期刊
REMOTE SENSING
卷 14, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/rs14184559
关键词
coastal wetland; restoration; Worldview-2; object-based image analysis; change detection; multi-temporal
类别
资金
- Unitywater
Coastal wetlands are important for regenerating lost ecosystem services. This study utilized remote sensing techniques and classification methods to accurately measure the changes in a restoring coastal wetland in eastern Australia. The results demonstrated the effectiveness of this approach in accurately quantifying the early responses of coastal wetlands to restoration.
Coastal wetlands are restored to regenerate lost ecosystem services. Accurate and frequent representations of the distribution and area of coastal wetland communities are critical for evaluating restoration success. Typically, such data are acquired through laborious, intensive and expensive field surveys or traditional remote sensing methods that can be erroneous. Recent advances in remote sensing techniques such as high-resolution sensors (<2 m resolution), object-based image analysis and shallow learning classifiers provide promising alternatives but have rarely been applied in a restoration context. We measured the changes to wetland communities at a 200 ha restoring coastal wetland in eastern Australia, using remotely sensed Worldview-2 imagery, object-based image analysis and random forest classification. Our approach used structural rasters (digital elevation and canopy height models) and a multi-temporal technique to distinguish between spectrally similar land cover. The accuracy of our land cover maps was high, with overall accuracies ranging between 91 and 95%, and this supported early detection of increases in the area of key ecosystems, including mixed she-oak and paperbark (10 ha), mangroves (0.91 ha) and saltmarsh (4.31 ha), over a 5-year monitoring period. Our approach provides coastal managers with an accurate and frequent method for quantifying early responses of coastal wetlands to restoration, which is essential for informing adaptive management in the regeneration of ecosystem services.
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