FIA Inventory
Originally,
the region's forests were inventoried one State at a time,
progressing from State to State until all the forests in the
region had been surveyed and the cycle began again. These periodic
inventories began in the 1930's, and most of our States have
been inventoried at least four times since then.
In 1998 Congress mandated that we switch from periodic to annual inventories.
In an annual inventory, about 20 percent of the plots in a State are visited
every year and each plot is revisited every 5 years. This annual inventory
system allows for completed regional coverage every year and a 5-year reporting
cycle. Concurrent with the switch to annual inventories, we began to assess
forest health by incorporating the plot component of the National
Forest Health Monitoring Program.
To learn more about FIA Inventory click
here.
Timber Products Output
TPO is a survey based system that was originally devised to
provide an estimate of current removals from timberlands. Because
of the periodic nature of past FIA field surveys, they could
only provide an estimate of average removals. TPO was developed
to provide another estimate for removals and also to provide
further information as to where the wood was processed and
into what product category.
To learn more about Timber Products Output (TPO) click
here.
TPO to the rescue
Containment and eradication strategies were developed in the battle against
the Emerald Ash Borer infestation that was discovered near Detroit in
July 2002 by using TPO
data and maps.
To learn more about the Emerald Ash Borer
click here.
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