Understory

This document describes the standards, codes, methods, and definitions for urban Forest Inventory and Analysis (FIA) field data items. It describes FIA field procedures that are consistent and uniform across urban FIA units nationwide, along with some regionally-specific variables.

This manual documents data collection procedures, codes, standards, and definitions used by the Pacific Northwest Research Station, Forest Inventory and Analysis (PNW-FIA) program in the 2026 annual forest inventory of California, Oregon, and Washington.

This manual documents data collection procedures, codes, standards, and definitions used by the Pacific Northwest Research Station, Forest Inventory and Analysis (PNW-FIA) program in the 2026 annual forest inventory of Alaska.

This manual documents data collection procedures, codes, standards, and definitions used by the Pacific Northwest Research Station, Forest Inventory and Analysis (PNW-FIA) program in the 2026 periodic forest inventory of the Commonwealth of the Northern Mariana Islands.

The Forest Inventory and Analysis (FIA) program of the Forest Service conducts the National Woodland Owner Survey (NWOS) to quantify:Who owns the forests of the United States,Why the forests are owned,How the forests are used, andWhat the intended future uses of the forests are.The NWOS serves as the social complement to the biophysical forest inventories and economic mill surveys FIA conducts to provide a thorough view of the nation’s forests.

New publications from RMRS during October to December 2025.

New publications from RMRS during July to September 2025.

New publications from RMRS during April - June 2025.