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Phase 2 (Red) Alerts

The triggering of a Phase 1 Yellow Warning automatically causes the sensors to run a Phase 2 Fire Detection procedure. This process attempts to determine if the observed deterioration in Air Quality is from a smoldering fire or some other source.

Phase 2 Red Alert sent to Silvanet Cloud

Phase 2 Red Alert sent to Silvanet Cloud


A smoldering fire is defined to be a slow, flameless combustion of a biomass material such as forest floor material, branches, leaves

Phase 2 Detection Process is as follows:

  1. Gas sensor runs six gas scans:

    The gas sensor automatically performs 6 consecutive gas scans which takes 1-3 minutes to complete. During the gas scan, the sensor measures hydrogen, carbon monoxide and other Volatile Organic Compounds (VOCs).

  2. Results compared to a ML Model on the sensor:

    The Silvanet sensor uses a Machine Learning (ML) model to compare the gas scan measurements with pre-trained models to reliably detect the gas composition typical for a wildfire. The ML process begins by taking readings from the gas sensor (gas scans) to determine if the observed disturbances can be classified as wildfire smoke.


    Each scan consists of 10 individual measurements of the raw resistance values taken at different temperatures. The ML model deployed on the sensor takes these 6 x 10 measurements as input to determine whether the observed disturbance can be classified as wildfire smoke.

  3. A positive result triggers a Phase 2 Alert:

    If the ML model determines that the gas detected is a fire, the Silvanet sensor immediately sends a Phase 2 (Red) Alert.

    Fire alert process

    Fire alert process


    Models are pre-trained in the Dryad laboratory and can be fine-tuned / programmed specifically for the species of trees present in a particular deployment. Updated models can be remotely installed in the sensors by Dryad’s support team.

  4. Fire Alerts are sent immediately:

    Phase 2 Red alerts initiate a packet stream where Fire alerts data packets are sent via the Mesh Network to the Silvanet Cloud.

  5. Fire notifications sent to users:

    The Silvanet Cloud then initiates an email alert notification to the user's email account. A blinking Fire alert icon appears in the Site Management app belonging to the user's Dryad account.


After the sensor performs the 6 gas scans, it needs 1 to 2 hours for the sensor to return to baseline. While it is returning to baseline, it cannot take in any additional data to detect fires.

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