Immobility Analyzers in EarthRanger detect when a tracked subject has stopped moving for an unusual amount of time. They automatically generate events and alerts when this lack of movement occurs and when the subject resumes movement.

This helps teams identify:

• Potential injury, illness, or mortality in tracked wildlife
• Technical issues with collars or tracking devices
• Stationary behavior changes in vehicles or teams

EarthRanger evaluates mobility each time a location update is received. If a subject remains within a specified radius or time duration, an immobility event is generated. Events are also generated if the subject becomes mobile again (i.e., moves beyond the specified radius). A user can receive alerts about a subject's mobility/immobility status by subscribing to an alert notification for the Immobility and Immobility (All Clear) events. 

Creating an Immobility Analyzer

1. Create a subject group (if it doesn’t already exist) with the sensors you want to monitor.
2. Add an Immobility Analyzer:
   • Go to Home > Analyzers > Immobility Analyzer, then select Add Immobility Analyzer.
   • On the Add Immobility Analyzer page, enter a unique, descriptive name (e.g., "Elephant Immobility Alert").
   • Select the subject group from Step 1.
   • Click Save.
3. Add an Immobility Event Type (if it doesn’t already exist):
   • Go to Home > Activity > Event Types, then select Add Event Type.
   • On the Add Event Type page, enter the following:
     • Display: Immobility
     • Value: immobility
     • Category: Analyzer Event
     • Default Priority: Select Gray (default), Green, Amber, or Red.
     • Schema: Paste the Immobility Schema (refer to the table below).
   • Click Save.
4. Add an Immobility All Clear Event Type (if it doesn’t already exist):
   • Repeat the steps above but use:
     • Display: Immobility All Clear
     • Value: immobility_all_clear
     • Schema: Paste the Immobility All Clear Schema (refer to the table below).

Schemas: Immobility and Immobility All Clear

{
"schema": {
"$schema": "http://json-schema.org/draft-
04/schema#",
"title": "EventType Immobility",
"type": "object",
"properties": {
"details": {
"type": "string",
"title": "Details"
},
"name": {
"type": "string",
"title": "Name of animal"
},
"cluster_fix_count": {
"type": "number",
"title": "Cluster Fix Count"
},
"total_fix_count": {
"type": "number",
"title": "Total Fix Count"
},
"cluster_radius": {
"type": "number",
"title": "Cluster Search Radius"
},
"probability_value": {
"type": "number",
"title": "Probability"
}
}
},
"definition": [
"name",
"details",
"probability_value",
"total_fix_count",
"cluster_fix_count",
"cluster_radius"
]
}

{
"schema": {
"$schema": "http://json-
schema.org/draft-04/schema#",
"title": "EventType Immobility",
"type": "object",
"properties": {
"details": {
"type": "string",
"title": "Details"
},
"name": {
"type": "string",
"title": "Name of animal"
},
"cluster_fix_count": {
"type": "number",
"title": "Cluster Fix Count"
},
"total_fix_count": {
"type": "number",
"title": "Total Fix Count"
},
"cluster_radius": {
"type": "number",
"title": "Cluster Search Radius"
},
"probability_value": {
"type": "number",
"title": "Probability"
}
}
},
"definition": [
"name",
"details",
"probability_value",
"total_fix_count",
"cluster_fix_count",
"cluster_radius"
]
}

Next in this series: Configure Geofence Analyzers