Comparative analyses of quasigeoid models for the Republic of Moldova territory

Abstract

В даній статті представлені результати порівняння моделей квазігеоїда для території Республіки Молдова з використанням GNSS-вимірювань для нівелювання.Starting from 2011 a GNSS reference stations network reference system and MoldPos service was established by Land Relation and Cadastre Agency financed by Norwegian Government. In order to provide all necessary information not only for 2D positioning, but also for GNSS-based normal height computation the quasigeoid model was integrated in RTCM transformation messages to allow real time normal height determination for large scale mapping. This paper presents the results of comparative study of existing quasigeoid models on territory of our country using control GNSS/Levelling measurements. Comparative study between GM2005, GM2010, GM2012 and EGM2008 quasigeoid models, currently used for large scale mapping, showed the best accuracy 4,8 cm of GM2005 with 4 parameters that could be used for large scale mapping for all territory of the country. The analyses of GM2005 residuals showed the best results in the middle and eastern part country territory and the worse on the western borders were is a lack of high quality data. The results of this study could be used by Land Relation and Cadastre Agency for argumentation of necessity to continue densification of National Gravity Network in order to achieve high accuracy quasigeoid model.В данной статье представлены результаты сравнения моделей квазигеоида для территорий Республики Молдова с использованием GNSS-измерений для нивелирования.