UTRI Data
Data layers needed:
•Street network
•Critical facilities
•Population
•Tree canopy
Data layers needed:
•Street network
•Population
•Tree canopy
•Critical facilities

Tree risk zones:
•Trees
•Roads & streets
•Occupancy
•people
•places or sites (buildings)

Risk zones are based on the principal component of transportation as it affects public safety and response.  Street segments (i.e. from intersection to intersection) are the primary component of analysis; but the tree canopy resolution (e.g. 30 meters) determines the detail of the final UTRI rating map.

The tree canopy layer substitutes initially as the “trigger” for areas of potential risk (related to vegetation).

These characteristics are ranked and then summed ( a GIS process) to create rating for each street segment.

The “No target, No risk” concept applies for disaster planning.  Targets in the disaster context are narrowly defined.
In addition, streets and facilities with little or no tree canopy are rated as “low risk” in the UTRI model.

Disaster-related outcomes from a well designed and implemented tree risk management plan, or from the UTRI “fast track”.

Outcome based measurements & evaluation:
•Increased public safety
•Improved tree health

Indicators (for measurement):
•Decline in number of high-risk trees over time
•Reduction in number of trees needing hazard pruning
•Reduction in number of “interruptions” during a disaster
•Reduction in storm damage (debris)