7th Workshop on Forest Fire Management - EARSeL, European ...

130
II - VALIDATION OF RS PRODUCTS FOR FIRE MANAGEMENT
Figure 1 - Inter-annual variability of burnt area respecting to annual values (thick line) and
summer (i.e. July + August) values (thin line) over Portugal, during 1982-2006.
Figure 2 - Scatter plot of NDVI in May vs. DSR in summer over forested areas in Portugal for
the period 1982-2006 (left panel); summer amounts of burned areas in Portugal sorted in
descending order (right panel) during the same period. Dotted lines (left panel) indicate cut
points as obtained from regression tree analysis (see Figure 3). Symbols (both panels) identify
the different classes of fire activity according to the different fitted response values of the
regression tree model (see Figure 3); black inverted triangles weak activity [log(BA)=3.74];
grey circles moderately low activity [log(BA)=4.70]; black circles moderately high activity
[log(BA)=4.86]; grey triangles high activity [log(BA)=5.24]; black triangles extremely
high activity [log(BA)=5.56].