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Remote Sens. 2017, 9(9), 904; https://doi.org/10.3390/rs9090904

A Small UAV Based Multi-Temporal Image Registration for Dynamic Agricultural Terrace Monitoring

1,2,†
,
1,2,†
,
1,2,†
,
1,3,* , 1,2,3,* , 1,3,* and 4
1
School of Information Science and Technology, Yunnan Normal University, Kunming 650500, China
2
Laboratory of Pattern Recognition and Artificial Intelligence, Yunnan Normal University, Kunming 650500, China
3
The Engineering Research Center of GIS Technology in Western China of Ministry of Education of China, Yunnan Normal University, Kunming 650500, China
4
Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 15 July 2017 / Revised: 21 August 2017 / Accepted: 21 August 2017 / Published: 31 August 2017
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Abstract

Terraces are the major land-use type of agriculture and support the main agricultural production in southeast and southwest China. However, due to smallholder farming, complex terrains, natural disasters and illegal land occupations, a light-weight and low cost dynamic monitoring of agricultural terraces has become a serious concern for smallholder production systems in the above area. In this work, we propose a small unmanned aerial vehicle (UAV) based multi-temporal image registration method that plays an important role in transforming multi-temporal images into one coordinate system and determines the effectiveness of the subsequent change detection for dynamic agricultural terrace monitoring. The proposed method consists of four steps: (i) guided image filtering based agricultural terrace image preprocessing, (ii) texture and geometric structure features extraction and combination, (iii) multi-feature guided point set registration, and (iv) feature points based image registration. We evaluated the performance of the proposed method by 20 pairs of aerial images captured from Longji and Yunhe terraces, China using a small UAV (the DJI Phantom 4 Pro), and also compared against four state-of-the-art methods where our method shows the best alignments in most cases. View Full-Text
Keywords: agricultural terrace; dynamic monitoring; multi-temporal; image registration; small UAVs agricultural terrace; dynamic monitoring; multi-temporal; image registration; small UAVs
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wei, Z.; Han, Y.; Li, M.; Yang, K.; Yang, Y.; Luo, Y.; Ong, S.-H. A Small UAV Based Multi-Temporal Image Registration for Dynamic Agricultural Terrace Monitoring. Remote Sens. 2017, 9, 904.

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