1 is a remote sensing phase aimed at classifying
land into forest and non-forest
and taking spatial measurements
such as fragmentation, urbanization,
phase has historically been done
using aerial photography, but is changing
on satellite imagery.
2 consists of a
set of field sample locations distributed
across the landscape with approximately
location (FIA plot) every 6,000 acres.
Forested sample locations are visited
by field crews
who collect a variety of forest ecosystem
data. Non forest locations are also
visited as necessary
to quantify rates of land use change.
Forest Health Indicators:
3 consists of a subset of the phase two plots
1 every 96,000 acres) which
are visited during the growing
season in order to collect an
data including full vegetation
inventory, tree and crown condition,
coarse woody debris, and ozone damage.
Products Output Studies:
FIA conducts Timber Products Output (TPO) studies
to estimate industrial and non-industrial uses
of roundwood in a state. To estimate industrial
uses of roundwood, all primary wood-using mills
in a state are canvassed periodically.
National Woodland Owner Survey (NWOS)
To learn more about the National Woodland Owner Survey please visit
assessment (Resources Planning Act):
FIA currently provides updates of assessment
data every five years as required by the
Agriculture Research, Extension and Education
Reform Act of 1998 (Farm Bill).
Additional information is available in the FIA