Designing issues of the geodetic vertical reference network of Lithuania

Krikštaponis, Boleslovas; Paršeliūnas, Eimuntas; Viskontas, Povilas; Neseckas, Algirdas; Zigmantienė, Evelina; Kolosovskis, Ričardas; Musteikis, Arvydas; Tumelienė, Eglė; Birvydienė, Rosita; Petroškevičius, Petras

doi:10.3846/enviro.2014.223

Cited by 3 publications

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References 2 publications

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“…Lithuanian digital geoid model will be improved after completing the first and second order of geodetic vertical network, as well terrestrial gravity measurements. This will enable to derive normal height from ellipsoidal heights determined by GNSS and replace traditional levelling of lower orders [10].…”

Section: Introductionmentioning

confidence: 99%

Common Studies of National Height System in Latvia and Lithuania

Celms¹,

Reke²,

Kaminskis³

2018

Civil Engineering

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Already after our independence in the nineties of the twentieth century, we used common height system-Baltic Normal height system 1977 (BHS 1977). Latter we have made big job for verification and modernization of our geodetic network in the frames of different international campaigns. There we always cooperating with Nordic countries in frames of Nordic Geodetic Commission (NKG). Also we have had sector programme between Denmark and Baltic countries about modernization of geodetic network. Already in that time we carried out common work in the field of gravity survey, levelling and GNSS observation. As European Union member states-Latvia and Lithuania have changed their national height systems to European Vertical Reference System realizations. Latest product of such efforts, we have freely available latest Nordic quasi-geoid model NKG2015, too. For studies of height network consistency in regional and international level we carry out GNSS observation campaigns and making comparison of the obtained survey results and computed ones from different geoid models, for example LV98, NKG2015, EGG2015 etc. In such way, we are making conclusions about quality of geodetic network and giving recommendation for the future work. The aim of the research is using GNSS measurements gain insight for methodology development of geodetic point height testing. To achieve the aim following tasks were set: 1) perform GNSS measurements of first order levelling network points in Latvia and Lithuania; 2) to do data processing to get station coordinates; 3) to compare point elevations. For GNSS measurements use for height determination it is very significantly to use advanced measuring technologies and verified data processing methodology. RMS errors describe high accuracy of performed measurements.

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Section: Introductionmentioning

confidence: 99%

Common Studies of National Height System in Latvia and Lithuania

Celms¹,

Reke²,

Kaminskis³

2018

Civil Engineering

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“…Lithuanian digital geoid model will be improved after completing the first and second order of geodetic vertical network. This will enable to derive normal height from ellipsoidal heights determined by GNSS and replace traditional levelling of lower orders (Krikštaponis et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

National height system testing using GNSS measurements in Latvia and Lithuania

Reke¹,

Celms²,

Reiniks³

2017

Research for Rural Development

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As European Union member states -Latvia and Lithuania have changed their national height systems from Baltic Normal Height System 1977 to European Vertical Reference System realizations. Performing practical Global Navigation Satellite System (GNSS) measurements and obtained data mathematical processing, there is a possibility to calculate point height difference between GNSS data and data of 1 st order levelling networks. The aim of the research is to gain insight for methodology development of geodetic point height testing using GNSS measurements. To achieve the goal following tasks are set: 1) perform GNSS measurements of first order levelling network in Latvia and Lithuania; 2) do data processing to get point ellipsoidal height and compare with the point normal height; 3) detect technically feasible accuracy of geoid model for precise height measurements with GNSS method within research area. Performing GNSS measurements at the same time in the territory of Latvia and Lithuania, the experience of mutual cross-border cooperation was accumulated. The results were adjusted with academic software package Bernese and were obtained point ellipsoidal and normal heights. The height measurement accuracy using GNSS method depends on geoid model accuracy and more precise results can be obtained increasing used geoid model accuracy to 1.5 to 2 cm.

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