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.
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.
- The present aerial photographs are being published on the Internet under “GSI Maps”. (Japanese only)
- Attachment 1 Orthophotographs of Nishinoshima Island 【PDF 208KB】
- Attachment 2-1 Comparison of the previously taken aerial photographs 【PDF 188KB】
- Attachment 2-2 Comparison of measurement results 【PDF 19KB】
- Attachment 3 Elevation change from March 1st, 2015 to July 28th, 2015 【PDF 222KB】
- Attachment 4 Oblique photographs (released as simplified video) 【PDF 128KB】
- Attachment 5 3D images of the area around Nishinoshima Island 【PDF 173KB】
- Attachment 6-1 Nishinoshima Island topographic interpretation map 【PDF 289KB】
- Attachment 6-2 New land formation/expansion due to eruption in the sea around Nishinoshima Island (8th report) 【PDF 75KB】