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Azure Maps as an Event Grid source

  • Artikkeli

This article provides the properties and schema for Azure Maps events. For an introduction to event schemas, see Azure Event Grid event schema. It also gives you a list of quick starts and tutorials to use Azure Maps as an event source.

Available event types

An Azure Maps account emits the following event types:

Event type Description
Microsoft.Maps.GeofenceEntered Raised when coordinates received have moved from outside of a given geofence to within
Microsoft.Maps.GeofenceExited Raised when coordinates received have moved from within a given geofence to outside
Microsoft.Maps.GeofenceResult Raised every time a geofencing query returns a result, regardless of the state

Example events

The following example shows the schema of a GeofenceEntered event

{   
   "id":"7f8446e2-1ac7-4234-8425-303726ea3981", 
   "source":"/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Maps/accounts/{accountName}", 
   "subject":"/spatial/geofence/udid/{udid}/id/{eventId}", 
   "data":{   
      "geometries":[   
         {   
            "deviceId":"device_1", 
            "udId":"1a13b444-4acf-32ab-ce4e-9ca4af20b169", 
            "geometryId":"2", 
            "distance":-999.0, 
            "nearestLat":47.618786, 
            "nearestLon":-122.132151 
         } 
      ], 
      "expiredGeofenceGeometryId":[   
      ], 
      "invalidPeriodGeofenceGeometryId":[   
      ] 
   }, 
   "type":"Microsoft.Maps.GeofenceEntered", 
   "time":"2018-11-08T00:54:17.6408601Z", 
   "specversion":"1.0" 
}

The following example show schema for GeofenceResult

{   
   "id":"451675de-a67d-4929-876c-5c2bf0b2c000", 
   "source":"/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Maps/accounts/{accountName}", 
   "subject":"/spatial/geofence/udid/{udid}/id/{eventId}", 
   "data":{   
      "geometries":[   
         {   
            "deviceId":"device_1", 
            "udId":"1a13b444-4acf-32ab-ce4e-9ca4af20b169", 
            "geometryId":"1", 
            "distance":999.0, 
            "nearestLat":47.609833, 
            "nearestLon":-122.148274 
         }, 
         {   
            "deviceId":"device_1", 
            "udId":"1a13b444-4acf-32ab-ce4e-9ca4af20b169", 
            "geometryId":"2", 
            "distance":999.0, 
            "nearestLat":47.621954, 
            "nearestLon":-122.131841 
         } 
      ], 
      "expiredGeofenceGeometryId":[   
      ], 
      "invalidPeriodGeofenceGeometryId":[   
      ] 
   }, 
   "type":"Microsoft.Maps.GeofenceResult", 
   "time":"2018-11-08T00:52:08.0954283Z", 
   "specversion":"1.0" 
}

Event properties

An event has the following top-level data:

Property Type Description
source string Full resource path to the event source. This field isn't writeable. Event Grid provides this value.
subject string Publisher-defined path to the event subject.
type string One of the registered event types for this event source.
time string The time the event is generated based on the provider's UTC time.
id string Unique identifier for the event.
data object Geofencing event data.
specversion string CloudEvents schema specification version.

The data object has the following properties:

Property Type Description
apiCategory string API category of the event.
apiName string API name of the event.
issues object Lists issues occurred during processing. If any issues are returned, then there will be no geometries returned with the response.
responseCode number HTTP response code
geometries object Lists the fence geometries that contain the coordinate position or overlap the searchBuffer around the position.

The error object is returned when an error occurs in the Maps API. The error object has the following properties:

Property Type Description
error ErrorDetails This object is returned when an error occurs in the Maps API

The ErrorDetails object is returned when an error occurs in the Maps API. The ErrorDetails or object has the following properties:

Property Type Description
code string The HTTP status code.
message string If available, a human readable description of the error.
innererror InnerError If available, an object containing service-specific information about the error.

The InnerError is an object containing service-specific information about the error. The InnerError object has the following properties:

Property Type Description
code string The error message.

The geometries object lists geometry IDs of the geofences that have expired relative to the user time in the request. The geometries object has geometry items with the following properties:

Property Type Description
deviceid string ID of device.
distance string

Distance from the coordinate to the closest border of the geofence. Positive means the coordinate is outside of the geofence. If the coordinate is outside of the geofence, but more than the value of searchBuffer away from the closest geofence border, then the value is 999. Negative means the coordinate is inside of the geofence. If the coordinate is inside the polygon, but more than the value of searchBuffer away from the closest geofencing border, then the value is -999. A value of 999 means that there's great confidence the coordinate is well outside the geofence. A value of -999 means that there's great confidence the coordinate is well within the geofence.
geometryid string The unique ID identifies the geofence geometry.
nearestlat number Latitude of the nearest point of the geometry.
nearestlon number Longitude of the nearest point of the geometry.
udId string The unique ID returned from user upload service when uploading a geofence. Won't be included in geofencing post API.

The data object has the following properties:

Property Type Description
expiredGeofenceGeometryId string[] Lists of the geometry ID of the geofence that is expired relative to the user time in the request.
geometries geometries[] Lists the fence geometries that contain the coordinate position or overlap the searchBuffer around the position.
invalidPeriodGeofenceGeometryId string[] Lists of the geometry ID of the geofence that is in invalid period relative to the user time in the request.
isEventPublished boolean True if at least one event is published to the Azure Maps event subscriber, false if no event is published to the Azure Maps event subscriber.

Tutorials and how-tos

Title Description
React to Azure Maps events by using Event Grid Overview of integrating Azure Maps with Event Grid.
Tutorial: Set up a geofence This tutorial walks you through the basics steps to set up geofence by using Azure Maps. You use Azure Event Grid to stream the geofence results and set up a notification based on the geofence results.

Next steps