For a given AOI, this function produces two tables: an annual forest loss
table (in hectares, by default), and a table specifying 1) the total area of
pixels that experienced forest gain and, 2) the total area of pixels that
experienced both loss and gain over the full period (from 2000 through the
end date of the specific product you are using, depending on the chosen
data_year). Note that forest gain and combined loss and gain are not
available in the GFC product on an annualized basis. Use
extract_gfc to extract the GFC data for the AOI, and threshold
threshold_gfc prior to running this function.
gfc_stats(aoi, gfc, scale_factor = 1e-04, data_year = 2015)
one or more Area of Interest (AOI) polygon(s) as a
extract of GFC product for a given AOI (see
how to scale the output data (from meters). Defaults to .0001 for output in hectares.
which version of the Hansen data was used when
SpatialPolygons* object is not in the coordinate
gfc, it will be reprojected. If there is a "label"
attribute, it will be used to label the output statistics. Otherwise,
unique names ("AOI 1", "AOI 2", etc.) will be generated and used to label
the output. If multiple AOIs share the same labels, statistics will be
provided for the union of these AOIs.
list with two elements "loss_table", a
statistics on forest loss, and "gain_table", with the area of forest gain,
and area that experienced both loss and gain. The units of the output are
scale_factor is set to .0001).
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