Photogrammetry as a research tool Greg Burgess DERF November 2008.

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Presentation transcript:

Photogrammetry as a research tool Greg Burgess DERF November 2008

Measurement of direction from an image

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

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

Camera positions

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

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

Mirror panel mould photogrammetry

Mirror panel photogrammetry

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

SG4 jig

Photo: J Preston

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

Jig with retro-reflective targets

Vision Measurement System (VMS)

Problems… Principal point instability Principal point instability

Problems… Dew Dew

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

Photo: M Shortis