Secondary Forest was classified using the SVVI MVC product. A
threshold of 50 was used, and values less than or equal to this value
were classified as potentially Secondary Forest in the same manner as
potentially Built was implemented. An example of how the thresholdbased
classification of SVVI was applied to classify Secondary Forest is
shown in Fig. 7. While classifying 2010 Secondary Forest, we found
that SLC-off effects lowered SVVI MVC values in some areas near scene
edges, and caused areas classified as Agriculture for 2000 to be classified
as Secondary Forest for 2010. Because this was found to be a SLC-off artifact
and because transition fromAgriculture to Secondary Forest is unlikely,
we established a rule set using the 2000 and 2010 Secondary
Forest threshold-based classifications where “from” Secondary Forest
(2000) “to” non-Secondary Forest (2010) indicated Agriculture in
2010, from Secondary Forest to Secondary Forest indicated Secondary
Forest in 2010, and from non-Secondary Forest to Secondary Forest resulted
in the class mapped for 2000 being carried through to the 2010
map. These rules were applied at the stage of Secondary Forest assignment
in the discrete decision rule classification process.