Japanese Geodetic Datum 2011 (JGD2011)
Japanese origin of longitude and latitude
( 2-18-1 Azabudai, Minato-ku, Tokyo )
Longitude and latitude are means to express an exact positions on the globe. This is the very origin of all the surveys conducted in Japan . Longitude: 139° 44' 28.8869" (East) Latitude: 35° 39' 29.1572" (North)
Japanese datum of leveling
(1-1 Nagata-cho, Chiyoda-ku, Tokyo )
Elevations of Japan are determined with reference to the mean sea level of Tokyo Bay (elevation 0 m). The reading of 0 on the crystal scale embedded in the stone base monument of the datum indicates 24.3900m above the mean sea level of Tokyo Bay .
Triangulation point
Benchmark
GNSS Earth Observation Network System (GEONET)
Continuously Operating
Reference Station (CORS)
For more detail
- Outline of the New Japanese Geodetic System (Bulletin of GSI, Vol.51, March 2004)
Geomagnetic Survey(under maintenance)
- VLBI (Very Long Baseline Interferometry)
- InSAR(Interferometric Synthetic Aperture Radar)
- Tide Observation
- GEONET(GNSS Earth Observation Network System)
- Crustal Movement in Japan
- The Coordinating Committee for Earthquake Prediction