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Spatial/Morphological measurement using close range photogrammetry- guidance from ISPRS V6

Spatial/Morphological measurement using close range photogrammetry- guidance from ISPRS V6. (with notable input from members of ISPRS Working Group V6). Jim Chandler 1 , Rene Wackrow 1 and Dirk Rieke-Zapp 2 1 Loughborough University, UK 2 University of Berne, Switzerland

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Spatial/Morphological measurement using close range photogrammetry- guidance from ISPRS V6

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  1. Spatial/Morphological measurement using close range photogrammetry- guidance from ISPRS V6 (with notable input from members of ISPRS Working Group V6) Jim Chandler1, Rene Wackrow1 and Dirk Rieke-Zapp2 1Loughborough University, UK 2University of Berne, Switzerland j.h.chandler@lboro.ac.uk Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  2. 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

  3. What can close range photogrammetry provide? Italian Alps- 1990 Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  4. Antwerpen- 1991 Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  5. 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

  6. 1995 (2) • Automated measurement! • 1m resolution DEM- 1.6 million points in 10 hours Processed using digital photogrammetry Unix workstation (£15K, 1995) Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  7. Aboriginal rock art recording, 2004 Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  8. Rock Art- Outputs Digital Elevation Models (DEMs) Accuracies- 2-3mm Orthophotos Visualisation “fly-thru” Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  9. Northumberland and Durham Regional Rock Art project • 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

  10. Don’t underestimate volunteers Added political benefits! Lessons learnt • Technology and the volunteer • Hi tech or low? Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  11. Why are “tips” necessary? • Stated activity! • Past experiences-particularly postgraduates/ volunteers • Two sets! Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  12. Who contributed? • Primarily WG Officers • Also notable input from industry! including: • Marko Tuomien, Datapix Pty Ltd, Queensland, Australia • Stephen Bird, Fluvial Systems Research Inc, Whiterock, Canada Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  13. Start simple- start small! • 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 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

  14. Which camera? • Digital SLR! • Fixed or variable zoom lens? • Never purchase “top of the range” All cameras have spatial measurement potential! Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  15. Camera calibration • camera focal length (f) • principal point offset (xP, yP) • radial lens distortion (K1, K2, K3) • tangential distortion (P1, P2) • What software? • Matlab, PhotoModeler, IWitness, etc. Necessary for accurate spatial data acquisition! Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  16. Fieldwork/control • Visit site prior • capture images “in pairs/triplets” • 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” Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  17. Zhouqu- China 8th Aug. 2010 Zhou Qu debris flow: Zhouqu mudslides death toll rose to 337 people, 1148 people missing • “Tips” document, freely available- more later! Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  18. Measurement potential of imagery! Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  19. Measurement potential of imagery! • Video fly-thru! • Gradient of debris slope! • Next phase Remote sensing- meeting industry needs with NERC expertise, 6th April 2011

  20. 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

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