High-Resolution Classification of South Patagonian Peat Bog Microforms Reveals Potential Gaps in Up-Scaled CH4 Fluxes by use of Unmanned Aerial System (UAS) and CIR Imagery
| Autor: | Lehmann, Jan R. K., Münchberger, Wiebke, Knoth, Christian, Blodau, Christian, Nieberding, Felix, Prinz, Torsten, Pancotto, Veronica Andrea, Kleinebecker, Till |
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| Přispěvatelé: | Universitäts- und Landesbibliothek Münster |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
RPAS
CLOSED CHAMBER UAV Ecología closed chamber object-based image analysis OBIA classification methane peatland Ciencias Biológicas purl.org/becyt/ford/1 [https] Earth sciences METHANE OBIA CLASSIFICATION PEATLAND ddc:550 OBJECT-BASED IMAGE ANALYSIS purl.org/becyt/ford/1.6 [https] CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | South Patagonian peat bogs are little studied sources of methane (CH4). Since CH4 fluxes can vary greatly on a small scale of meters, high-quality maps are needed to accurately quantify CH4 fluxes from bogs. We used high-resolution color infrared (CIR) images captured by an Unmanned Aerial System (UAS) to investigate potential uncertainties in total ecosystem CH4 fluxes introduced by the classification of the surface area. An object-based approach was used to classify vegetation both on species and microform level. We achieved an overall Kappa Index of Agreement (KIA) of 0.90 for the species- and 0.83 for the microform-level classification, respectively. CH4 fluxes were determined by closed chamber measurements on four predominant microforms of the studied bog. Both classification approaches were employed to up-scale CH4 closed chamber measurements in a total area of around 1.8 hectares. Including proportions of the surface area where no chamber measurements were conducted, we estimated a potential uncertainty in ecosystem CH4 fluxes introduced by the classification of the surface area. This potential uncertainty ranged from 14.2 mg·m-2· day-1 to 26.8 mg·m-2· day-1. Our results show that a simple classification with only few classes potentially leads to pronounced bias in total ecosystem CH4 fluxes when plot-scale fluxes are up-scaled. Fil: Lehmann, Jan R. K.. Westfalische Wilhelms Universitat; Alemania Fil: Münchberger, Wiebke. Westfalische Wilhelms Universitat; Alemania Fil: Knoth, Christian. Westfalische Wilhelms Universitat; Alemania Fil: Blodau, Christian. Westfalische Wilhelms Universitat; Alemania Fil: Nieberding, Felix. Westfalische Wilhelms Universitat; Alemania Fil: Prinz, Torsten. Westfalische Wilhelms Universitat; Alemania Fil: Pancotto, Veronica Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Kleinebecker, Till. Westfalische Wilhelms Universitat; Alemania |
| Databáze: | OpenAIRE |
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