Accuracy assessment of RTK-GNSS equipped UAV conducted as-built surveys for construction site modelling

S Varbla, R Puust, A Ellmann - Survey review, 2021 - Taylor & Francis
Regular as-built surveys have become a necessary input for building information modelling.
Such large-scale 3D data capturing can be conducted effectively by combining structure …

Towards realistic dynamic topography from coast to offshore by incorporating hydrodynamic and geoid models

V Jahanmard, N Delpeche-Ellmann, A Ellmann - Ocean Modelling, 2022 - Elsevier
One of the major factors preventing utilization of realistic sea-level data is that various
sources are referred to inconsistent vertical reference datum (VRD). This study presents a …

Realistic dynamic topography through coupling geoid and hydrodynamic models of the Baltic Sea

V Jahanmard, N Delpeche-Ellmann… - Continental Shelf Research, 2021 - Elsevier
Accurate and compatible sea level data are now more important than ever before, especially
in semi-enclosed sea areas that are highly exploited and surrounded by many countries …

Empirical comparison between stochastic and deterministic modifiers over the French Auvergne geoid computation test-bed

R Goyal, J Ågren, WE Featherstone, LE Sjöberg… - Survey …, 2022 - Taylor & Francis
Since 2006, several different groups have computed geoid and/or quasigeoid (quasi/geoid)
models for the Auvergne test area in central France using various approaches. In this …

Treatment of tide gauge time series and marine GNSS measurements for vertical land motion with relevance to the implementation of the Baltic Sea Chart Datum 2000

S Varbla, J Ågren, A Ellmann, M Poutanen - Remote Sensing, 2022 - mdpi.com
Tide gauge (TG) time series and GNSS measurements have become standard datasets for
various scientific and practical applications. However, the TG and geodetic networks in the …

Determination of accurate dynamic topography for the Baltic Sea using satellite altimetry and a marine geoid model

M Mostafavi, N Delpeche-Ellmann, A Ellmann… - Remote Sensing, 2023 - mdpi.com
Accurate determination of dynamic topography (DT) is expected to quantify a realistic sea
surface with respect to its vertical datum and in identifying sub-mesoscale features of ocean …

Contribution of GRACE satellite mission to the determination of orthometric/normal heights corrected for their dynamics—a case study of Poland

M Szelachowska, W Godah, J Krynski - Remote sensing, 2022 - mdpi.com
Physical heights were traditionally determined without considering the dynamic processes of
the Earth induced from temporal mass variations. The Gravity Recovery and Climate …

Modernization of the Estonian national GNSS reference station network

J Metsar, K Kollo, A Ellmann - Geodesy and Cartography, 2018 - jau.vgtu.lt
Abstract The first GNSS (Global Navigation Satellite System) CORS (Continuously Operating
Reference Station) in Estonia became operational in 1996. Starting from 2008 four Estonian …

Evaluation of quasi-geoid model based on astrogeodetic measurements: case of Latvia

K Morozova, R Jäger, A Zarins, J Balodis… - Journal of Applied …, 2021 - degruyter.com
Since the development of GNSS techniques, the determination of a precise quasi-geoid
model has become even more actual. In terms of this project the staff of the Institute of …

Validation of copernicus sea level altimetry products in the baltic sea and estonian lakes

A Liibusk, T Kall, S Rikka, R Uiboupin, Ü Suursaar… - Remote Sensing, 2020 - mdpi.com
Multi-mission satellite altimetry (eg, ERS, Envisat, TOPEX/Poseidon, Jason) data have
enabled a synoptic-scale view of ocean variations in past decades. Since 2016, the Sentinel …