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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Data and Tools

User Alert:

June 16, 2015: The ratio estimate option (i.e. the option to choose a denominator) is returning incorrect estimates for any ratio involving net growth, mortality, or removals on timberland. Ratio estimates involving net growth, mortality, or removals on forest land are working correctly. Ratio estimates are intended to be restricted to timberland-to-timberland or forest land-to-forest land observations but the restriction is currently malfunctioning for timberland-to-timberland observations. Users may add the following to the numerator and denominator filter boxes to correct for the problem and obtain correct estimates for timberland-to-timberland ratios: and pcond.cond_status_cd = 1 and pcond.reservcd = 0 and pcond.siteclcd in (1,2,3,4,5,6) and cond.cond_status_cd = 1 and cond.reservcd = 0 and cond.siteclcd in (1,2,3,4,5,6).

We are working on the problem and will update the user alert when it is resolved.

The EVALIDator is unable to produce estimates of growth, removals and mortality for multiple inventories when "Trend analysis" is chosen as the row classification variable and the inventories chosen have different sampling designs (i.e., a mix of periodic and annual inventories). In the event that a user inadvertently runs such a retrieval the EVALIDator will return zeroes for the periodic inventories and the correct numbers for the annual inventories. We are sorry for any inconvenience.

FIADB was updated in June 2014 to include the new updated interpretation of the definition of reserved status. All annual data was reanalyzed in accordance with this interpretation and some previously published values have changed as a result. Change estimates were recomputed to account for any modifications. For more details please consult the FIADB User's Guide (

For more information contact any of the following:

Jim Menlove RMRS ( 801-625-5426

Sharon Stanton PNW ( 503-808-2019

Charles Barnett NRS ( 610-557-4031

Carol Perry SRS ( 865-862-2087

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Forest Inventory Data Online –
Create your own forest inventory tables and maps.



This program allows users to produce a large variety of population estimates and their sampling errors based on the current FIADB.



Download raw data, Microsoft Access databases, FIADB Users Manuals, and access standard tables and recent data load history.

Reporting Tools


Create reports and maps using other online tools, including the Timber Products Output (TPO) Reporting tool, and the National Woodland Owner Survey Table Maker. A link to the Forest Vegetation Simulator (FVS) pre-processor tool for FIA data.



Learn how to use our online tools through presentations, example exercises and tutorials. Sign up for the next scheduled training session.



Contacts for questions or problems.

To learn more about what types of data that FIA collects and the processes we use, please review the FIA Data Collection Fact Sheets found in the FIA Library.

USDA Forest Service
Last Modified: August 3, 2015