Analysis of Free‐Air Anomalies on the Seaway of the Gulf of Gdańsk: A Case Study

Abstract

In this paper, we present an attempt to determine the accuracy of shipborne gravimetry for the needs of geoid determination. The shipborne gravity campaign, described in this article, is the beginning of a series of gravimetry measurements in the Polish Exclusive Economy Zone. The campaign was conducted in the area where the accuracy of geoid determination is crucial for the safety of navigation on numerous intersecting ships' routes. The vicinity of the seashore, various depths, and short-lasting campaign enabled determination of the level of measurement accuracy that can be obtained depending on the conditions. Internal data consistency was estimated as well as an attempt to compute external accuracy. The data were compared with satellite data available for the region. We identified which of the differences are related to the influence of external factors.

Research on gravity field modelling and gravimetry in Poland in 2019–2022

“…In recent years, the team from the Gdansk University of Technology has conducted a number of marine gravimetric measurements in the Baltic Sea within the MORGRAV project. The internal accuracy of these shipborne gravity data in the Gulf of Gdansk was assessed by using a cross-section analysis (Pyrchla et al, 2020). Internal consistency of the measurements was estimated as 1.13 mGal.…”

Accuracy of marine gravimetric measurements in terms of geodetic coordinates of land reference benchmark

“…It should be noted that in the 1970s, measurements made with an accuracy of 2 mGal (1 mGal = 10 -5 m/s^2) were considered truly accurate. Nowadays, gravimetric measurements at sea are feasible with an error of less than 1 mGal [16]. Achieving such accuracy requires a control check of all measurement stages, including a catalogue value of the reference station.…”