Setting data acquisition priorities for fused gravity-field models
19/09/2016 | 17:30 | Session 2: Global gravity field modelling
Author(s): Dimitrios Bolkas, Georgia Fotopoulos and Alexander Braun
Dimitrios Bolkas, Georgia Fotopoulos and Alexander Braun
Airborne gravity data play an important role in gravity-field modeling, providing valuable information of the Earth’s gravity field at medium and short wavelengths. In this paper, the impact of airborne gravity data to fused gravity-field models is assessed in order to identify problematic regions and to set data acquisition priorities. Six study regions in the US and Alaska representing different gravity-field variabilities and terrestrial data point-density characteristics are investigated. Satellite, airborne, and terrestrial data are fused using a wavelet decomposition approach to quantify the impact of airborne gravity data to fused gravity field models. Prediction results indicate that airborne gravity impact can reach up to 3mGal (in terms of standard deviation) in Canada and Alaska (over areas of 1º×1º). However, in the US smaller changes are expected (0.2-0.4mGal over areas of 1º×1º) due to the availability of high spatial resolution terrestrial data.