Outlines › European wetland mapping, disturbance and restoration › Abstract and study scope › European-scale mapping and fragmentation

European-scale mapping and fragmentation

Source: Highly fragmented European wetlands with uneven restoration needs · section · created seq 22645

We mapped six natural and seminatural open wetland types across large parts of Europe at 10-m resolution

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The researchers mapped six natural and seminatural open wetland types across large parts of Europe at 10-m resolution, with overall accuracy of 96.6 ± 0.3%, covering an estimated 413,504 ± 17,782 square kilometres, or 6.8 ± 0.3% of the respective land surface. They used an XGBoost machine-learning algorithm trained on 101,000 CORINE Land Cover-labelled sample points and applied it to a multisensor satellite data cube spanning 2017–2019. The predictor set combined optical and radar observations from more than 470,000 Sentinel-1 and Sentinel-2 scenes with auxiliary layers on topography, climate, biomes and soil. An independent validation sample and design-based area estimates were used. European wetlands were fine-grained and highly fragmented: 27–33% of wetland area occurred in map-defined patches smaller than 25 hectares and 7–11% in patches smaller than 1 hectare. Small-patch prevalence was greatest for inland marshes, with 48.8% below 25 hectares and 19.8% below 1 hectare, while intertidal flats had the lowest shares. Coarser inventories commonly miss wetlands below 25 hectares and below 1 hectare.

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