pFRID 2023 – Fire Regime Interval Departure
Probabilistic estimates of fire regime departure for 17 western U.S. states, representing how contemporary fire intervals differ from modeled historical conditions.
About this dataset
Percent Fire Regime Interval Departure (pFRID) characterizes how much contemporary fire intervals deviate from modeled historical conditions across 17 western U.S. states. Using burn probability, historical fire reconstructions, and statistical tests of significance, pFRID highlights where modern fire regimes are burning more or less frequently than expected under long-term ecological baselines. The 2023 release includes multiple methodological variants to support different analytical and management needs, including a VP analytical approach, a Safford et al.–based method, and a statistically masked product showing only significant deviations.
What’s included in this dataset
How to interpret this layer
• pFRID 2023 — Significant Departures – raster layer masked to display only statistically significant fire regime deviations (p ≤ 2.5% or ≥ 97.5%).
• pFRID 2023 — VP Analytical Approach – probabilistic estimates of fire regime departure using Vibrant Planet’s statistical methodology.
• pFRID 2023 — Safford et al. Methodology – departure surface computed from Safford et al.'s approach using historic presettlement fire regime baselines.
All products reflect percent deviation from expected historical fire return intervals.
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pFRID 2023 – Fire Regime Interval Departure
Probabilistic estimates of fire regime departure for 17 western U.S. states, representing how contemporary fire intervals differ from modeled historical conditions.
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pFRID 2023 – VP Analytical Approach
Percent fire regime interval departure calculated using Vibrant Planet’s analytical approach, integrating probabilistic modeling and historical baselines.
pFRID 2023 – Significant Departures
Raster highlighting statistically significant fire regime interval departures using a two-tailed p-value mask (≤2.5% or ≥97.5%).
pFRID 2023 – Safford et al. Methodology
Percent fire regime interval departure calculated using Safford et al.'s presettlement baseline methodology.
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pFRID 2023 – VP Analytical Approach
Percent fire regime interval departure calculated using Vibrant Planet’s analytical approach, integrating probabilistic modeling and historical baselines.
pFRID 2023 – Significant Departures
Raster highlighting statistically significant fire regime interval departures using a two-tailed p-value mask (≤2.5% or ≥97.5%).
pFRID 2023 – Safford et al. Methodology
Percent fire regime interval departure calculated using Safford et al.'s presettlement baseline methodology.
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Licensing & Attribution
Licensed under Creative Commons Attribution–NonCommercial–ShareAlike 4.0 International (CC BY-NC-SA 4.0).
You may share and adapt this dataset for noncommercial purposes with attribution under the same license.
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© 2025 Vibrant Planet. Distributed by Vibrant Planet Data Commons. Licensed under CC BY-NC-SA 4.0.
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