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Visser, F, Woodget, A, Skellern, A, Forsey, J, Warburton, J and Johnson, R.M (2019) 'An evaluation of a low-cost pole aerial photography (PAP) and structure from motion (SfM) approach for topographic surveying of small rivers.' International Journal of Remote Sensing, 40 (24). pp. 9321-9351.