1. Photogrammetry as a research tool Greg Burgess DERF November 2008

2. Measurement of direction from an image

3. Photographic determination of the coordinates of a point Figure: Geodetic Services Inc

4. Photographic determination of the coordinates of many points Figure: Geodetic Services Inc

5. Camera positions

6. Camera calibration Camera parameters to determine: Principal distance Principal distance Principal point location Principal point location Lens distortions Lens distortions

7. Archaeological photogrammetry Image of the Medina of Fes, Morocco, processed used TIPHON software, M Koehl

8. Mirror panel mould photogrammetry

9. Mirror panel photogrammetry

11. A very big dish… Image courtesy of the NAIC - Arecibo Observatory

12. SG4 jig

14. Photo: J Preston

16. Photo taken by someone who is less afraid of heights than me

17. Jig with retro-reflective targets

18. Vision Measurement System (VMS)

19. Problems… Principal point instability Principal point instability

20. Problems… Dew Dew

21. FSJ4 1 Oct 2008 results Estimated measurement accuracy: σx & σy ≈ 0.5 mm, σz = 0.35 mm σx & σy ≈ 0.5 mm, σz = 0.35 mm RMS height deviation of mounting points from the ideal paraboloid: σh = 0.56 mm Internal measurement precision: 1:230,000

22. Photo: M Shortis