Tracking Forest Inventory

Accurate supply numbers

The map and graphs on this page present data from the USDA Forest Service on current and historic forest conditions in the Southeast U.S. and in each of Enviva’s forest supply areas. The total forest area in the Southeast U.S. has stabilized since 2000, while forest inventories have increased significantly.

Counties are shaded according to the percentage of their total land area that is currently forested. The darker green represents counties with a greater proportion of forestland. The graphs below display forest area and inventory over time. Select your Enviva forest supply area of interest for greater detail.

 

Track & Trace

Data & Methods

The sections below describe in detail the data sources and methods used to generate the maps and other summary statistics presented throughout each section of the Track & Trace® website.

  • Forest Trend Map Data Sources & Methods

    Map Data Source: FIA

    The data displayed on the Forest Trend Map page are from the USDA Forest Service’s Forest Inventory and Analysis (FIA) program for the inventory time periods covering 2000 through 2016. The summary charts below the map show estimates of total forest area (in acres) and forest growing stock inventory, or the volume of live trees above 5 inches in diameter at breast height growing in the forest (in cubic feet). The forest area data were also used to fill each county on the map with varying shades of green according to the total percentage of the county area covered in forest.

    FIA Program

    The FIA program collects data on U.S. forest extent and conditions using field measurements gathered from a fixed set of field plots throughout the country. The program maintains one field plot site for every 6,000 acres, and 15-20 percent of the plots are revisited every year. This means that the “2016” annual inventory data, for example, might represent plot measurements collected during the 2011–2016 survey cycle. However, because inventory changes slowly, small differences in measurement years are usually insignificant.

    Filling in FIA Data Gaps

    Because the FIA annual inventory system was not fully implemented until recently, there are occasional years for individual states where data are missing or incomplete. For years within the time frame of this analysis (2000-2016) for which there are no FIA data available, data from the most recent adjacent year in that state are substituted. The table below shows where substitutions were made, with a “×” noting years for which concurrent inventory data are available. For years where concurrent inventory data are not available, the substitute data year that was used as proxy is listed.

    AL AR FL GA KY LA MS NC SC TN VA WV
    2000  × 2005 2004  × 2004 2008 2006 2002 2001  × 2001  ×
    2001  × 2005 2004  × 2004 2008 2006 2002  ×  ×  × 2000
    2002  × 2005 2004  × 2004 2008 2006  ×  ×  ×  × 2000
    2003  × 2005 2004  × 2004 2008 2006  ×  ×  ×  × 2000
    2004  × 2005  ×  ×  × 2008 2006  ×  ×  × 2003  ×
    2005  ×  × 2004  ×  × 2008 2006  ×  ×  ×  ×  ×
    2006  ×  × 2004  ×  × 2008  ×  ×  ×  ×  ×  ×
    2007  ×  ×  ×  ×  × 2008 2006  ×  ×  ×  ×  ×
    2008  ×  × 2007  ×  ×  × 2006 2007  ×  × ×  ×
    2009  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×
    2010  ×  × ×  ×  ×  ×  ×  ×  ×  ×  ×  ×
    2011  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×
    2012  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×  ×
    2013  ×  ×  ×  ×  × ×  ×  ×  ×  ×  ×  ×
    2014  ×  ×  ×  × ×  ×  ×  ×  × ×  ×  ×
    2015  × × × × × ×  ×  ×  × × ×  ×
    2016  × × × × 2015 ×  ×  ×  × 2015 ×  ×