Lecturer in Engineering Surveying
School of Civil & Building Engineering
Loughborough University, UK
Lecturer in Engineering Surveying
School of Civil & Building Engineering
Loughborough University, UK
Turbulent flows and riparian vegetation induced drag for river flooding
- In order to mitigate flood risk, it is essential that a sufficient understanding of flow characteristics in rivers should be achieved, to enable accurate models and therefore accurate estimation of water level to provide accurate flood warnings and inundation maps of towns and cities. This EPSRC funded project (EP/K004891/1) in collaboration with Prof. Koji Shiono and Prof. Jim Chandler is therefore to study the effects of riparian vegetation through laboratory experiments in order to mitigate flood risk and to provide an appropriate guidance on the management of riparian vegetation. The experiments will be conducted at Loughborough University and will involve measuring riparian vegetation drag force, turbulence, bed friction, and water surface variation with a measuring drag device, Acoustic Doppler Velocimetry (ADV), a pitot tube, a Preston tube, a 3-D digital scanner, and Photogrammetry. These measured flow parameters will be used to investigate effects on the key parameters such as drag coefficient, flow resistance and water level for the management of riparian vegetation and flood risk assessment.
Recovering the original, sharp image by developing efficient and reliable algorithms for image deblurring
- Ph.D. student Till Sieberth is investigating the potential of developing automatic processing algorithms to detect and quantify image blur.
Channels in agricultural landscapes and their roles in hydrology, soil erosion and nutrient losses in potato production systems of Eastern Canada
- Rene is working in collaboration with the PI Dr Li Chen at the Potato Research Centre, Agriculture and Agri Food Canada to help to fill the knowledge gap on the initiation and development of channels and the impacts of channels on hydrology, soil erosion and nutrient transportation at the plot-, field- and watershed-scales. As part of the project, photogrammetric data will be used to characterise the effect of rainfall and snowmelt erosion for potato production systems of Eastern Canada.
Large scale additive manufacturing for construction - Rene is working in collaboration with
Dr R. Buswell to investigate the accuracy in the object space of a freeform construction machine situated in the Civil & Building Engineering Laboratory at Loughborough University. A laser scanning approach will be used to compare a 'printed' model with the original design data.
Initial scan (30 MB)
Difference object (27 MB)
Direct exterior orientation determination in close-range photogrammetry for cultural heritage recording
Rene co-supervised former Ph.D. student Dr. Melanie Kirchhoefer. In this project a low-cost photogrammetric recording system was developed that is capable of direct exterior orientation determination. The system comprises a consumer-grade digital camera, a small-size orientation sensor and a GPS receiver. The achievable absolute and relative accuracy was assessed during performance tests at a test field and two cultural heritage sites. It was demonstrated that the system is usable for medium accuracy (20 cm) cultural heritage recording, potentially reducing cost by allowing non-specialists to become involved.
NERC Project: Capturing all fresh information on the Zhouqu landslide disaster, in the Gansu province of China that took place on the 8th August 2010 - Rene was working in collaboration with the PI Dr Tom Dijkstra, Co-I Professor Jim Chandler and Dr Enoc Sanz Ablanedo at Loughborough in conjunction with the British Geological Survey and the University of Portsmouth to adopt a scientific approach to collect data, verify their robustness, make impartial observations and develop reliable process models which will be essential to develop appropriate mitigation strategies for the future. Images of the area were used to extract digital elevation models and orthophotos which were initially used for a mapping programme.
Zhouqu DEM+Orthophoto (25 MB)
Comparing low cost photogrammetry and laser scanning for accurate spatial measurement and representation of building fabric - Rene is PI on a RICS funded project (November 2009 - November 2010) to compare the accuracy achievable using laser scanning and photogrammetry for close range surveying and monitoring of structures and building fabrics. The study will answer the question: "What is the most suitable technique for specific measurement tasks in the construction environment in terms of data acquisition, data processing and costs effectiveness?" This funded project is being conducted through collaboration with Jim Chandler at Loughborough.
Car crash investigation
- a collaboration (Rene and Jim Chandler) with the Crash Investigation Manager, Rob Newton, at the Transport Safety Research Centre, Loughborough University has been established to investigate the effect of side and frontal impacts on cars. A terrestrial laser scanner is being used to quantify deformations that have occurred by comparing crashed areas with unaffected zones.
Difference image (17 MB)
Spatial measurement with consumer grade digital cameras - Rene has developed the potential of consumer grade digital cameras for accurate spatial measurement in his PhD Thesis. An approach is introduced to assess camera stability based on comparing the accuracy in the reconstructed object space. This study also identified residual systematic error surfaces and a methodology that uses a mildly convergent image configuration was developed, which removes these systematic errors. This methodology can reduce the need for an accurate lens model and effectively increase the accuracy achievable with non-metric digital sensors.
Journal Papers - Academic Journals
KIRCHHÖFER, M.K., CHANDLER, J.H., WACKROW, R. AND BRYAN, P. (2012). Direct exterior orientation determination for a low-cost heritage recording system. Photogrammetric Record, 27(140), 443-461.
Sanz-Ablanedo E., CHANDLER, J.H. AND WACKROW, R. (2012). Parameterising internal camera geometry with focusing distance. Photogrammetric Record, , 27(138), 210-226.
WALSTRA, J., CHANDLER, J.H., DIXON, N. AND WACKROW, R. (2011). Evaluation of the controls affecting the quality of spatial data derived from historical aerial photographs. Earth Surface Processes and Landforms, 36(7), 853-863.
WACKROW, R. AND CHANDLER, J.H. (2011). Minimising systematic error surfaces in digital elevation models using oblique convergent imagery. Photogrammetric Record, 26(133), 16-31.
WACKROW, R. (2011). Digital Camera Calibration. EuroSDR Official Publication No. 55. Photogrammetric Record, 26(135).
WACKROW, R. AND CHANDLER, J.H. (2008). A convergent image configuration for DEM extraction that minimises the systematic effects caused by an inaccurate lens model. Photogrammetric Record, 23(121), 6-18.
WACKROW, R. and BARTELS, M. (2007). RSPSoc Annual Conference 2007: Challenges for earth observation - scientific, technical and commercial. The Photogrammetric Record, 22 (120), 356 - 359.
WACKROW, R., CHANDLER, J.H. AND BRYAN, P. (2007). Geometric consistency and stability of consumer-grade digital cameras for accurate spatial measurement. Photogrammetric Record, 22(118), 121-134.
Selected Conference Contributions - Refereed
KIRCHHÖFER, M.K., CHANDLER, J.H. AND WACKROW, R. (2011). Cultural heritage recording utilising low-cost close-range photogrammetry. Proceedings of CIPA 23rd International Symposium, 12 – 16 September 2011, Prague, Czech Republic, 8 pages [on CD-ROM].
WACKROW, R., CHANDLER, J.H., DIJKSTRA, T., SANZ-ABLANEDO, E. AND XINGMIN, M. (2011). Incidental terrestrial imagery for post disaster spatial data capture of debris flows. Geomorphometry 2011 Conference Proceedings in: Geomorphometry 2011, Edited by T. Hengl, I.S. Evans, J.P. Wilson and M. Gould, 7-11 September 2011, ESRI Campus, Redlands, USA: pp.11-14.
Lim, S., Buswell, R.A., Le, T.T., WACKROW, R., Austin, S.A., Gibb, A.G.F. AND Thorpe, A. (2011). Development of a viable Concrete Printing process. Proceedings of the 28th International Symposium on Automation and Robotics in Construction (ISARC2011); Seoul, South Korea, 29th June - 2nd July 2011, 665-670.
KIRCHHÖFER, M.K., CHANDLER, J.H. AND WACKROW, R. (2010). Testing and application of a low-cost photogrammetric recording system suitable for cultural heritage recording. Proceedings of RSPSoc and Irish Earth Observation Symposium; University College Cork, 1st-3rd September 2010, 330-337 [Also on CD-ROM].
WACKROW, R., CHANDLER, J.H. AND GARDNER, T. (2008). Minimising systematic errors in DEMs caused by an inaccurate lens model. The Inernational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, xxxvii(B5), CHEN Jun, JIANG Jie, Hans-Gerd MAAS, International Society for Photogrammetry and Remote Sensing, xxi Congress, Beijing, 3rd July 2008, 1-6, [Also on CD-ROM].
CHANDLER, J.H., WACKROW, R., SUN, X., SHIONO, K. AND RAMESHWAREN, P. (2008). Measuring a dynamic and flooding river surface by close range digital photogrammetry. The Inernational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, xxxvii(B8), CHEN Jun, JIANG Jie, Hans-Gerd MAAS, International Society for Photogrammetry and Remote Sensing, xxi Congress, Beijing, 3rd July 2008, 211-216, [Also on CD-ROM].
WACKROW, R. and CHANDLER, J.H. (2007). A Convergent image configuration for DEM extraction that minimises the systematic effects caused by an innaccurate lens model. Remote Sensing and Photogrammety Society, Annual Conference (RSPSoc 2007), Newcastle upon Tyne, 11th September 2007, 3.
Other Reports and Contributions
WACKROW, R. and BRYAN, P. (2009). Investigation of the performance of various camera calibration software packages. Report Department Research Series, English Heritage.
International Society for Photogrammetry and Remote Sensing (ISPRS)
ISPRS Working Group V/6: Natural morphology at close range
Jim Chandler's academic interests
Camera calibration files for LPS/OrthoBase Professional
2 Full-time PhD studentships
The Department of Geography has secured 2 PhD studentships aligned with Loughborough University's strategic research investment in 'Water Resources' and 'Autonomous Vehicles'. Applications are now invited from exceptionally well qualified students who wish to embark on a full-time research degree programme commencing in Autumn Term 2013. Further details: studentship, contact: Dr Rene Wackrow
For more details contact me by e-mail, please!