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Volume 59 (2013)
- Issue 4 Pages 133-
- Issue 3 Pages 63-
- Issue 2 Pages 25-
- Issue 1 Pages 1-
Volume 59, Issue 3
Displaying 1-7 of 7 articles from this issue
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SPECIAL ISSUE ON GEODESY OF JAPAN WITH A GLOBAL PERSPECTIVE
REVIEW PAPER
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Koji Matsumoto2013 Volume 59 Issue 3 Pages 63-70
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSThe first result in Japanese planetary geodesy was brought by the asteroid mission Hayabusa which estimated the bulk density of the asteroid Itokawa through the measurements of gravity and shape. The Japanese lunar mission SELENE was also successful in terms of geodetic research to achieve developing improved models of the lunar topography and gravity. I review the international circumstance around the time of SELENE, the framework of SELENE geodetic mission operation, and the scientific outcomes from SELENE geodetic mission instruments. I point out the current difficulties in promoting future missions and propose possible approach to solve the problems.View full abstractDownload PDF (444K) -
Shinobu Kurihara2013 Volume 59 Issue 3 Pages 71-78
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSThe development of the Very Long Baseline Interferometry as a space geodetic technique started in the 1960’s. The R&D institutes in the United States and Japan developed several practical geodetic VLBI systems, and have been upgrading them with the advancement of technology. The VLBI operations, for instance, observation, data processing, and analysis had been implemented by some regional communities such as the Japan-US Joint Experiment and the Geodetic VLBI Community in Europe. Since the International VLBI Service for Geodesy and Astrometry (IVS) was established in 1999, the operations have been conducted under a global framework. This report reviews the history of VLBI development, looks over the status of the present VLBI operations of IVS to study how the countries in the world contribute to IVS, and gives an outline of the future VLBI concept (VLBI2010). Furthermore, an issue into the geodetic VLBI community in Japan is raised.View full abstractDownload PDF (843K) -
Toshimichi Otsubo, Shinichi Nakamura, Mariko Sato, Hiroo Kunimori2013 Volume 59 Issue 3 Pages 79-86
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSGeodetic laser ranging activities in Japan are reviewed in comparison with the worldwide perspective, in terms of terrestrial tracking stations, satellite missions and scientific analyses. Being severely understaffed, three laser ranging stations, three associate analysis centers, and a number of satellite missions have been successfully operated, and a number of significant contributions have been made to the international community in both science and technology. In the future, we should strive to focus more on domestically-produced technologies, educational paths, and multiple-technique integration.View full abstractDownload PDF (523K) -
— From the View Point of the Japanese University Consortium for GPS Research (JUNCO) —Teruyuki Kato2013 Volume 59 Issue 3 Pages 87-97
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSProgress of GPS application to crustal deformation researches has been reviewed from the stand point of “Japanese University Consortium for GPS Research” (JUNCO). JUNCO was established in 1987 when a lot of dual frequency GPS receivers were introduced abruptly under the national projects of earthquake prediction and volcanic eruption prediction. The consortium aimed to exchange information on GPS research and to promote joint observational researches in Japan. Thus, a number of cooperative observational studies have been conducted under the name of JUNCO since its establishment. Such studies include not only domestic nationwide and local dense array campaign observations but also international projects in Asian and Pacific regions. Later, as the Geographical Survey Institute (now, Geospatial Information Authority of Japan) established the nationwide GPS observation network (GEONET), edge cutting researches have been made using GEONET data. The GPS technology is now becoming a fully-fledged technology. Due to the developments of other satellite navigation systems other than GPS, these systems are collectively called as Global Navigation Satellite System (GNSS). Given this new trend of technology, we may have to seek for a new trend of applications of the technology. Some possible innovative applications to earth science are discussed.View full abstractDownload PDF (735K) -
Motoyuki Kido2013 Volume 59 Issue 3 Pages 99-109
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSSeafloor geodetic measurements are now recognized as crucial tools to effectively monitor the crustal stress accumulation, especially after the Tohoku Earthquake 2011. The situation promotes the Japanese government to invest in facility of these tools to prepare for devastating disaster. Considering the rapid growth in this field, researchers must manage the tools as sustainable manner both in financial and human costs in order to maximize the efficiency for long-lasting operation. In this paper, current state of the seafloor geodesy and problems arose due to the drastic turn after the earthquake are addressed, then advocate how we should act toward the new era.View full abstractDownload PDF (853K) -
Hiroshi Munekane2013 Volume 59 Issue 3 Pages 111-118
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSThe successful gravity mission GRACE is reviewed from a perspective of an end user. It is observed that the high-quality, easy-to-use solutions that have been continually provided by the analysis centers contributed to the widespread use of the GRACE data, especially among non-specialists, which resulted in vast amount of fruitful scientific findings by the mission. The author feels a successful analysis center, that is able to provide high-quality data, needs a team that includes both the specialists of the raw data analysis and those of data evaluation/interpretation (and those who know both, of course). Such a team will also be critical for the success of a future Japanese mission.View full abstractDownload PDF (2457K) -
Manabu Hashimoto, Masato Furuya, Taku Ozawa, Yo Fukushima2013 Volume 59 Issue 3 Pages 119-132
Published: 2013
Released on J-STAGE: July 11, 2015
JOURNAL OPEN ACCESSSynthetic aperture radar (SAR) has been widely used in crustal deformation studies all over the world. Especially the Japanese Advanced Land Observing Satellite (ALOS) contributed so much to the studies of large earthquakes, volcanic eruptions, landslides and other phenomena, and Japanese researchers presented many remarkable results in international journals and conferences. Studies with SAR, however, depend on the environment including satellites, software, data distribution etc. International research community is taking a step forward earlier than the Japanese community, by establishing research alliances between several disciplines. New techniques are frequently proposed and discussed in several international meetings. Data and software are widely and freely distributed in the international research community. Although the ALOS-2 will be launched in the near future and Japanese researchers may have privileges on the access to data, it is important to discuss the strategy that do not heavily depend on ALOS-2. Collaboration among researchers in related fields of SAR technologies and earth sciences is indispensable to achieve the international competition in research. It is also important for Japanese researchers to present the potential and attractiveness of SAR studies to young students.View full abstractDownload PDF (4179K)
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