Pinastereo-estimation de la hauteur dominante et de la biomasse forestiere dans le massif des Landes de Gascogne a partir d'images stereoscopiques Pleiades

Abstract

The maritime pine stands of 'Landes de Gascogne' forest is the object of a dynamic silviculture; Martin (1999) and Klaus (2009) windstorms have provoked a lot of damages and a great decrease of the resource. A permanent monitoring of the resource and its mapping has been reinforced. In this context, the study Pinastéréo explore some perspectives by testing a digital photogrammetry technique. Digital surface model and canopy height model have been realized by images Pleiades matching and by using the digital terrain model BD Alti®. Thanks to reference measures (aerial LiDAR, field plot measurements), the accuracy of DSM and CHM have been estimated. The top height of the coniferous stands, their aboveground volume and biomass were calibrated from extracted variables of CHM and then top height has been mapped for a specific zone. The satisfying accuracy of the models of the top height and of the aboveground volume of the coniferous stands is promising. A generalization all over the 'Landes de Gascogne' forest and a use for others coniferous even-aged stands is now allowed.