Parent Layer: Timber_HighHazardZones (Calfire data)

Name: Tier1_NFL_TimberSuitable

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Description: Tier One High Hazard Zones are areas where assets to be protected and tree mortality directly coincide. 1-2017 Update:The Tier 1 High Hazard Zones have been updated using the most current Aerial Detection Survey (ADS) released in November, 2016________________________________________________________________________________________________8-2016 UpdateTier 1 high hazard zones (HHZ) are the areas where tree mortality directly coincides with critical infrastructure. We originally delineated Tier 1 HHZ in December of 2015 using Aerial Detection Survey data from 2012 through October of 2015. In May of 2016 the USFS flew a new flight of the Aerial Detection Survey that was limited to lower elevations of the Sierra Nevada, Easter Cascades, and the Transverse ranges. This update of Tier 1 HHZ includes the new mortality flown in May of 2016. Additionally, it includes improved layers for critical infrastructure:Utilities – utility companies from around the state contributed data to improve the location of their assets. CAL FIRE also contributed point locations for vital critical infrastructure.Recreation – the USFS contributed data to improve the location of their recreation facilities. Local Facilities – point locations for public schools, libraries, fire stations, and other local public buildings were added. Water Conveyances – in addition to utilities contributing their critical water infrastructure, we added aqueducts, flumes, canals, and penstocks. Roads – Mariposa county contributed an improved roads layer; the USFS provided USFS-designated roads for HHZ.________________________________________________________________________________________________CAL FIRE mapped Tier One High Hazard Zones by identifying assets to be protected as: communities, powerlines, roads, communication structures, and recreation facilities as well as miscellaneous other critical infrastructure. These assets to be protected were buffered. Communities were buffered by 1,000 feet and all other assets were buffered by 200 feet. Tree Mortality data was provided by the USDA Forest Service Forest Health Protection staff Aerial Detection Surveys from 2012-2015.Field review and revision is neede to refine and finalize HHZ areas. These zones will be periodically updated to relfect new mortality or infrastructure assets at risk.d

Copyright Text: CAL FIRE

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  Label: Hazzard (Tier 1) Suitable* NF
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