Spatial/Morphological measurement using close range photogrammetry- guidance from ISPRS V6
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Spatial/Morphological measurement using close range photogrammetry-
guidance from ISPRS V6
Jim Chandler1, Rene Wackrow1 and Dirk Rieke-Zapp2
1Loughborough University, UK2University of Berne, Switzerland
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
(with notable input from members of ISPRS Working Group V6)
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Overview
What can close range photogrammetry provide?
Why produce “tips”? Key points? An illustration!
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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What can close range photogrammetry provide?
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Italian Alps- 1990
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Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Antwerpen- 1991
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Black Ven Landslide- 1995 (1)
ARSF imagery March 2nd, 1995
Scale: 1:4,500
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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1995 (2)
Processed using digital photogrammetry Unix workstation (£15K, 1995)
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Automated measurement!– 1m resolution DEM-
1.6 million points in 10 hours
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Aboriginal rock art recording, 2004
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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Rock Art- Outputs
Digital Elevation Models (DEMs)
Accuracies- 2-3mmOrthophotos
Visualisation “fly-thru”
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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Northumberland and Durham Regional Rock Art project
9 of 42
• Partnership between English Heritage and the County Councils for Northumberland and Durham
• Loughborough University advising on the photogrammetry
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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Lessons learnt
Don’t underestimate volunteers Added political
benefits!
Technology and the volunteer Hi tech or low?
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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Why are “tips” necessary?
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Stated activity! Past experiences-
particularly postgraduates/ volunteers
Two sets!
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Who contributed?
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Primarily WG Officers
Also notable input from industry!including:
Marko Tuomien, Datapix Pty Ltd, Queensland, AustraliaStephen Bird, Fluvial Systems Research Inc, Whiterock, Canada
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Start simple- start small!
150 small format images of a river channel in Spain- I fly next week and my supervisor doesn’t know about photogrammetry!
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Common sense!
Familiarisation- techniques and how software works!
Start with: Small test area captured with perhaps two pairs Ideally use a pre-calibrated camera Establish abundant photo control- easy restitution plus checks
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Which camera?
All cameras have spatial measurement potential!
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Digital SLR!
Fixed or variable zoom lens?
Never purchase “top of the range”
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Camera calibration
Necessary for accurate spatial data acquisition!
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
What software? Matlab, PhotoModeler, IWitness, etc.
• camera focal length (f)• principal point offset (xP, yP)• radial lens distortion (K1, K2, K3)• tangential distortion (P1, P2)
-300
-250
-200
-150
-100
-50
00.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
(mic
rons
)
Radial Dist (mm)
Radial lens distortion
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Fieldwork/control
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Photo acquisition:• Infinity focus/f8• Fastest shutter speed possible/tripod• Obtain redundant imagery
Control Don’t skimp! Well distributed Withhold 20% and use as “checkpoints”
Visit site prior capture images “in pairs/triplets”
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Zhouqu- China 8th Aug. 2010
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
“Tips” document, freely available- more later!
Zhou Qu debris flow: Zhouqu mudslides death toll rose to 337 people, 1148 people missing
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Measurement potential of imagery!
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
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Measurement potential of imagery!
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011
Video fly-thru!
Gradient of debris slope! Next phase
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Conclusion
Prime purpose, raise awareness of photogrammetry and ISPRS Working Group V6: http://isprsv6.lboro.ac.uk/
Special Issue of the Photogrammetric Record: http://onlinelibrary.wiley.com/doi/10.1111/j.1477-9730.2010.00590.x/full
“Tips” document, providing simple guidance. Also some recent work/interests:
Potential of terrestrial imagery Potential of consumer grade digital cameras
Remote sensing- meeting industry needs with NERC expertise, 6th April 2011