Part I: Reference Systems and Frames.- Towards an International Height Reference Frame Using Clock Networks.- Towards the realization of the International Height Reference Frame (IHRF) in Argentina.- Comparing Vienna CRF solutions to Gaia-CRF2.- Co-Location of Space Geodetic Techniques: Studies on Intra-Technique Short Baselines.- Status of IGS Reprocessing Activities at GFZ.- A Wavelet-based Outlier Detection and Noise Component Analysis for GNSS Position Time Series.- Part II: Gravity field modelling.- International Combination Service for Time-variable Gravity Fields (COST-G) - Start of operational phase and future perspectives.- LUH-GRACE2018: a new time series of monthly gravity field solutions from GRACE.- A Precise Geoid Model for Africa: AFRgeo2019.- Part III: Earth rotation and geodynamics.- A first assessment of the corrections for the consistency of the IAU2000 and IAU2006 precession-nutation models.- Report of the IAU/IAG Joint Working Group on Theory of Earth rotation and validation.- Achievements of the first 4 years of the International Geodynamics and Earth Tide Service (IGETS) 2015 - 2019.- Inter-comparison of ground gravity and vertical height measurements at collocated IGETS stations.- Part IV: Multi-Signal Positioning, Remote Sensing and Applications.- A Benchmarking Measurement Campaign to Support Ubiquitous Localization in GNSS Denied and Indoor Environments.- A method to correct the raw Doppler observations for GNSS velocity determination.- Assessment of a GNSS/INS/Wi-Fi Tight-Integration Method Using Support Vector Machine and Extended Kalman Filter.- Enhancing navigation in difficult environments with low-cost, dual-frequency GNSS PPP and MEMS IMU.- Part V: Monitoring and Understanding the Dynamic Earth with Geodetic Observations.- Water Depletion and Land Subsidence in Iran using Gravity, GNSS, InSAR and Precise Levelling Data.- Past and future sea level changes and land uplift in the Baltic Sea seen by geodetic observations.- Estimation of Lesser Antilles vertical velocity fields using a GNSS-PPP software comparison.- Time variations of the vertical component in Japanese GEONET GNSS sites.- An approximate method to simulate post-seismic deformations in a realistic Earth model.- Geodetic monitoring of the variable surface 1 deformation in Latin America.- Progress in GTEWS ground displacement measurements and tsunami warning.- Part VI: Geodesy for Atmospheric and Hydrospheric Climate Research (IAG, IAMAS, IACS, IAPSO).- Characterization of the Upper Atmosphere from Neutral and Electron Density Observations.- Tropospheric products from high-level GNSS processing in Latin America.- Can vertical GPS displacements serve as proxies for climate variability in North America?.- Tracking Hurricanes using GPS atmospheric precipitable water vapor field.- Continuous monitoring with a superconducting gravimeter as a proxy for water storage changes in a mountain catchment.- Least-Squares Spectral and Coherency Analysis of the Zenith Total Delay Time Series at SuomiNet Station SA56 (UNB2).