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From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric.

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Presentation on theme: "From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric."— Presentation transcript:

1 From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric Technologies Scientific UAS training for mapping Smirnov Alexey Manager of Technical Support Department, Racurs September 2013, Fontainebleau, France

2 Scientific training area MIIGAiK Department of photogrammetry June 2013

3 UAS Models GeoScan 101Gatewing X100 Ptero-E5

4 Objectives Process Ptero UAS imagery with high-precision projection centers coordinates Compare accuracy of adjustment for Ptero data over small area vs whole block Compare accuracy of adjustment results from different UAS models

5 Technological workflow Orthophoto control DEMAerotriangulation

6 Objects Area 4 sq.km.Road 5 km.

7 Testing with accurate centers (Ptero) GPS position adjustment accuracy (using Obninsk base station) is 6 cm * * By GNSS+ company

8 Spatial offset Offset vector : x=0.047 m, y=0.110 m, z=0.194 m

9 Time offset Nikon D800NovAtel OEM615 Synchronization problem is caused by two-curtain shutter

10 Adjustment result by centers Errors Projection Centers ~30 cm by XY Check points ~33 cm by XY ~20 cm by Z ~34 cm by Z GCD – 2 cm

11 Adjustment result by centers and GCPs Errors Projection Centers ~30 cm by XY Check points ~16 cm by XY ~16 cm by Z GCD – 2 cm

12 Orthophoto quality GSD – 2 cm

13 Orthophoto accuracy (relative) Positional accuracy Δ ~ 18 cm Vectors from stereo of DiMAC survey

14 Orthophoto accuracy (absolute) E abs Δmin. – 6 cm Δmax. – 16 cm Accuracy corresponds to scale 1:2000

15 Small test area (Ptero) Errors Projection Centers ~17 cm by XY Check points ~7 cm by XY ~10 cm by Z ~9 cm by Z

16 Small test area (Ptero) E abs Δmin. – 2 cm Δmax. – 7 cm Accuracy corresponds to scale 1:1000

17 Small test area (GeoScan) Errors Projection Centers ~3 m by XY Check points ~22 cm by XY ~16 m by Z ~30 cm by Z GSD – 7.2 cm

18 Small test area (GeoScan) E abs Δmin. – 13 cm Δmax. – 23 cm Accuracy corresponds to scale 1:2000

19 Small test area (Gatewing) Errors Projection Centers ~7.5 m by XY Check points ~6 cm by XY ~20 m by Z ~18 cm by Z GSD – 4.7 cm

20 Small test area (Gatewing) E abs Δmin. – 14 cm Δmax. – 22 cm Accuracy corresponds to scale 1:2000

21 Difference ModelsCamera altitude, m Number of frames Area, sq.m. Centers accuracy Orthophoto accuracy (absolute), cm GSD, cm/pix Ptero-E5 Nikon D800 (calibrated) ~ ~17 cm by XY ~10 cm by Z GeoScan 101 Sony NEX- 5R ~ ~3 m by XY ~16 m by Z Gatewing X100 Ricoh-GR ~ ~7.5 m by XY ~20 m by Z

22 Conclusions Prerequisites for obtaining large scale orthophoto Use differential GNSS for projection centers coordinates Avoid large heading-pitch-roll angles Use appropriate ground control Use appropriate GSD Use calibrated camera

23 Thank you for attention


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