The Kattegat sea region between Denmark and Sweden is identified as a region both economically and environmentally sensitive. Statistics indicate that over two thousand vessels per day navigate in the region. Navigation route optimization for the region is vital for efficient transportation. Optimized routes allow a vessel to carry the maximum amount of goods per course leading to efficient fuel consumption, which can greatly benefit in an economical and environmental aspect. Such optimization requires a highly accurate and reliable vertical reference surface for efficient transportation. In the Baltic Sea and Kattegat, a geoid is now used as such a surface. For geoid modelling, homogenous and reliable gravity measurements are required over a larger area surrounding the computation point. The Kattegat region consists of gravity data mainly from the Swedish Fyrbyggaren marine campaign 2019, Kattegat airborne campaign 2018 and several older datasets from the Nordic Geodetic Commission (NKG) database. These gravity data over Kattegat region have been measured using different instruments in various time epochs that inherit them with uncertainties depending on the platform type, instrument sensor type, filter type, corrections applied, processing software and many other parameters. In this study, the data uncertainty of gravity measurements from various sensors in the Kattegat region was studied through statistical and graphical evaluations. It was found out that the data from Kattegat airborne campaign 2018 deviate systematically with from the more reliable Fyrbyggaren marine campaign 2019 and other marine datasets. The airborne campaign was therefore tentatively corrected by the estimated shift +1.46 mGal before further analysis was made of the other datasets. It is found that NKG publication numbers 29, 42, 44, 610, 611 and 616 from the NKG gravity database have a standard uncertainty of around 2-3 mGal. Which is within the range of allowable uncertainty for future applications. These datasets may thus positively contribute to NKG database along with data from the Swedish Fyrbyggaren marine campaign 2019 and the shifted Kattegat airborne campaign 2018. These datasets should be used to model the geoid over the region in the future.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:hig-34204 |
| Date | January 2020 |
| Creators | Fonseka, Chrishan |
| Publisher | Högskolan i Gävle, Samhällsbyggnad |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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