In 2012 verloren we Jean Jacques Peters, voormalig ingenieur van het Waterbouwkundig Laboratorium (1964 tot 1979) en internationaal expert in sedimenttransport, rivierhydraulica en -morfologie. Als eerbetoon aan hem hebben we potamology (http://www.potamology.com/) gecreëerd, een virtueel gedenkarchief dat als doel heeft om zijn manier van denken en morfologische aanpak van rivierproblemen in de wereld in stand te houden en te verspreiden.
Het merendeel van z’n werk hebben we toegankelijk gemaakt via onderstaande zoekinterface.
Grasslands cover about one-third of the global ice-free land surface and deliver crucial ecosystem services. The state of grasslands and the balance between provisioning and regulating ecosystem services are largely determined by grassland use intensity. A better characterization of grassland production systems is essential to evolve toward more sustainable grassland management. Therefore, temporally and spatially explicit data on each aspect of grassland use intensity are crucial. The overarching objective of this thesis is to measure grassland use intensity over large areas thanks to satellite remote sensing. To that end, we developed and evaluated methods, based on Sentinel-1 and Sentinel-2 time series, (i) to classify grassland management practices (i.e. grazing and mowing), (ii) to delineate management units, (iii) to detect the timing and frequency of mowing events, and (iv) to estimate forage yield and quality. Each method was thoroughly evaluated in terms of robustness, versatility, and transferability, with particular attention to reference data quality and quantitative validation. Grasslands were characterized exhaustively and with high thematic precision compared to existing datasets. Overall, EO-based grassland use intensity measurement could contribute to large-scale agricultural and ecological monitoring.
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