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Article

A Semi-Automated Object-Based Gully Networks Detection Using Different Machine Learning Models: A Case Study of Bowen Catchment, Queensland, Australia

1
Department of Remote Sensing and GIS, University of Tabriz, Tabriz 5166616471, Iran
2
Mountain Societies Research Institute, University of Central Asia, Khorog 736000, Tajikistan
3
Sustainability Research Centre, University of the Sunshine Coast, Sunshine Coast, QLD 4556, Australia
4
Department of Geoinformatics-Z _GIS, University of Salzburg, 5020 Salzburg, Austria
5
School of Physical Sciences, University of Adelaide, Adelaide 5005, Australia
6
Faculty of Natural Resources and Marine Sciences, Tarbiat Modares Unviversity (TMU), Tehran 46414-356, Iran
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(22), 4893; https://doi.org/10.3390/s19224893
Received: 20 September 2019 / Revised: 5 November 2019 / Accepted: 6 November 2019 / Published: 9 November 2019
Gully erosion is a dominant source of sediment and particulates to the Great Barrier Reef (GBR) World Heritage area. We selected the Bowen catchment, a tributary of the Burdekin Basin, as our area of study; the region is associated with a high density of gully networks. We aimed to use a semi-automated object-based gully networks detection process using a combination of multi-source and multi-scale remote sensing and ground-based data. An advanced approach was employed by integrating geographic object-based image analysis (GEOBIA) with current machine learning (ML) models. These included artificial neural networks (ANN), support vector machines (SVM), and random forests (RF), and an ensemble ML model of stacking to deal with the spatial scaling problem in gully networks detection. Spectral indices such as the normalized difference vegetation index (NDVI) and topographic conditioning factors, such as elevation, slope, aspect, topographic wetness index (TWI), slope length (SL), and curvature, were generated from Sentinel 2A images and the ALOS 12-m digital elevation model (DEM), respectively. For image segmentation, the ESP2 tool was used to obtain three optimal scale factors. On using object pureness index (OPI), object matching index (OMI), and object fitness index (OFI), the accuracy of each scale in image segmentation was evaluated. The scale parameter of 45 with OFI of 0.94, which is a combination of OPI and OMI indices, proved to be the optimal scale parameter for image segmentation. Furthermore, segmented objects based on scale 45 were overlaid with 70% and 30% of a prepared gully inventory map to select the ML models’ training and testing objects, respectively. The quantitative accuracy assessment methods of Precision, Recall, and an F1 measure were used to evaluate the model’s performance. Integration of GEOBIA with the stacking model using a scale of 45 resulted in the highest accuracy in detection of gully networks with an F1 measure value of 0.89. Here, we conclude that the adoption of optimal scale object definition in the GEOBIA and application of the ensemble stacking of ML models resulted in higher accuracy in the detection of gully networks. View Full-Text
Keywords: geographic object-based image analysis (GEOBIA); gully erosion; optimal scale detection; stacking model; Bowen catchment geographic object-based image analysis (GEOBIA); gully erosion; optimal scale detection; stacking model; Bowen catchment
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MDPI and ACS Style

Shahabi, H.; Jarihani, B.; Tavakkoli Piralilou, S.; Chittleborough, D.; Avand, M.; Ghorbanzadeh, O. A Semi-Automated Object-Based Gully Networks Detection Using Different Machine Learning Models: A Case Study of Bowen Catchment, Queensland, Australia. Sensors 2019, 19, 4893. https://doi.org/10.3390/s19224893

AMA Style

Shahabi H, Jarihani B, Tavakkoli Piralilou S, Chittleborough D, Avand M, Ghorbanzadeh O. A Semi-Automated Object-Based Gully Networks Detection Using Different Machine Learning Models: A Case Study of Bowen Catchment, Queensland, Australia. Sensors. 2019; 19(22):4893. https://doi.org/10.3390/s19224893

Chicago/Turabian Style

Shahabi, Hejar; Jarihani, Ben; Tavakkoli Piralilou, Sepideh; Chittleborough, David; Avand, Mohammadtaghi; Ghorbanzadeh, Omid. 2019. "A Semi-Automated Object-Based Gully Networks Detection Using Different Machine Learning Models: A Case Study of Bowen Catchment, Queensland, Australia" Sensors 19, no. 22: 4893. https://doi.org/10.3390/s19224893

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