Mapping Floods in Lowland Forest Using Sentinel-1 and Sentinel-2 Data and an Object-Based Approach
| Autor: | Damir Klobučar, Mateo Gašparović |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Synthetic aperture radar
Geospatial analysis 010504 meteorology & atmospheric sciences Floodplain 0211 other engineering and technologies 02 engineering and technology computer.software_genre 01 natural sciences remote sensing QK900-989 rapid mapping floods forests machine learning Sentinel-1 Sentinel-2 image classification object-based image analysis Plant ecology 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing geography Forest inventory Spectral signature geography.geographical_feature_category Data collection Flood myth Forestry Vegetation Environmental science computer |
| Zdroj: | Forests Volume 12 Issue 5 Forests, Vol 12, Iss 553, p 553 (2021) |
| ISSN: | 1999-4907 |
| DOI: | 10.3390/f12050553 |
| Popis: | The impact of floods on forests is immediate, so it is necessary to quickly define the boundaries of flooded areas. Determining the extent of flooding in situ has shortcomings due to the possible limited spatial and temporal resolutions of data and the cost of data collection. Therefore, this research focused on flood mapping using geospatial data and remote sensing. The research area is located in the central part of the Republic of Croatia, an environmentally diverse area of lowland forests of the Sava River and its tributaries. Flood mapping was performed by merging Sentinel-1 (S1) and Sentinel-2 (S2) mission data and applying object-based image analysis (OBIA). For this purpose, synthetic aperture radar (SAR) data (GRD processing level) were primarily used during the flood period due to the possibility of all-day imaging in all weather conditions and flood detection under the density of canopy. The pre-flood S2 imagery, a summer acquisition, was used as a source of additional spectral data. Geographical information system (GIS) layers—a multisource forest inventory, habitat map, and flood hazard map—were used as additional sources of information in assessing the accuracy of and interpreting the obtained results. The spectral signature, geometric and textural features, and vegetation indices were applied in the OBIA process. The result of the work was a developed methodological framework with a high accuracy and speed of production. The overall accuracy of the classification is 94.94%. Based on the conducted research, the usefulness of the C band of the S1 in flood mapping in lowland forests in the leaf-off season was determined. The paper presents previous research and describes the SAR parameters and characteristics of floodplain forest with a significant impact on the accuracy of classification. |
| Databáze: | OpenAIRE |
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