from imagery to map: digital photogrammetric technologies 13 th international scientific and...
TRANSCRIPT
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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