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Experimental aerial photogrammetry with professional non metric camera Canon
EOS 5D
Galileo Geo SustaviAnte 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 5.0. • 2D dimensions calibration grid• Results of camera calibration:
• Focal Length - Value: 23.811862 mm• Principal point (Xp, Yp)
• (17.311063 mm, 11.615114 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-Xg Ym-Yg Zm-Zg Exy (m)• mean absolute 0.038 0.045 0.160 0.062 • RMS 0.046 0.053 0.184 0.070 • Maximum 0.087 0.102 0.316 0.134
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?