GSI HOME > Update history > Aerial photographs taken around Nishinoshima Island. Last Updated : April 30, 2015

Aerial photographs taken around Nishinoshima Island.

Outline

Geospatial Information Authority of Japan (GSI) took aerial photographs of the area around Nishinoshima Island on March 1st by its Unmanned Aerial Vehicle (UAV) launched from Chichijima Island, Ogasawara Village, Tokyo. GSI measured area, highest elevation and volume and these results are publicly available.

Details

 These photographs were taken on March 1st with the cooperation of the Ministry of Defense, and area around Nishinoshima Island had previously been taken on December 4th and 10th by means of GSI’s survey aerial vehicle “Kunikaze III”.
 
  Through the analysis of aerial photographs taken of the area around Nishinoshima Island (Attachment 1), the following results were obtained (Attachment 2).
  •  The area was approximately 2.55 square kilometers. This is approximately 1.1 times as large as the area of 2.27 square kilometers measured on December 4th.
  •  The elevation of highest point was approximately 137 meters (reference value). The highest elevation on December 4th was approximately 110 meters (reference value).
  •  The volume of lava over the sea level emitted and accumulated after the first eruption in November 2013 was approximately 64,460,000 cubic meters. This represented an increase of approximately 1.3 times the volume of 49,700,000 cubic meters confirmed on December 4th, last year.
  The present aerial photographs are being published on the Internet under “GSI Maps”. Furthermore, a map showing elevation change from December 4th (Attachment 3), simplified video successively displaying oblique photographs (Attachment 4), 3D images of the area around Nishinoshima Island (Attachment 5), topographic interpretation maps (Attachment 6-1 and Attachment 6-2), and elevation data are also published.

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