Deflection of Vertical Effect on Direct Georeferencing in Aerial Mobile Mapping Systems : A Case Study in Sweden

• GNSS/INS applications are being developed, especially for direct georeferencing in airborne photogrammetry. Achieving accurately georeferenced products from the integration of GNSS and INS requires removing systematic errors in the mobile mapping systems. The INS sensor's uncertainty is decreasing; therefore, the influence of the deflection of verticals (DOV, the angle between the plumb line and normal to the ellipsoid) should be considered in the direct georeferencing. Otherwise, an error is imposed for calculating the exterior orientation parameters of the aerial images and aerial laser scanning. This study determines the DOV using the EGM2008 model and gravity data in Sweden. The impact of the DOVs on horizontal and vertical coordinates, considering different flight altitudes and camera field of view, is assessed. The results confirm that the calculated DOV components using the EGM2008 model are sufficiently accurate for aerial mapping system purposes except for mountainous areas because the topographic signal is not modelled correctly. 

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

aerial mobile mapping systems

deflection of verticals

direct georeferencing

EGM2008

geoid

photogrammetry

Global positioning system

Mapping

Systematic errors

Aerial mobile mapping system

Case-studies

Deflection of vertical

Exterior orientation parameters

Mobile mapping systems

Remote-sensing

Sensor uncertainty

Antennas

deflection

GNSS

laser

Sweden

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)