Changing the national height system and GEOID model in Latvia
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 n...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Vilnius Gediminas Technical University
2016-04-01
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| Series: | Geodesy and Cartography |
| Subjects: | |
| Online Access: | https://journals.vgtu.lt/index.php/GAC/article/view/2502 |
| _version_ | 1818873167550087168 |
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| author | Janis Balodis Katerina Morozova Gunars Silabriedis Maris Kalinka Kriss Balodis Ingus Mitrofanovs Irina Baltmane Izolde Jumare |
| author_facet | Janis Balodis Katerina Morozova Gunars Silabriedis Maris Kalinka Kriss Balodis Ingus Mitrofanovs Irina Baltmane Izolde Jumare |
| author_sort | Janis Balodis |
| collection | DOAJ |
| description | 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 Previous geoid model LV98 which was developed for Baltic-1977 height system almost 20 years ago is outdated now.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. |
| first_indexed | 2024-12-19T12:50:24Z |
| format | Article |
| id | doaj.art-e13005411957482aa554abff6d85c6f8 |
| institution | Directory Open Access Journal |
| issn | 2029-6991 2029-7009 |
| language | English |
| last_indexed | 2024-12-19T12:50:24Z |
| publishDate | 2016-04-01 |
| publisher | Vilnius Gediminas Technical University |
| record_format | Article |
| series | Geodesy and Cartography |
| spelling | doaj.art-e13005411957482aa554abff6d85c6f82022-12-21T20:20:36ZengVilnius Gediminas Technical UniversityGeodesy and Cartography2029-69912029-70092016-04-0142110.3846/20296991.2016.1168009Changing the national height system and GEOID model in LatviaJanis Balodis0Katerina Morozova1Gunars Silabriedis2Maris Kalinka3Kriss Balodis4Ingus Mitrofanovs5Irina Baltmane6Izolde Jumare7Institute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaInstitute of Geodesy and Geoinformatics, University of Latvia, Riga, LatviaAccording 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.https://journals.vgtu.lt/index.php/GAC/article/view/2502quasi-geoid determinationEVRF2007LV’14LV98GPS/levelling network densificationETRS89 |
| spellingShingle | Janis Balodis Katerina Morozova Gunars Silabriedis Maris Kalinka Kriss Balodis Ingus Mitrofanovs Irina Baltmane Izolde Jumare Changing the national height system and GEOID model in Latvia Geodesy and Cartography quasi-geoid determination EVRF2007 LV’14 LV98 GPS/levelling network densification ETRS89 |
| title | Changing the national height system and GEOID model in Latvia |
| title_full | Changing the national height system and GEOID model in Latvia |
| title_fullStr | Changing the national height system and GEOID model in Latvia |
| title_full_unstemmed | Changing the national height system and GEOID model in Latvia |
| title_short | Changing the national height system and GEOID model in Latvia |
| title_sort | changing the national height system and geoid model in latvia |
| topic | quasi-geoid determination EVRF2007 LV’14 LV98 GPS/levelling network densification ETRS89 |
| url | https://journals.vgtu.lt/index.php/GAC/article/view/2502 |
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