FIA Evalidator

Forest Inventory and Analysis Program (FIA)

Background:  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. The FIA program has also expanded to include the sampling of urban trees on all land use types in select cities. 

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.

Forest Inventory and Analysis – Data and Tools (


Use the EVALIDator to generate a report of area in forestland (in acres) for congressional districts in Georgia

Screen 1:

  • Tick ‘State retrevial’
  • Select your ‘Forestland’ in the Land Basis drop-down
  • Choose ‘Area ‘ for your numerator
  • Leave ‘No denominator – just produce estimate.’ selected in the second dropdown.  You will not be creating ratio estimates

Screen 2:

  • Use FIA definition of forest land
  • Tick the ‘Limit retrevial to only most recent inventories’
  • Hit ‘Continue’

Screen 3:

  • Select ‘…GEORGIA…’ in the list of states
  • Hit ‘Continue’

Screen 4:

  • Select ‘None’ for PAGE VARIABLE
  • Select ‘Congressional District’ for ROW VARIABLE
  • Select ‘Ownership group – Major’ for COLUMN VARIABLE
  • Hit ‘Continue’

Screen 4:

  • Your results are shown in a series of tables
    • Estimate:
    • Sampling error percent:
    • Number of non-zero plots in estimate:
  • Copy estimate (and other tables if interested) and paste into Excel


FIA Evalidator User Guide (Version

FIA Database User Manual (Version 4.0, Phase 2)

  • Phase 1 and Phase 2 sampling (page 8)
  • Plot location (page 9)
  • Plot design, condition delineation, and types of data attributes (page 10)
  • Accuracy Standards (page 14)

Texas Forest Service Fact Sheet (w/ pretty good explanation of FIA sampling error)

Congressional district GIS boundary download

Print Friendly, PDF & Email