【出典】 国土地理院 「The bathymetric contours are derived from those contained within the GEBCO Digital Atlas, published by the BODC on behalf of IOC and IHO (2003) (http://www.gebco.net) 海上保安庁許可第292502号(水路業務法第25条に基づく類似刊行物)」 Shoreline data is derived from: United States. National Imagery and Mapping Agency. \"Vector Map Level 0 (VMAP0).\" Bethesda, MD: Denver, CO: The Agency; USGS Information Services, 1997. 「データソース:Landsat8画像(GSI,TSIC,GEO Grid/AIST), Landsat8画像(courtesy of the U.S. Geological Survey), 海底地形(GEBCO)」 Images on 世界衛星モザイク画像 obtained from site https://lpdaac.usgs.gov/data_access maintained by the NASA Land Processes Distributed Active Archive Center (LP DAAC), USGS/Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota, (Year). Source of image data product.