From Imagery to Map: Digital Photogrammetric Technologies 15 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric.

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Presentation transcript:

From Imagery to Map: Digital Photogrammetric Technologies 15 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric Technologies Camera calibration for UAS. Different approaches Smirnov Alexey Technical Support Department, Racurs October 2015, Yucatan, Mexico

Objectives UAS certification (MIIGAiK) Processing UAS imagery with different calibration methods Distortion plotting Results analyzing

Scientific training area MIIGAiK Department of photogrammetry

Cameras Point and shoot camera Single-lens reflex camera Industrial camera

Objects Area 4 sq.km.

Distortion Physical distortion Mixed distortion

Test № m (GSD-6 cm)600 m (GSD-4 cm) Phase One IXU 150 (f-55 mm) Ground control points – 109, check points – 19

UAV Orlan-10 Gasoline engine Max. take-off weight: 21 kg Wing span: 3.1 m Max. range: 1000 km Flight altitude: m Max. flight time: 10 h Specifications CMOS sensor Sensor size: 8280x6208 pix Focal length: 55 mm Phys. pixel size: 5.3 mkm Central shutter Phase One IXU 150

Calibration parameters Project 600 m800 m Calibration methods W/O calibration Lab calibration Self- calibration (Phys) Lab calibration + phys self- calibration Self- calibration (Mix) Lab calibration + mix self- calibration W/O calibration Lab calibration Self- calibration (Phys) Lab calibration + phys self- calibration Self- calibration (Mix) Lab calibration + mix self- calibration Focal lengthmm Principal point (PPA, PPS) X, mm Y, mm Distortion K e e e e e e e e e e-05 K e e e e e e e e e e-09 K e e-12

Test № m (GSD-5 cm) Nikon D 800 (f-50 mm) Ground control points – 96, check points – 18

UAV Ptero-G0 Gasoline engine Max. take-off weight: 21 kg Wing span: 3.13 m Max. range: 800 km Flight altitude: m Max. flight time: 8 h Specifications Nikon D 800 CMOS sensor Sensor size: 7360x4912 pix Focal length: 50 mm Phys. pixel size: 4.9 mkm Two-curtain shutter

Calibration parameters Project Nikon D 800 Calibration methods W/O calibrationLab calibrationSelf-calibration (Phys) Lab calibration + phys self-calibration Self-calibration (Mix) Lab calibration + mix self-calibration Focal lengthmm Principal point (PPA, PPS) X, mm Y, mm Distortion K e e e e e-05 K e e e e e-08 K e-12

Test № m (GSD-7 cm) Sony NEX 5N (f-16 mm) Ground control points – 87, check points – 15

UAV Geoscan 101 Electric engine Max. take-off weight: 2.3 kg Wing span: 1.4 m Max. range: 80 km Flight altitude: m Max. flight time: 1.5 h Specifications Sony NEX 5N CMOS sensor Sensor size: 4912x3264 pix Focal length: 16 mm Phys. pixel size: 4.9 mkm Two-curtain shutter

Calibration parameters Project Sony NEX 5N Calibration methods W/O calibrationLab calibrationSelf-calibration (Phys) Lab calibration + phys self-calibration Self-calibration (Mix) Lab calibration + mix self-calibration Focal lengthmm Principal point (PPA, PPS) X, mm Y, mm Distortion K K e e e e e-06 K e-12-4e-12

Distortion plotting (Lab calibration)

Distortion plotting (Phys self-calibration)

Distortion plotting (Mix self-calibration)

Distortion plotting (3D)

Results analyzing (test № 1) Project 600 m (GSD 4 cm)800 m (GSD 6 cm) Calibration methods W/O calibration (m) Lab calibration (m) Self- calibration (Phys) (m) Lab calibration + phys self- calibration (m) Self- calibration (Mix) (m) Lab calibration + mix self- calibration (m) W/O calibration (m) Lab calibration (m) Self- calibratio n (Phys) (m) Lab calibration + phys self- calibration (m) Self- calibration (Mix) (m) Lab calibration + mix self- calibration (m) Check pointsRMS XY Z XY Phase One IXU 150 (f-55mm)

Results analyzing (test № 2, 3) Project Nikon D 800 (GSD 4 cm)Sony NEX 5N (GSD 5 cm) Calibration methods W/O calibration (m) Lab calibration (m) Self- calibration (Phys) (m) Lab calibration + phys self- calibration (m) Self- calibration (Mix) (m) Lab calibration + mix self- calibration (m) W/O calibration (m) Lab calibration (m) Self- calibratio n (Phys) (m) Lab calibration + phys self- calibration (m) Self- calibration (Mix) (m) Lab calibration + mix self- calibration (m) Check pointsRMS XY Z XYZ

Image quality Nikon D800 (GSD-5cm)Sony NEX 5N (GSD-5cm)

Conclusions Prerequisites for obtaining large scale orthophoto For cameras with central shutter – For cameras with two-curtain shutter – XYMix self-calibration Z Lab calibration + mix self-calibration XYMix self-calibration Z Lab calibration + mix self-calibration

Thank you for attention