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)