From Discrete Gravity Survey Data to a High-resolution Gravity Field Representation in the Nordic-Baltic Region

Marine Geodesy 2017
Silja Märdla, Jonas Ågren, Gabriel Strykowski, Tonis Oja, Artu Ellmann, René Forsberg, Mirjam Bilker-Koivula, Ove D. Omang, Eimuntas Kazimieras Paršeliūnas, Ivars Liepiņš, Jānis Kaminskis

The deduction of a regularly spaced gravity anomaly grid from scattered survey data is studied, addressing mainly two aspects: reduction of gravity to anomalies and subsequent interpolation by various methods. The problem is illustrated in a heterogeneous study area and contrasting test areas including mountains, low terrains, and a marine area. Provided with realistic error estimates, Least Squares Collocation interpolation of Residual Terrain Model anomalies yields the highest quality gravity grid. In most cases, the Bouguer reduction and other interpolation methods tested are equally viable. However, spline-based interpolation should be avoided in marine areas with trackwise survey data.

Keywords
Bouguer anomaly | gravity database | gridding | interpolation | Nordic Geodetic Commission (NKG) | regional geoid | residual gravity anomaly | Residual Terrain Model (RTM) anomaly
DOI
10.1080/01490419.2017.1326428
Hyperlink
http://www.tandfonline.com/doi/full/10.1080/01490419.2017.1326428

Märdla, S., Ågren, J., Strykowski, G., Oja, T., Ellmann, A., Forsberg, R., Bilker-Koivula, M., Omang, O., Paršeliūnas, E., Liepiņš, I., Kaminskis, J. From Discrete Gravity Survey Data to a High-resolution Gravity Field Representation in the Nordic-Baltic Region. Marine Geodesy, 2017, Vol.40, Iss.6, pp.416-453. ISSN 0149-0419. Available from: doi:10.1080/01490419.2017.1326428

Publication language
English (en)