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* Metric Name: Structure Exposure Score  

* Tier: 1  

* Data Vintage: 08/2023. Includes disturbances through the end of 2022  

* Unit Of Measure: Relative index, 10 classes  

* Metric Definition and Relevance: This metric combines two data layers; one is the Wildland Urban Interface (WUI) as defined by Carlson et al. 2022 (see WUI definition section for more information), and a second data layer, Structure Exposure Score (SES), developed by Pyrologix LLC. The WUI includes the intermix and interface zones which collectively identify areas where structures occur and/or where structures are within a 1.5 miles wildland vegetation (see definition above) . The distance selected for the interface definition is based on research from the California Fire Alliance suggesting that this is the average distance firebrands can travel from an active wildfire front. 

Structure Exposure Score is an integrated rating of wildfire hazard that
includes the likelihood of a wildfire reaching a given location along with the
potential intensity and ember load when that occurs. SES varies considerably
across the landscape.

Pyrologix uses a standard geometric-interval classification to define the ten
classes of SES, where each class break is 1.5 times larger than the previous
break. So, homes located within Class X are 1.5 times more exposed than those
in Class IX, and so on. This metric represents SES for WUI areas only.

  1. 1 (SES I): 0
  2. 2 (SES II): 0.01 to 50
  3. 3 (SES III): 50 to 75
  4. 4 (SES IV): 75 to 113
  5. 5 (SES V): 113 to 169
  6. 6 (SES VI): 169 to 253
  7. 7 (SES VII): 253 to 380
  8. 8 (SES VIII): 380 to 570
  9. 9 (SES IX): 570 to 854
  10. 10 (SES X): 854+

  

* Creation Method:   

* Credits: Pyrologix, LLC \--James Newman (California State BLM Office) jnewman@blm.gov WUI, Carlson et al, 2022 \--Carlson, Amanda R., David P. Helmers, Todd J. Hawbaker, Miranda H. Mockrin, and Volker C. Radeloff