Justification of the height models available in Latvia
Date
2019-02-28
Journal Title
Journal ISSN
Volume Title
Publisher
Видавництво Львівської політехніки
Abstract
After improvement of geodetic networks in the territory of Latvia, situation is arisen that heights of geodetic points
have changed. Therefore authors study in the research, what regularities form between the Baltic normal height system of
year 1977 (BHS-77) and Latvian Normal Height System LHS-2000,5 height systems in the given points, as well as what
inaccuracies can be observed, if ADTI map sheets are transformed by use of the determined methodology of recalculation
of heights. Aim of the work is to research and analyse measurement data available in reports of improvement of local
geodetic network of Ventspils, Jelgava, and Kuldga and to compare values of heights of geodetic points with historical
values of heights, as well as to give valuation about alignment of height systems. For the achievement of the aim
following tasks are set: to analyse measurements available in the reports of local geodetic networks; to evaluate height
differences between points in BHS-77 and LHS-2000,5 height systems; to give proposals in relation to compatibility of
BHS-77 un LHS-2000,5 height systems. After valuation of data, we can draw conclusion that mutual compatibility of
quasigeoid models LV’98 and LV’14 in all areas of measurement is regarded as appropriate. The historical heights of
points of the local geodetic networks in comparison to improved levelled heights of BAS-77 are regarded as rather
appropriate in local geodetic networks of Jelgava and Kuldga; however, in local geodetic network of Ventspils, they are
regarded as inappropriate.
Description
Keywords
квазігеоїдна модель, система нормальної висоти, LHS-2000, 5, BHS 1977, quasigeoid model, normal height system, LHS-2000, 5, BHS 1977
Citation
Justification of the height models available in Latvia / A. Celms, I. Trevoho, V. Pukite, A. Ratkevics, V. Cintina // Сучасні досягнення геодезичної науки та виробництва. — Львів : Видавництво Львівської політехніки, 2019. — № 2(38). — С. 61–66.