From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and...
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Transcript of From Imagery to Map: Digital Photogrammetric Technologies 13 th International Scientific and...
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
Scientific training area MIIGAiK
Department of photogrammetry
June 2013
UAS Models
GeoScan 101Gatewing X100
Ptero-E5
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
Technological workflow
Orthophoto control
DEMAerotriangulation
Objects
Area 4 sq.km. Road 5 km.
Testing with accurate centers (Ptero)
GPS position adjustment accuracy (using Obninsk base station) is 6 cm
*
* By GNSS+ company
Spatial offset
Offset vector : x=0.047 m, y=0.110 m, z=0.194 m
Time offset
Nikon D800NovAtel OEM615
Synchronization problem is caused by two-curtain shutter
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
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
Orthophoto quality
GSD – 2 cm
Orthophoto accuracy (relative)
Positional accuracy Δ ~ 18 cm
Vectors from stereo of DiMAC survey
Orthophoto accuracy (absolute)
E abs
Δmin. – 6 cm
Δmax. – 16 cm
Accuracy corresponds to scale 1:2000
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
Small test area (Ptero)
E abs
Δmin. – 2 cm
Δmax. – 7 cm
Accuracy corresponds to scale 1:1000
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
Small test area (GeoScan)
E abs
Δmin. – 13 cm
Δmax. – 23 cm
Accuracy corresponds to scale 1:2000
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
Small test area (Gatewing)
E abs
Δmin. – 14 cm
Δmax. – 22 cm
Accuracy corresponds to scale 1:2000
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
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
Thank you for attention