Fire Return Interval Departure (Frid) - Current Fire Return Interval - Since 1908

The fire return interval departure (FRID) analysis quantifies the difference between current and pre-settlement fire frequencies, allowing managers to target areas at high risk of threshold-type responses owing to altered fire regimes and interactions with other factors. This is a measure of the extent to which contemporary fires (i.e. since 1908) are burning at frequencies similar to the frequencies that occurred prior to Euro-American settlement.

Data and Resources

Additional Info

Field Value
Version Version 5.0
Last Updated March 28, 2025, 08:36 (UTC)
Created March 7, 2025, 07:52 (UTC)
categorical_values {"115": 155436793, "58": 66122472, "38": 28072682, "29": 10088764, "23": 3375486, "19": 1190683, "16": 407821, "14": 130540, "13": 48413, "12": 17678, "10": 9312, "9": 121}
category /Fire Dynamics/Functional Fire/Fire Return Interval Departure (FRID)
collection_name California Landscape Metrics
creation_method Current fire return interval 1908 is calculated by dividing the number of years in the fire record by the number of fires occurring between 1908 and the current year in a given polygon plus one. CurrentFRI = Number of years/Number of Fires +1
data_units Average Years
data_vintage 2022. Includes disturbances through the end of 2022.
date_updated August 2024
element Functional Fire
encoding utf8
file_name FRI_Current_19082022_202401_T1_v5
format GeoTiff
harvest_object_id 6642758c-dd74-429d-be7d-01da8dc3815e
harvest_source_id a2637971-af12-457f-ae4a-831d2202a539
harvest_source_title WIFIRE Commons
maximum_value 115.0
metric_definition_and_relevance The fire return interval departure (FRID) analysis quantifies the difference between current and pre-settlement fire frequencies, allowing managers to target areas at high risk of threshold-type responses owing to altered fire regimes and interactions with other factors. This is a measure of the extent to which contemporary fires (i.e. since 1908) are burning at frequencies similar to the frequencies that occurred prior to Euro-American settlement.
minimum_value 9.0
pillar Fire Dynamics
spatial {"type": "Polygon", "coordinates": [[[-124.5090833859125, 32.4242698701859], [-113.49380570277376, 32.4242698701859], [-113.49380570277376, 42.1119747450123], [-124.5090833859125, 42.1119747450123], [-124.5090833859125, 32.4242698701859]]]}
sub_element Fire Return Interval Departure (FRID)
tier 1