USDA Forest Service

Forest Inventory and Analysis National Program


Forest Inventory & Analysis
National Office
U.S. Forest Service
1400 Independence Ave., SW
Washington, D.C. 20250-0003

(703) 605-4177

United States Department of Agriculture Forest Service.

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FIA Library

Database Documentation

The FIADB 8.0 Phase 2 user guide is now available. The Phase 3 user guide has not changed and version 6.0.1 is still valid. These documents describe all variables available in the FIA database. The P2 data represent plot, condition, and tree measurements taken on the standard FIA base grid, which is roughly 1 sample location per 6,000 acres. P3 data are the forest health indicator measurements taken on a subset of the P2 plots, roughly 1 sample location per 90,000 acres.

The FIADB user guide format has been revised. Each chapter is now numbered independently with a revision date on each page. This will make it possible for users to print specific chapters of interest, or in the future, only revised chapters. Please see the chapter titled User Guide Updates for complete information about the new format.

In addition, the population estimation information previously available in the FIADB user guide is now available as a separate document, The Forest Inventory and Analysis Database: Population Estimation User Guide (Edition: November, 2018). Please note that a new version of this document has been posted to correct minor errors in example 7.3 so the example script will now run properly.

FIADB User Guides

The Forest Inventory and Analysis Database:

Urban FIADB User Guides

The Urban Forest Inventory and Analysis Database:

Previous Versions of the User Guides




Note: Phase 2 and Phase 3 Version numbers coincide with the release of changes to the database. Most of these changes are minor, and occur within a short time period. Therefore, some version numbers are skipped, with the latest version encompassing all the changes since the last version. Versions released after 4.0 are 5.1 (Nov 2011), 5.1.1 (Feb 2012), 5.1.2 (July 2012), 5.1.4 (Nov 2012), 5.15 (Feb 2013), 5.1.6(June 2013).

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USDA Forest Service
Last Modified: March 5, 2019

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