Look for complete geospatial metadata in this layer's associated xml document available from the download link

* Metric Name: Source of Ember Load to Buildings  

* Tier: 1  

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

* Unit Of Measure: Relative index  

* Represent element and pillar: No  

* Type and distribution of data: Right-skewed distribution representing index values. Raw data values range from 0 to 0.5.  

* Translation: Where is source of ember load to buildings lowest?  

* Translation method and outcome: Raw data values translated to range +1 to -1 representing more favorable or less favorable conditions, respectively. The proposition of more favorable is based on the objective of lower source of ember load to buildings (negative linear slope). More favorable (translated to +1) set at 0, less favorable (translated to -1) set at > 0.5.

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Figure . Histogram and scoring of source of ember load to buildings in
Southern California.

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Figure . Histogram of translated source of ember load to buildings in Southern
California.

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Figure . Maps displaying raw metric and translated metric source of ember load
to buildings in Southern California.

  

* Metric Definition and Relevance: The ember transport model used in WildEST tracks the travel of embers from each source pixel to downwind receiving pixels. The relative number of embers landing on a given receiving pixel is summed across all potential source pixels. If the receiving pixel has a nonzero WRC Building Cover value (meaning the pixel is within 75 m of a qualifying building), then we separately sum the relative number of embers from the source pixel. The final SELB raster represents the expected annual relative ember production that lands on building cover across all weather types.  

* Credits: Pyrologix, LLC \--James Newman (California State BLM Office) jnewman@blm.gov