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) ~250 97280 ~17 cm by XY ~10 cm by Z 7 2.2 GeoScan 101 Sony NEX- 5R ~200 38800 ~3 m by XY ~16 m by Z 23 7.2 Gatewing X100 Ricoh-GR ~150 130360 ~7.5 m by XY ~20 m by Z 22 4.7

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