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Open AccessArticle

Automated Mapping of Typical Cropland Strips in the North China Plain Using Small Unmanned Aircraft Systems (sUAS) Photogrammetry

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Institute of Land Reclamation and Ecological Restoration, Department of Surveying and Land Use, China University of Mining and Technology-Beijing, Beijing 100083, China
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Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
3
Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA 24061, USA
4
School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(20), 2343; https://doi.org/10.3390/rs11202343
Received: 12 May 2019 / Revised: 16 July 2019 / Accepted: 16 July 2019 / Published: 10 October 2019
(This article belongs to the Section Remote Sensing in Agriculture and Vegetation)
Accurate mapping of agricultural fields is needed for many purposes, including irrigation decisions and cadastral management. This paper is concerned with the automated mapping of cropland strips that are common in the North China Plain. These strips are commonly 3–8 m in width and 50–300 m in length, and are separated by small ridges that assist with irrigation. Conventional surveying methods are labor-intensive and time-consuming for this application, and only limited performance is possible with very high resolution satellite images. Small Unmanned Aircraft System (sUAS) images could provide an alternative approach to ridge detection and strip mapping. This paper presents a novel method for detecting cropland strips, utilizing centimeter spatial resolution imagery captured by sUAS flying at low altitude (60 m). Using digital surface models (DSM) and ortho-rectified imagery from sUAS data, this method extracts candidate ridge locations by surface roughness segmentation in combination with geometric constraints. This method then exploits vegetation removal and morphological operations to refine candidate ridge elements, leading to polyline-based representations of cropland strip boundaries. This procedure has been tested using sUAS data from four typical cropland plots located approximately 60 km west of Jinan, China. The plots contained early winter wheat. The results indicated an ability to detect ridges with comparatively high recall and precision (96.8% and 95.4%, respectively). Cropland strips were extracted with over 98.9% agreement relative to ground truth, with kappa coefficients over 97.4%. To our knowledge, this method is the first to attempt cropland strip mapping using centimeter spatial resolution sUAS images. These results have demonstrated that sUAS mapping is a viable approach for data collection to assist in agricultural land management in the North China Plain. View Full-Text
Keywords: automated extraction; ridge detection; strip mapping; small unmanned aircraft systems (sUAS); surface roughness; North China Plain automated extraction; ridge detection; strip mapping; small unmanned aircraft systems (sUAS); surface roughness; North China Plain
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MDPI and ACS Style

Zhang, J.; Zhao, Y.; Abbott, A.L.; Wynne, R.H.; Hu, Z.; Zou, Y.; Tian, S. Automated Mapping of Typical Cropland Strips in the North China Plain Using Small Unmanned Aircraft Systems (sUAS) Photogrammetry. Remote Sens. 2019, 11, 2343.

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