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* Metric Name: Time Since Last Fire  

* Tier: 2  

* Data Vintage: 2022. Includes disturbances through the end of 2022  

* Unit Of Measure: Years  

* Represent element and pillar: No  

* Type and distribution of data: Left-skewed, beta-like distribution representing percentages. Raw data values range from 0 to 114 years.  

* Translation: Where has fire occurred within the fire return interval?  

* Translation method and outcome: Raw data values translated to range from +1 to -1 representing more favorable to less favorable conditions, respectively. **** The proposition of more favorable is based on the objective of being < 133% of the average fire return interval (i.e., mean FRI + (0.333 * mean FRI)). More favorable (translated to +1) set at time since last fire being no more than 33% longer than the average fire return interval, less favorable (translated to -1) set at > 67% longer than the average fire return interval. 

Figure . Histogram and scoring criterion of time since last fire, across the
Central Coast.

Figure . Histogram of translated time since last fire, across the Central
Coast.

Figure . Maps displaying raw metric and translated metric time since last
fire, across the Central Coast.

  

* Metric Definition and Relevance: Time Since Last Fire (TSLF), from the Fire Return Interval Departure (FRID) map, provides information (in years) to indicate the length of time since an area last burned.  

* Credits: Fire History (2022), CAL FIRE; Existing Vegetation (CALVEG 2011), Region 5, MARS Team