10.5880/ICGEM.2018.003 Mayer-Gürr, Torsten Torsten Mayer-Gürr 0000-0003-2609-428X Graz University of Technology, Graz, Austria Behzadpur, Saniya Saniya Behzadpur 0000-0003-1187-3862 Graz University of Technology, Graz, Austria Ellmer, Matthias Matthias Ellmer 0000-0001-9008-7784 Graz University of Technology, Graz, Austria Kvas, Andreas Andreas Kvas 0000-0003-1199-7742 Graz University of Technology, Graz, Austria Klinger, Beate Beate Klinger 0000-0001-9625-8230 Graz University of Technology, Graz, Austria Strasser, Sebastian Sebastian Strasser 0000-0001-8045-5360 Graz University of Technology, Graz, Austria Zehentner, Norbert Norbert Zehentner Graz University of Technology, Graz, Austria GFZ Data Services 2018 GRACE ICGEM gravity field temporal gravity field models EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY Ince, Sinem Sinem Ince GFZ German Research Centre for Geosciences, Potsdam, Germany Reißland, Sven Sven Reißland GFZ German Research Centre for Geosciences, Potsdam, Germany Mayer-Gürr, Torsten Graz University of Technology 2002-04/2016-08 Dataset 10.5880/icgem.2016.007 https://meetingorganizer.copernicus.org/EGU2018/EGU2018-11833.pdf 10.1007/978-3-319-10837-7_14 10.1016/j.asr.2017.04.015 10.1016/j.asr.2016.08.007 http://ifg.tugraz.at/ITSG-Grace2018 CC BY 4.0 The ITSG-Grace2018 gravity field model is the latest GRACE-only gravity field model computed at Graz University of Technology, providing unconstrained monthly and regularized daily solutions as well as a long-term static field. For each month of the observation period, sets of spherical harmonic coefficients for different maximum degrees (60, 96, 120) were estimated without applying any regularization.


In order to resolve high-frequency gravity field variations as detailed as possible, a set of spherical harmonic coefficients up to degree and order 40 was co-estimated. K-band range rates with a sampling of 5 seconds and kinematic orbits with a sampling of 5 minutes were used as observations. The kinematic orbits of the GRACE satellites (Zehentner and Mayer-Gürr 2013, 2014) were processed using the GPS orbits and clock solutions provided by CODE. Additionally, a full accelerometer scale factor matrix was estimated per day (Klinger and Mayer-Gürr, 2016). The accelerometer bias was modelled through cubic splines with a node interval of six hours and estimated for each axis and day. Detailed information about ITSG-Grace2018 is available at http://ifg.tugraz.at/ITSG-Grace2018. The monthly and daily data covers the period between April 2002 and August 2016.
Monthly solutions:
product_type gravity_field
modelname ITSG-Grace2018_nLL_YYYY-MM
earth_gravity_constant 3.9860044150e+14
radius 6.3781363000e+06
max_degree LL errors formal
norm fully_normalized
tide_system zero_tide


Daily solutions:
product_type gravity_field
modelname ITSG-Grace2018_n40_YYYY-MM-DD
earth_gravity_constant 3.9860044150e+14
radius 6.3781363000e+06
max_degree 40
errors formal
norm fully_normalized
tide_system zero_tide


Static Field:
product_type gravity_field
modelname ITSG-Grace2018s
earth_gravity_constant 3.9860044150e+14
radius 6.3781363000e+06
max_degree 200
errors formal
norm fully_normalized
tide_system zero_tide
ITSG-Grace2018 daily and monthly models -180 180 -90 90