Japan Geoscience Union Meeting 2021

Presentation information

Print

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG41] Coastal Ecosystems -2. Coral reefs, seagrass and macroalgal beds, and mangroves

Thu. Jun 3, 2021 10:45 AM - 12:15 PM Ch.10 (Zoom Room 10)

convener:Yu Umezawa(Tokyo University of Agriculture and Technology), Toshihiro Miyajima(Marine Biogeochemistry Group, Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, The University of Tokyo), Atsushi Watanabe(The ocean policy research institute, The Sasakawa peace foundation), Tomihiko Higuchi(Atmosphere and Ocean Research Institute, The University of Tokyo), Chairperson:Yu Umezawa(Tokyo University of Agriculture and Technology), Toshihiro Miyajima(Marine Biogeochemistry Group, Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, The University of Tokyo), Atsushi Watanabe(The ocean policy research institute, The Sasakawa peace foundation), Tomihiko Higuchi(Atmosphere and Ocean Research Institute, The University of Tokyo)

11:30 AM - 11:45 AM

[ACG41-04] Detection of seagrass habitat in Himi, Toyama Bay using Google Earth Engine

*Genki Terauchi1, Eligio de Raus Maure1, Yasuyuki Harada1, Wataru Matsumura2, Tsuneo Maeda3 (1.Northwest Pacific Region Environmental Cooperation Center, 2.Fisheries Research Institute, Toyama Prefectural Agricultural Forestry and Fisheries Research Center, 3.Toyama Prefectural Fisheries and Fishing Ports Division)

Keywords:seagrass, Google Earth Engine, Mapping

Extent of seagrass habitat was mapped in coastal zone of Himi area in Toyama Bay using Seagrass Mapper, a web-based tool for mapping coastal habitats built upon Google Earth Engine (GEE). Results of field survey of sea floor conducted by an underwater video camera in June in 2018 were used to train satellite image of July 15, 2018 taken by Worldview-110 camera on board Worldview 2 satellite for its segmentation. The areas of seagrass beds in Himi were then estimated by the random forest supervised classification method. The estimated area of seagrass habitat was then compared with the report from the Fisheries Research Institute of Toyama Prefectural Agricultural Forestry and Fisheries Research Center published 2011. The study shows that removal of effects of water column by the Bottom Reflectance Index method better estimates area of seagrass habitats especially in deeper water.