": "labels",
"layerType": "ArcGISTiledMapServiceLayer",
"url": "https://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Base/MapServer",
"visibility": True,
"opacity": 1,
"title": "World_Dark_Gray_Base"
}, {
"id": "base",
"layerType": "ArcGISTiledMapServiceLayer",
"url": "https://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Reference/MapServer",
"visibility": True,
"opacity": 1,
"title": "World_Dark_Gray_Reference"
}
],
"title": "Basemap"
},
"spatialReference": {
"wkid": 102100,
"latestWkid": 3857
},
"authoringApp": "WebMapViewer",
"authoringAppVersion": "10.6.1",
"version": "2.11"
}
item_properties_dict = {"type": "Web Map","title": "Test Map","tags": ["test","test1","test2"],"snippet":"This is a snippet", "text":data}
newmap = gis.content.add(item_properties = item_properties_dict)
newmap
The image below shows the newly created web map.
Related Information
Last Published: 8/23/2019
Article ID: 000019701
Software: ArcGIS API for Python 1.6.1, 1.6, 1.5.3, 1.5.2, 1.5.1, 1.5, 1.4.1, 1.4, 1.3, 1.2.4, 1.2.3, 1.2.2, 1.2.1, 1.2, 1.0.1, 1.0 ArcGIS GeoAnalytics Server 10.6.1, 10.6, 10.5.1, 10.5 ArcGIS GeoEvent Server 10.6.1, 10.6, 10.5.1, 10.5 ArcGIS Image Server 10.6.1, 10.6, 10.5.1, 10.5 ArcGIS Online Current, 7.1, 6.4, 6.3, 6.2, 6.1, 5.4, 5.3, 5.2, 5.1, 4.4 ArcGIS Server 10.6.1, 10.6, 10.5.1, 10.5 Portal for ArcGIS 10.6.1, 10.6, 10.5.1, 10.5