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Article

Assessing the Accuracy and Feasibility of Using Close-Range Photogrammetry to Measure Channelized Erosion with a Consumer-Grade Camera

1
Fredericton Research and Development Centre, Agriculture and Agri-Food Canada, Fredericton, NB E3B 4Z7, Canada
2
Faculty of Forestry & Environmental Management, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
3
Department of Soil Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
4
Institute for Spatial Information and Surveying Technology, Mainz University of Applied Sciences, 55128 Mainz, Germany
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(11), 1706; https://doi.org/10.3390/rs12111706
Received: 2 April 2020 / Revised: 23 May 2020 / Accepted: 25 May 2020 / Published: 27 May 2020
(This article belongs to the Special Issue Remote Sensing of Soil Erosion)
Water-induced channel is one of the main forms of soil erosion in cultivated fields. Channelized erosion is often measured by the volume of the channels. Traditionally, the measurements were conducted with rulers or measuring tapes. However, these traditional methods are generally time- and labor-consuming and can cause soil surface disturbance. Close-range photogrammetry with a Consumer-Grade Camera (CGC-CRP) provides an alternative way of measuring channel volume and can overcome limitations of traditional methods and provides much higher spatial resolution. However, quantitative information on the accuracy of this technique is rare. In this study, the accuracy of the CGC-CRP method under different settings were examined with an in-house experiment and validated with a field experiment. In the in-house experiment, a wood board surface with Artificial Channels (AC) of different shapes, orientations, and sizes were built. These ACs were surveyed using the CGC-CRP method with a series of settings of shooting angles and image overlapping rates. Selected cross-sectional areas were extracted to compare against manual measurements to assess the absolute and relative errors of the CGC-CRP method. The applicability of the CGC-CRP method with different settings was evaluated by comparing time consumption and the size of detection areas. The results indicated that in order to maintain an acceptable accuracy level, the image overlapping rate should be ≥70%, and the shooting angle should be in the range of 60° to 80°. For the channel shape, the accuracy for V-channel was ~15% higher than that for U-channel. For the U-channel, the impact of the channel orientation on the accuracy was not significant when the shooting angle was relatively high, whereas for the V-channel, the vertically oriented channel had higher accuracy than horizontal or angle channels. Last, channel size did not strongly affect accuracy when the channel was vertically orientated, and the shooting angle and image overlapping rate were set in the optimum ranges. However, when the shooting angle or image overlapping rate was low, or when the channel was angled or horizontally orientated, the accuracy was lower with larger channel size. In the field experiment, under the optimum camera setting, the error for the ten cross-sectional areas was about 1.6%. This result suggests that the CGC-CRP method is promising in volumetric assessment of rill and gully erosion. The quantitative information on the accuracy provided in this study can help researchers to select the setting of CGC-CRP methods to achieve their required accuracy level. View Full-Text
Keywords: consumer-grade camera; close-range photogrammetry; rill erosion; gully erosion; Digital Elevation Model (DEM) consumer-grade camera; close-range photogrammetry; rill erosion; gully erosion; Digital Elevation Model (DEM)
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MDPI and ACS Style

Zheng, F.; Wackrow, R.; Meng, F.-R.; Lobb, D.; Li, S. Assessing the Accuracy and Feasibility of Using Close-Range Photogrammetry to Measure Channelized Erosion with a Consumer-Grade Camera. Remote Sens. 2020, 12, 1706. https://doi.org/10.3390/rs12111706

AMA Style

Zheng F, Wackrow R, Meng F-R, Lobb D, Li S. Assessing the Accuracy and Feasibility of Using Close-Range Photogrammetry to Measure Channelized Erosion with a Consumer-Grade Camera. Remote Sensing. 2020; 12(11):1706. https://doi.org/10.3390/rs12111706

Chicago/Turabian Style

Zheng, Fangzhou; Wackrow, Rene; Meng, Fan-Rui; Lobb, David; Li, Sheng. 2020. "Assessing the Accuracy and Feasibility of Using Close-Range Photogrammetry to Measure Channelized Erosion with a Consumer-Grade Camera" Remote Sens. 12, no. 11: 1706. https://doi.org/10.3390/rs12111706

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