JGEOID2024 is an improved gravimetric geoid model for Japan, developed by the Geospatial Information Authority of Japan.
It covers the region from 15° to 50° and 120° to 160° with a grid spacing of 1 x 1.5 arc minutes. The geoid heights
are referenced to the GRS80 ellipsoid, with a W0 value of 62,636,853.4 m2/s2. The model has been computed using the GOCE-based
global geopotential model GOCONS_GCF2_TIM_R6, surface gravity data (land and ship-borne), airborne gravity data, and the SIO V32.1
altimetry-derived marine gravity model. The geoid computation methodology is based on Helmert's second condensation method with
Helmert gravity anomalies (i.e., UNB Stokes-Helmert method). The remove–compute–restore technique was applied with the
hybrid Meissl–Molodensky modified spheroidal Stokes kernel (i.e., the FEO kernel). Intercomparison with GNSS/leveling data from
Geoid Slope Validation Surveys conducted in 2022–2023 indicates that JGEOID2024 has an accuracy of approximately 3 cm.
Key word
Gravimetric geoid model, International Height Reference System
Geolocation
Japan and its surroundings (lat. 20° to 50° and lon. 120° to 150°)
Correspondence
Space Geodesy Research Division (mail: gsi-space-geodesy+3=gxb.mlit.go.jp) (Replace = to @)