Forest Inventory &
U.S. Forest Service
1601 North Kent Street,
Arlington, VA 22209
Click here for the latest user alerts.
March 11, 2014
We have discovered an issue in our calculation of sampling error estimates. Currently, sampling error estimates in EVALIDator are only valid when “trend analysis” is selected as the row variable. Population totals and ratio estimates from EVALIDator are valid and are not affected by this error. Estimates from FIDO are not affected.
We expect to correct this problem by late April 2014.
Thank you for your patience. Please check here for further information and updates.
FIADB 5.1.6 - has been released. You may notice changes in FIADB tables, FIDO, EVALIDator and the DataMart. Some new tables may not contain data until the 2012 field data are processed.
Welcome to our site
We are the Nation's Forest
The Forest Inventory and Analysis
(FIA) Program of the U.S. Forest Service
provides the information needed
to assess America's forests.
As the Nation's continuous forest census, our program projects
how forests are likely to appear 10 to 50 years from now.
This enables us to evaluate whether current forest management
practices are sustainable in the long run and to assess
whether current policies will allow the next generation
to enjoy America's forests as we do today.
FIA reports on status and trends in forest area
and location; in the species, size, and health of trees;
in total tree growth, mortality, and removals by harvest; in
wood production and utilization rates by various products;
and in forest land ownership.
The Forest Service has significantly enhanced the FIA
program by changing from a periodic survey to an annual
survey, by increasing our capacity to analyze and publish
data, and by expanding the scope of our data collection
to include soil, under story vegetation, tree crown conditions,
coarse woody debris, and lichen community composition
on a subsample of our plots.
FIA is managed by the Research and Development organization
within the USDA Forest Service in cooperation with State
and Private Forestry and National Forest Systems. FIA traces it's origin back to the McSweeney - McNary Forest Research Act of 1928 (P.L. 70-466). This law initiated the first inventories starting in 1930.