Skip to main content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

GIS & Spatial Analysis

Risk and Hazard Mapping

The GIS and Spatial Analysis program at FHAAST provides support for both tactical and strategic forest health risk assessments. In addition, this program coordinates, in collaboration with the USDA Forest Service Forest Health Monitoring program (FHM), the development of a National Insect and Disease Risk Map (NIDRM) and database.

The primary goal of NIDRM is to provide Congress, USDA officials, and federal and state land managers with a periodic strategic assessment of risk of tree mortality due to major insects and diseases. NIDRM is more than “just a map”, it represents a compendium of about 190 individual risk models, all constructed within a common GIS-based multi-criteria framework that can account for regional variations in forest health concerns.

The multi-criteria framework, used by FHAAST for the development of NIDRM and other risk assessments, provides a consistent, repeatable, transparent process. This process enables interactive spatial and temporal risk assessments to be conducted at various levels to aid in decision making thus enhancing the utilization and maintenance of forest health risk maps within and outside the National Forest System.

Access our 2018 update to the (2013 – 2027) NIDRM assessment.