Parent Layer: Functional

Name: Time Since Last Fire normalized

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Description: 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.----------------This raster has been modified from the base 30m version in the following ways:-------- - It has been aggregated from a 30m to a 300m scale by averaging across the 30m values-------- - The normalized values are rescaled based on the comparison of TSLF to the mean fire return interval (FRI; from the FRID map) for a given location. The formula for the comparison depends on if the TSLF is greater or less than the mean reference FRI (meanRefFRI).--------If the TSLF > meanRefFRI, then (TSLF/meanRefFRI-1)*100. This will result in a positive percent value.--------If the TSLF < meanRefFRI, then TSLF/meanRefFRI*-1*100. This will result in a negative percent value.--------These percentages are then normalized using the following thresholds to reflect the degree to which fire is too infrequent:--------1 is assigned to all values < 33% (including all negative percentages)---------1 is assigned to all values >67%--------Values between 33% and 67% will range from -1 to 1 in a linear manner.--------This interpretation reflects concerns for fire being too infrequent, with delinquency greater than 1/3 of the average fire return interval considered to be more favorable than longer periods of delinquency. We did not create a commensurate reference condition for too frequent fire, but it could be done using the same general premise.----------------- Unit Of Measure: Years

Copyright Text: CALFIRE: The State of California and the Department of Forestry and Fire Protection make no representations or warranties regarding the accuracy of data or maps. The user will not seek to hold the State or the Department liable under any circumstances for any damages with respect to any claim by the user or any third party on account of or arising from the use of data or maps. The user will cite the Department of Forestry and Fire Protection as the original source of the data, but will clearly denote cases where the original data have been updated, modified, or in any way altered from the original condition.--------------------------------USDA Forest Service - Region 5 and Pacific Southwest Research Station (PSW): The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness, or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.

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