Automatic monitoring; Change detection; Sentinel-1; Sentinel-2; Time series; Urban planning; Global and Planetary Change; Ecology; Nature and Landscape Conservation
Abstract :
[en] Urban planning is a challenge, especially when it comes to limiting land take. In former industrial regions such as Wallonia, the presence of a large number of brownfields, here called “redevelopment sites”, opens up new opportunities for sustainable urban planning through their revalorization. The Walloon authorities are currently managing an inventory of more than 2200 sites, which requires a significant amount of time and resources to update. In this context, the Sentinel satellites and the Terrascope platform, the Sentinel Collaborative Ground Segment for Belgium, enabled us to deploy SARSAR, an Earth observation service used for the automated monitoring of redevelopment sites that generates regular and automatic change reports that are directly usable by the Walloon authorities. In this paper, we present the methodological aspects and implementation details of the service, which combines two well-known and robust methods: the Pruned Exact Linear Time method for change point detection and threshold-based classification, which assigns the detected changes to three different classes (vegetation, building and soil). The overall accuracy of the system is in the range of 70–90%, depending on the different methods and classes considered. Some remarks on the advantages and possible drawbacks of this approach are also provided.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Petit, Sophie; Remote Sensing and Geodata Unit, Institut Scientifique de Service Public (ISSeP), Liège, Belgium
Stasolla, Mattia; Signal and Image Centre, Royal Military Academy, Brussels, Belgium
Wyard, Coraline ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie ; Remote Sensing and Geodata Unit, Institut Scientifique de Service Public (ISSeP), Liège, Belgium
Swinnen, Gérard; Remote Sensing and Geodata Unit, Institut Scientifique de Service Public (ISSeP), Liège, Belgium
Neyt, Xavier; Signal and Image Centre, Royal Military Academy, Brussels, Belgium
Hallot, Eric ; Université de Liège - ULiège > Département de géographie ; Remote Sensing and Geodata Unit, Institut Scientifique de Service Public (ISSeP), Liège, Belgium
Language :
English
Title :
A New Earth Observation Service Based on Sentinel-1 and Sentinel-2 Time Series for the Monitoring of Redevelopment Sites in Wallonia, Belgium
BELSPO - Belgian Federal Science Policy Office [BE]
Funding text :
Funding: The research presented in this paper is funded by BELSPO (Belgian Science Policy Office) in the frame of the STEREO III programme—project SR/00/372.
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