Driven by Drones: Improving Mangrove Extent Maps Using High-Resolution Remote Sensing
| Autor: | Astrid J Hsu, John Dorian, Fabio Favoretto, Benigno Guerrero Martinez, Joy A. Kumagai, Octavio Aburto-Oropeza |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Geographic information system
010504 meteorology & atmospheric sciences Science 0211 other engineering and technologies High resolution 02 engineering and technology 01 natural sciences convolution Leverage (statistics) international commitments 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing geographic information systems Pixel business.industry Drone monitoring Remote sensing (archaeology) unmanned aerial vehicles area correction General Earth and Planetary Sciences Environmental science Satellite Mangrove business |
| Zdroj: | Remote Sensing; Volume 12; Issue 23; Pages: 3986 Remote Sensing, Vol 12, Iss 3986, p 3986 (2020) |
| ISSN: | 2072-4292 |
| DOI: | 10.3390/rs12233986 |
| Popis: | This study investigated how different remote sensing techniques can be combined to accurately monitor mangroves. In this paper, we present a framework to use drone imagery to calculate correction factors which can improve the accuracy of satellite-based mangrove extent. We focus on semi-arid dwarf mangroves of Baja California Sur, Mexico, where the mangroves tend to be stunted in height and found in small patches, as well as larger forests. Using a DJI Phantom 4 Pro, we imaged mangroves and labeled the extent by manual classification in QGIS. Using ArcGIS, we compared satellite-based mangrove extent maps from Global Mangrove Watch (GMW) in 2016 and Mexico’s national government agency (National Commission for the Knowledge and Use of Biodiversity, CONABIO) in 2015, with extent maps generated from in situ drone studies in 2018 and 2019. We found that satellite-based extent maps generally overestimated mangrove coverage compared to that of drone-based maps. To correct this overestimation, we developed a method to derive correction factors for GMW mangrove extent. These correction factors correspond to specific pixel patterns generated from a convolution analysis and mangrove coverage defined from drone imagery. We validated our model by using repeated k-fold cross-validation, producing an accuracy of 98.3% ± 2.1%. Overall, drones and satellites are complementary tools, and the rise of machine learning can help stakeholders further leverage the strengths of the two tools, to better monitor mangroves for local, national, and international management. |
| Databáze: | OpenAIRE |
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