4.2. Interpretation of land covers maps
This means that over 90% of the pixels of the images have been properly classified to ground-truth data. The typology thus defined consists of nine classes:
Reading statistics classes from 1987 to 2018 showed that the forest landscape of our study area has changed significantly (Figure 4). Note that the forest formations have experienced changes in their percentages between the periods of observations. The percentage of pine forest is (11% or 1853.9 ha) for the years 1987 and 1992. We note that a decline of this class up to (7% or 1129.0 ha), (7% or 1156.4 ha) and (5% is 831.8 ha) respectively for 2002, 2007 and 2010. But this forest grew again in 2013 and 2018. The maquis of pine also recorded an increase in 2010 and 2018.
Figure 4: Maps of the evolution of forest species of the 1987 to 2018 of study area
The percentages for the work of reforestation and the olive trees have recorded extremely low values. Annual crops are an important area of the study area, for this class high percentages were noted.