1. Senior Researcher, Institute of Geodesy and Geoinformatics, Univ. of Latvia, Rīga LV-1004, Latvia (corresponding author). ORCID: .
2. Senior Researcher, Institute of Geodesy and Geoinformatics, Univ. of Latvia, Rīga LV-1004, Latvia.
3. Senior Researcher, Institute of Geodesy and Geoinformatics, Univ. of Latvia, Rīga LV-1004, Latvia, ORCID: .
4. Professor and Senior Researcher, Dept. of Land Management and Geodesy, Latvia Univ. of Life Sciences and Technologies, Jelgava LV-3001, Latvia.