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

Cyberpark project: Multitemporal satellite data set for pre-operational fire susceptibility monitoring and post-fire recovery estimation 97
Figure 2 - Danger map obtained for February, May, July, and October 2007.
2.2 - Post-fire vegetation recovery assessment
The assessment of vegetation fire recovery is performed using satellite time
series. MODIS Normalized Difference Vegetation Index (NDVI) from 2001 to
2007 was used to examine the recovery characteristics of fire affected vegetation
at different temporal and spatial scales. In order to eliminate the
phenological fluctuations, for each decadal composition, we focused on the
normalized departure NDVIdn = (NDVI-NDVIm)/σndvi where NDVIm is the
decadal mean and σndvi is the decadal standard deviation see figure 3. The
decadal and the standard deviation are calculated for each decade, e.g.,
first decade of January, by averaging over all years in the record. We analyzed
both: (1) Post-disturbance NDVI spatial patterns on each image date
were compared to the pre-disturbance pattern to determine the extent to
which the pre-disturbance pattern was re-established, and the rate of this
recovery. (2) time variation of NDVI for pixels fire-affected and fire-unaffected
areas (Tuia et al., 2008).