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Keith Peterson [11-2013]:

Monitoring Mangrove Reforestation with TerraSAR-X in Senegal

Diese Arbeit ist online verfügbar: Download

This study examined to what extent a TerraSAR-X based monitoring mechanism can efficiently supplement traditional field-measurement based monitoring plans for the continuous monitoring of young mangrove plantation environments. For this purpose, a study site in southwestern Senegal, along the Casamance River, was examined. Mangrove forests are fragile and sensitive ecosystems that play an important role in the lifecycles of numerous species, provide natural resources to human populations and protect coastal areas from the impacts of climate change. Unfortunately, these forests are threatened worldwide and declining at an alarming rate. In order to prevent this valuable ecosystem from completely disappearing, large scale reforestation efforts have been started. The Livelihoods Fund initiated a mangrove reforestation project in 2008 within the framework of a Clean Development Mechanism. To successfully track the progress of their investment, an efficient monitoring program is required. TerraSAR-X StripMap scenes were acquired over the study area to temporally coincide with a field campaign in late 2012. A statistical inversion model was derived from the data to allow for an object-based stratification of growth quality within the plantations. The resulting image classification, performed on two separate TS-X footprints, yielded a cumulative overall accuracy of 77% and a Kappa of 75%. In addition, the methodology could be applied to just over 70% of the study area. The results of this study are, at this time, limited mostly by the extreme fluctuations in water depth caused by tidal conditions and the complex hydrology of the estuary. These unknown variables particularly impact the growth quality strata. Nevertheless, the study provides an excellent foundation for future research and demonstrates that a TerraSAR-X based monitoring system can be utilized to gain valuable wall-to-wall information on the state of mangrove reforestation efforts.

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