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

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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

Transcript of From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and...

Page 1: From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric.

13th International Scientific and Technical Conference

From Imagery to Map: Digital Photogrammetric Technologies

Scientific UAS training for mapping

Smirnov AlexeyManager of Technical Support Department, Racurs

September 2013, Fontainebleau, France

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Scientific training area MIIGAiK

Department of photogrammetry

June 2013

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UAS Models

GeoScan 101Gatewing X100

Ptero-E5

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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

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Technological workflow

Orthophoto control

DEMAerotriangulation

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Objects

Area 4 sq.km. Road 5 km.

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Testing with accurate centers (Ptero)

GPS position adjustment accuracy (using Obninsk base station) is 6 cm

*

* By GNSS+ company

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Spatial offset

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

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Time offset

Nikon D800NovAtel OEM615

Synchronization problem is caused by two-curtain shutter

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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

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Adjustment result by centers and GCPs

Errors

Projection Centers~30 cm by XY

Check points

~16 cm by XY

~16 cm by Z

~16 cm by Z

GCD – 2 cm

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Orthophoto quality

GSD – 2 cm

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Orthophoto accuracy (relative)

Positional accuracy Δ ~ 18 cm

Vectors from stereo of DiMAC survey

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Orthophoto accuracy (absolute)

E abs

Δmin. – 6 cm

Δmax. – 16 cm

Accuracy corresponds to scale 1:2000

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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

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Small test area (Ptero)

E abs

Δmin. – 2 cm

Δmax. – 7 cm

Accuracy corresponds to scale 1:1000

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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

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Small test area (GeoScan)

E abs

Δmin. – 13 cm

Δmax. – 23 cm

Accuracy corresponds to scale 1:2000

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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

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Small test area (Gatewing)

E abs

Δmin. – 14 cm

Δmax. – 22 cm

Accuracy corresponds to scale 1:2000

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Difference

Models Camera

altitude, m

Number of

frames

Area,sq.m.

Centers accuracy

Orthophoto accuracy (absolute)

,cm

GSD,cm/pix

Ptero-E5

Nikon D800

(calibrated)

~250

97 280

~17 cm by XY

~10 cm by Z

72.2

GeoScan 101

Sony NEX-5R

~200

38 800

~3 m by XY

~16 m by Z

237.2

Gatewing X100 Ricoh-GR

~150

130 360

~7.5 m by XY

~20 m by Z

22

4.7

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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

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Thank you for attention