By Urs Marti
This quantity incorporates a choice of papers offered on the IAG overseas symposium "Gravity, Geoid and top platforms 2012" (GGHS2012), which used to be equipped by means of IAG fee 2 “Gravity box” with the help of the overseas Gravity box carrier (IGFS) and GGOS topic 1 “Unified international peak System”. The publication summarizes the newest effects on gravimetry and gravity networks, international gravity box modeling and purposes, destiny gravity box missions. It presents a close compilation on advances in exact neighborhood and nearby high-resolution geoid modeling, the institution and unification of vertical reference structures, contributions to gravity box and mass shipping modeling in addition to articles at the gravity box of planetary bodies.
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Additional resources for Gravity, Geoid and Height Systems: Proceedings of the IAG Symposium GGHS2012, October 9-12, 2012, Venice, Italy
2011). In a recent publication (Baur et al. 2012) concerning GOCE-SST analysis we showed that the point-wise acceleration approach (i) performs comparable to the CMA, (ii) is superior to the EBA solution used for the GOCE-TIM (Pail et al. 2011) estimates, and (iii) is able to improve the GOCETIM solutions up to spherical harmonic degree and order 20–30. In Baur et al. (2012) we applied an extended differentiation filter (EDF(30s)) to the 1s-sampled kinematic GOCE orbit. The EDF(30s) acts as a low-pass filter; it damps noise and gravity signal on high frequencies but keeps gravity signal for spherical harmonic degrees l Ä 90 untouched.
An arc-length of 480 s seems optimal 24 T. Reubelt et al. −8 −8 10 ITG−GRACE2010s arc−length = 1440 arc−length = 720 arc−length = 480 arc−length = 360 EDF(30s), empirical covariances −9 10 ITG−GRACE2010s |i−j| degree−RMS (m > 5) degree−RMS (m > 5) 10 −10 10 0 40 60 80 Fig. 0 20 40 60 80 degree Fig. 5 Results from EDF(1s) using the arc-length D 480 (corresponding to 8 min) and maximum resolution Lmax D 120; different versions of VCMs are applied for data-weighting; dashed lines represent formal errors from Fig.
2012) we applied an extended differentiation filter (EDF(30s)) to the 1s-sampled kinematic GOCE orbit. The EDF(30s) acts as a low-pass filter; it damps noise and gravity signal on high frequencies but keeps gravity signal for spherical harmonic degrees l Ä 90 untouched. As far as stochastic modeling is concerned, in Baur et al. (2012) we used robust estimation in combination with data-weighting by means of empirical covariance functions estimated from residuals in the local frame. The quality of the solutions turned out to be largely independent of the arc-length (720 s, 1,440 s, 2,880 s) and maximum resolution Lmax (90, 110, 120).