Development of the One Centimeter Accuracy Geoid Model of Latvia for GNSS Measurements

Balodis, Jānis; Silabriedis, Gunārs; Haritonova, Diāna; Kaļinka, Māris; Janpaule, Inese; Morozova, Katerīna; Jumare, Izolde; Mitrofanovs, Ingus; Zvirgzds, Jānis; Kaminskis, Jānis; Liepiņš, Ivars

doi:10.1088/1757-899x/96/1/012037

Cited by 1 publication

(1 citation statement)

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“…Those GNSS measurements were performed in time span 2010-2014 and the results in LKS-92 framework were computed. However, the difference between LatPos station coordinates in ETRS89 and LKS92 frameworks correspondingly has achieved the notable values (Balodis et al 2015;Kenyeres et al 2015aKenyeres et al , 2015b. In order to avoid discrepancies all the LGIA performed GNSS measuring results are reduced to the ETRS89 to date 2015.0.…”

Section: Densification Of the Gnss/levelling Network For Geoid Controlmentioning

confidence: 99%

Changing the National Height System and Geoid Model in Latvia

Balodis

Morozova

Silabriedis

et al. 2016

Geodesy and Cartography

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According to the decision of IAG Reference Frame Sub-commission for Europe (EUREF) the EVRF2007 solution as the vertical reference has to be deployed in EU countries.The new height system LAS-2000,5 had been enacted as the European Vertical Reference System‘s EVRF2007 realization in Latvia and the new geoid model LV‘14 had been introduced by Latvian authority Latvian Geospatial Information Agency. However, the appreciation of the quality of quasi-geoid model LV‘14 is rather contradictious among the users in Latvia. The independent estimate and comparison of the two Latvian geoid models developed till now has been performed by the Institute of Geodesy and Geoinformatics. Previous geoid model LV98 which was developed for Baltic-1977 height system almost 20 years ago is outdated now. Preparatory actions described in order to fulfil the task of comparison the geoids in two different height systems. The equations and transformation parameters are presented in this article for the normal height conversion from Baltic-1977 height system to the Latvian realization named LAS-2000,5. The comparison is performed of both Latvian quasigeoid models – the new one LV‘14 and previous LV98. The quality of both models estimated by controlling the geoid heights at the properly densified GNSS/levelling network sites. The distribution of discrepancies in comparison with normal distribution N(x,μ,s) is depicted in corresponding figures. For LV‘14 quasi-geoid model the standard deviation of discrepancies is 3.2 cm, 75% of discrepancies x ≤ 3.2 cm. For LV98 quasigeoid model the standard deviation of discrepancies is 4.7 cm, 80% of discrepancies x ≤ 6 cm. Without doubt, the newly developed LV‘14 quasi-geoid model is of higher quality.

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Section: Densification Of the Gnss/levelling Network For Geoid Controlmentioning

confidence: 99%