[HTT19-P03] Applications of Stereoscopic viewer for the Seamless Geographical Information System and its Prospect
Keywords:Stereo vision, HTML, Crossing method, rotating body, topographic map, Geological map
Stereoscopic Viewer (Ryoki,2019a), that displays the GSI Globe (Geospatial Information Authority of Japan,2017), facilitates understanding of geological information appearing in topographic maps and aerial photographs.This viewer displays a single image of a rotating object. It can display 3D images of mineral crystal structures, molecular models, civil engineering structures, etc. (Ryoki,2019b). Therefore, it is expected to be used in education or vocational development (Ryoki,2019c). It is described that An example of using the seamless geological map (Geological Survey of Japan,2019) or images shot from drones, etc. in this paper.
2.Overview of the stereoscopic viewer
3.Stereoscopic viewing of geological information
When viewing long active faults expressed in GSI Globe, it is not possible continuously to watch stereoscopic viewing in a range beyond the PC monitor. This is because there are restrictions due to security issues in HTML describing Stereoscopic Viewer. In such a case, the following procedure is possible. First, display only a map of GSI Globe on some browser and move it horizontally with the mouse. At this time, the mouse can be moved to the full width of the monitor regardless of the browser. This window is recorded by a captor application and saved as a very long video file in the horizontal direction. And when this file is browsed with Stereoscopic Viewer, it is able to view seamlessly all of the saved sections in stereoscopic viewing. The same treatment can be used when displaying seamless geological maps.
4.Stereoscopic viewing of moving image
When the video taken from a drone horizontally or rotate, it can be viewed stereoscopically. Even when the video moves vertically, it can be viewed stereoscopically if it is converted horizontally by some video processing application (Fig.2). The animation tool "Google Earth Studio" can created a video file of geographic information image (Google LLC,2020). The file can be viewed with Stereoscopic Viewer. This is suitable not only for horizontal and vertical shooting but also for bird's-eye view or looking-up view.
In GSI Globe, the map tiles are read from the GSI server each time when they are browsed. For this reason, it cannot be viewed in out of communication area. Therefore, it is planed to improve Stereoscopic Viewer so that the tiles of the required area are downloaded in advance.
Geological Survey of Japan(2019): Seamless Digital Geological Map of Japan 1:200,000, AIST, https://gbank.gsj.jp/seamless/
Geospatial Information Authority of Japan(2017): Official release of GSI Map Globe, http://www.gsi.go.jp/common/000185126.pdf
Google LLC(2020): Introduction,Google Earth Stadio, https://earth.google.com/studio/docs/ja/
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Watanabe,K.(2019): Drone recording in PTU (unpublished).