Geospatial Information Authority of Japan (GSI) took aerial photographs of the area around Nishinoshima Island on July 28th using its Unmanned Aerial Vehicle (UAV). GSI measured area, highest elevation and volume, and these results are publicly available now.
These photographs were taken by its Unmanned Aerial Vehicle (UAV) launched from Chichijima Island, Ogasawara Village, Tokyo, with the cooperation of the Ministry of Defense. The area around Nishinoshima Island had previously been photographed on March 1st by means of UAV
Through the analysis of aerial photographs and orthophotographs taken of the area around Nishinoshima Island, the following results were obtained.
The area was approximately 2.74 square kilometers. This is approximately 1.1 times as large as the area of 2.55 square kilometers measured on March 1st.
The elevation of highest point was approximately 150 meters (unofficial value). This is approximately 13 meters higher than that of 137 meters (unofficial value) measured on March 1st.
The total volume of lava over the sea level emitted and accumulated after the first eruption in November 2013 was approximately 85,110,000 cubic meters. This represented an increase of approximately 1.3 times the volume of 64,460,000 cubic meters obtained on March 1st.