Analyzers in EarthRanger work in the background to watch your incoming data and check whether it meets certain rules. When these conditions are met, the system can generate Events and trigger Alerts allowing you to respond rapidly to important field situations.

For example, a geospatial proximity analyzer can alert you when a tracked animal comes near a specific point on the map.

Types of Analyzers in EarthRanger 

EarthRanger offers several types of analyzers, each designed for a specific kind of monitoring logic. These fall into three general categories:

Geospatial and Proximity-Based Analyzers

These tools focus on location data and can trigger alerts when certain conditions are met—like when an animal enters a specific area (geofence).

These analyzers evaluate where a subject is in relation to physical locations, boundaries, or other subjects.

• Geofence Analyzers
  Trigger events when a subject crosses a virtual boundary (geofence), such as entering or exiting a restricted area.
• Feature Proximity Analyzers
  Alert when a subject gets within a defined distance of a physical feature, such as a waterhole, community, or road.
• Subject Proximity Analyzers
  Trigger events when two subjects—like vehicles, patrol units, or animals—come within a specific distance of each other for a configurable time.

Behavioral and Movement Pattern Analyzers

These analyzers monitor subject activity for irregular or important behavior patterns.

• Immobility Analyzers
  Detect when a subject stops moving beyond a defined threshold—potentially indicating a technical failure, injury, or mortality.
• Low-Speed Analyzers (Percentile Method)
  Identify unusually slow movement based on statistical speed percentiles. Useful for detecting fatigue, vehicle idling, or abnormal animal behavior.
• Low-Speed Analyzers (Wilcox Method)
  Apply the Wilcoxon signed-rank test to identify statistically significant slowdowns in movement.
• Subject Speed Profiles
  Analyze how a subject’s speed distribution compares to expected behavior over time, useful for flagging erratic or suspicious activity.
• Speed Distribution (Speed Distros)
  Monitor whether speed values fall outside expected ranges, identifying abnormal or rule-breaking travel behavior.

External Data and Environmental Analyzers

These analyzers bring in third-party datasets for more holistic analysis.

Google Earth Engine Analyzers
Leverage Earth observation data (e.g., NDVI, rainfall, fire) from Google Earth Engine to trigger Events when thresholds are crossed in a geographic area.

Global Forest Watch Subscriptions
Integrate with Global Forest Watch to monitor tree cover loss, alerts, or other environmental indicators tied to specific locations 

This section will guide you through specific analyzer types in more detail. You’ll learn:

• How to configure Geofence and Feature Proximity analyzers.
• How to set up Immobility or Speed based triggers.
• How to integrate with external data sources like GFW or Google Earth Engine.

Next in this series:  Detect Movement Anomalies with Immobility Analyzers