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Articles | Volume XLIII-B2-2022
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2022, 15–20, 2022
https://doi.org/10.5194/isprs-archives-XLIII-B2-2022-15-2022
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2022, 15–20, 2022
https://doi.org/10.5194/isprs-archives-XLIII-B2-2022-15-2022
 
30 May 2022
30 May 2022

IMPORTANCE OF PRECISE GRAVITY FIELD MODELING IN DIRECT GEOREFERENCING AND AERIAL PHOTOGRAMMETRY: A CASE STUDY FOR SWEDEN

M. Bagherbandi1,2, A. Jouybari1, F. Nilfouroushan1,3, and J. Ågren1,3 M. Bagherbandi et al.
  • 1Faculty of Engineering and Sustainable Development, University of Gävle, Gävle, Sweden
  • 2Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden
  • 3Department of Geodetic Infrastructure, Geodata Division, Lantmäteriet, Gävle, Sweden

Keywords: deflection of verticals, geoid, EGM2008, direct georeferencing, photogrammetry

Abstract. Direct georeferencing of airborne mobile mapping systems is developing with unprecedented speed using GNSS/INS integration. Removal of systematic errors is required for achieving a high accurate georeferenced product in mobile mapping platforms with integrated GNSS/INS sensors. It is crucial to consider the deflection of verticals (DOV) in direct georeferencing due to the recently improved INS sensor accuracy. This study determines the DOV using Sweden’s EGM2008 model and gravity data. The influence of the DOVs on horizontal and vertical coordinates and considering different flight heights is assessed. The results confirm that the calculated DOV components using the EGM2008 model are sufficiently accurate for aerial photogrammetry purposes except for the mountainous areas because the topographic signal is not modeled correctly.