Experimental aerial photogrammetry with professional non metric camera Canon EOS 5D Galileo Geo Sustavi Ante Sladojević, Goran Mrvoš.

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Presentation transcript:

Experimental aerial photogrammetry with professional non metric camera Canon EOS 5D Galileo Geo Sustavi Ante Sladojević, Goran Mrvoš

Content Introduction Project Specification Camera Calibration Flight plan Aerotriangulation Creating DEM and digital orthophoto Conclusion

Introduction Test professional non metric camera Aerial photogrammetry purpose Will it work in aerial photogrammetry? Reliability? Accuracy?

Project specification - equipment Camera Canon EOS 5D Sensor type 35.8 x 23.9 mm CMOS 12.8 million effective pixels Image size: 4368 x 2912 pix Dimensions: 152 x 113 x 75 mm Wide angle lens (24mm) Camera box and carrier Airplane Cessna 172 Rocket PHOTOMOD 4.1

Project specification - work flow Camera calibration Making flight plan Flying and taking images of selected area Loading images in photomod, aerotriangulation Creation of DEM and digital orthophoto Analyzing results

Camera Calibration Lens (24mm) Characteristics of a camera (focal length, lens distortion) Used software PhotoModeler pro D dimensions calibration grid Results of camera calibration: Focal Length - Value: mm Principal point (Xp, Yp) ( mm, mm) Radial distortion (K1, K2,K3) Decentering distortion (P1, P2)

Flight plan Area = 2.2 km long (city highway) Two strips (52 images) Base 120 m (60%) Distance between strips 310 m (30%) Flying height (300m) Scale 1:12500 Navigation with Garmin GPS

Aerotriangulation PHOTOMOD 4.1 (default configuration) Automatic aerotriangulation (1272 tie points) Correlation (>0.94, parallax <0.010 mm) 10 GCP, 4 beginning and the end of the strips, 2 in the middle of the strips GCP residuals Xm-XgYm-Yg Zm-ZgExy (m) mean absolute RMS Maximum

Creating DEM and digital orthophoto DEM (1m) Vectors and breaklines (Stereo Restitution, PHOTOMOD StereoDraw) Digital othophoto (PHOTOMOD Mosaic) Geometric resolution (0.1m) Digital orthophoto control: Overlap with exisiting data The results were very good - max overlap error was 0.4 m.

Conclusion Good accuracy Large number of images for small areas (1 km=10 images) Not good for large areas (time) Digital non metric camera are getting better and better (16 Mpix, 32 Mpix) Better accuracy's Better resolution (good calibration)

Thank you for your attention ! Questions ?