Contribution to study the state of vegetation cover of some forests in the region of Djelfa with vegetation index by using GEE

Abstract

Contribution to study the state of vegetation cover of some forests in the region of Djelfa with vegetation index and using GEE. This work studies the state of the vegetation cover of the Senalba forest massif, located in the Djelfa region. The main objective was to assess and analyze its cover over a specific period (2015– 2025), by utilizing satellite data available on the Google Earth Engine (GEE) platform and applying the NDVI and SAVI vegetation indices. The results highlight a significant variability in vegetation cover density, influenced by both ecological factors and persistent anthropogenic pressures. Some areas show signs of regeneration, while others reveal concerning degradation that could compromise the ecological balance and the sustainability of forest resources. The comparative analysis of NDVI and SAVI confirmed the importance of combining these two indices in semi-arid ecosystems to obtain a more reliable assessment of vegetation cover, particularly in areas where bare soil is highly exposed.