Abstract
Abstract. Nishinoshima volcano in Ogasawara Islands has erupted since November, 2013. This volcanic eruption formed and enlarged a new island, and fused the new island with the old Nishinoshima Island. We performed automated aerial photographing using an Unmanned Aerial Vehicle (UAV) over the joined Nishinoshima Island on March 22 and July 4, 2014. We produced ortho-mosaic photos and digital elevation model (DEM) data by new photogrammetry software with computer vision technique, i.e. Structure from Motion (SfM) for estimating the photographic position of the camera and Multi-view Stereo (MVS) for generating the 3-D model. We also estimated the area and volume of the new island via analysis of ortho-mosaic photo and DEM data. Transition of volume estimated from the UAV photographing and other photographing shows the volcanic activity still keeps from initial level. The ortho-mosaic photos and DEM data were utilized to create an aerial photo interpretation map and a 3-D map. These operations revealed new knowledge and problems to be solved on the photographing and analysis using UAV and new techniques as this was first case in some respects.
Highlights
Unmanned Aerial Vehicle (UAV) system is recently applied in many fields, e.g. disaster, environment, agriculture and archaeological investigation, observation of man-made objects such as bridge and dam site, acquisition of spatial information in local area and zone where a man is hard to enter (e.g. Yan et al, 2003; Bendea et al, 2008; Watabe and Sassa, 2009; Maza et al, 2011; Rinaudo et al, 2012; Inoue et al, 2014)
The ground control points (GCPs) were acquired at previous Nishinoshima Island using digital elevation model (DEM) data and ortho-mosaic photos, which were produced by traditional photogrammetry using a manned aerial vehicle and a photogrammetric camera on December 17, 2013
3-D map created from ortho-mosaic photo and DEM data (Figure 8) was released on web site (Geospatial Information Authority of Japan, 2014c)
Summary
Unmanned Aerial Vehicle (UAV) system is recently applied in many fields, e.g. disaster, environment, agriculture and archaeological investigation, observation of man-made objects such as bridge and dam site, acquisition of spatial information in local area and zone where a man is hard to enter (e.g. Yan et al, 2003; Bendea et al, 2008; Watabe and Sassa, 2009; Maza et al, 2011; Rinaudo et al, 2012; Inoue et al, 2014). The bundle adjustment algorithm automatically detect interior and exterior orientations for large unstructured collections of photographs and 3-D point clouds are reconstructed simultaneously (Snavely et al, 2006; Agarwal et al, 2009) Combination of this technique and UAV system is able to produce an ortho-mosaic photo and digital surface model (DSM) data conveniently from aerial photos Because the eruption with lava outflow continue, it is impossible to make a landing and ground observation at the present time We performed automated aerial photographing using a UAV on March 22 and July 4, 2014, and produced ortho-mosaic photos and DEM data using new photogrammetry software with SfM-MVS technique. Courses and 5 east-west courses (both 700 m) on July 4 above Nishinoshima Volcano
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