Precision point determination for distortion investigation on Michaelis church in Luneburg (West Germany) with simultaneous calibration of the photogrammetric system

Simultaneous calibration of a photogrammetric system including a camera, photographic layer carrier, a developing device and a measuring system to attain a 1 mm accuracy for point determination is applied to measure quantitatively and qualitatively the subsidence movements leading to distortion and damage to a church. The church interior is photogrammetrically represented with points. Photogrammetric observations and conditions and geodetic measurements are compared with the computer system BINGO. A 5mm deviation in eccentricity is noted. All camera unknowns can be accurately determined. Simultaneous calibration of the camera can be performed with high precision with a photogrammetric photograph. Measurements should be performed to determine later damage and actions to be taken to stabilize the church.