The paper deals with a research in the area of automation of positional star observations. In order to fully employ recent progress in imaging technologies, star image recognition and reference star identification process should gain comparable level of automation. A software package for this purpose has been developed in the Institute of Geodesy of the University of Latvia. It is capable of near-real-time image processing, star identification and astrometric position determination.
Abstract. In Latvia, the issues of the Real Estate Cadastre are arranged; however, it should be noted that part of the issues affecting the Baltic Sea, i.e., the issues of the Marine Cadastre, are not covered by the Real Estate Cadastre. The status of the Baltic coastline is an essential element of infrastructure for all countries around the Baltic Sea. This baseline serves as the key element or reference for the Marine Cadastre. In place-to-place, this line is the dynamic element as it is possible to monitor location with advanced and progressive technologies. The issues of the Marine Cadastre are on the agenda in many EU countries, and several internаtional projects are being reаlized. Land parcels from the sea are registered and maintained in the Cadastre Information System in Latvia. Starting from 2017, the State Land Service of Latvia has started to register coastal areas two kilometres in width from the Baltic Sea baseline. Cadastral information about the Marine Cadastre is being used for spatial planning and taxation.
In 2017 and 2018 GFZ performed two gravimetry campaigns on commercial ferries in the Baltic Sea.The nature of such "non-dedicated" campaigns is different from "dedicated" campaigns that are performed on research vessels with tracks planned according to gravity measurement needs. The nondedicated campaigns use non-survey vessels or survey vessels running for other purposes such as hydrographic measurements, which may require additional corrections. To assess the usefulness of non-dedicated campaigns, we analysed gravity measurements collected on two commercial ferries as part of the EU funded FAMOS project. Besides the typical marine gravimetry corrections, we also investigated the corrections for the vertical accelerations due to the ship's movement and the dynamical effect due to the cross-coupling between horizontal and vertical acceleration components.Taking the latter two corrections into account partly leads to slight improvements, but our results also demonstrate that the standard processing without the two corrections, as used in most of the dedicated campaigns, already delivers good quality end products that fulfil the requirements of a typical marine gravimetry survey with an uncertainty of about 1 mGal. Our findings suggest that gravimetry campaigns on commercial ferries can be used to complement dedicated marine gravimetry campaigns and contribute to geodetic purposes.
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