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Winter wheat planting area extraction over wide area using vegetation red edge information of multi-temporal Sentinel-2 images

  • role： First author第一作者
  • Affiliation：

    Chinese Academy of Surveying and Mapping, Beijing 100036, China

  • Email：1004490281@qq.com
  • Introduction：田欣媛，研究方向为遥感信息处理与分析。E-mail： 1004490281@qq.com
TIAN Xinyuan1,  
  • role： Corresponding author通信作者
  • Affiliation：

    Chinese Academy of Surveying and Mapping, Beijing 100036, China

  • Email：yhzhang@casm.ac.cn
  • Introduction：张永红，研究方向为遥感信息提取与分析以及SAＲ干涉测量形变监测。E-mail： yhzhang@casm.ac.cn
ZHANG Yonghong1*,  
  • Affiliation：

    Chinese Academy of Surveying and Mapping, Beijing 100036, China

    College of Geodesy and Geomatics, Shangdong University of Science and Technology, Qingdao 266590, China

LIU Rui12,  
  • Affiliation：

    Chinese Academy of Surveying and Mapping, Beijing 100036, China

WEI Jujie1

resumen

As the main grain crop in China, winter wheat planting area has great inter-annual variations. Remote Sensing (RS) technology is the most effective method to obtain the planting area data of winter wheat over wide areas. The Normalized Difference Vegetation Index (NDVI) parameter derived from multi-temporal RS images with medium and low resolution, such as MODIS imagery, is frequently used for such purpose. But the accuracy of obtained winter wheat planting area is usually unsatisfactory due to the limited spatial resolution of the used RS images. Sentinel-2A and Sentine-2B, which were launched in 2015 and 2017 respectively, are currently the only spaceborne sensors capable of acquiring images in three red-edge spectral bands with meter-level spatial resolution. Red-edge bands have great potential in discriminating vegetation types and evaluating vegetation health condition, because these bands are sensitive to the chlorophyll and the nitrogen contents of vegetation. However, there are few studies on winter wheat extraction over wide area using the red-edge bands of Sentinel-2 data. In this paper, a wide-area winter wheat extraction method based on the Red-Edge Position Index (REPI) and the NDVI data derived from multi-temporal Sentinel-2 images is proposed, which is then applied to extract the winter wheat planting area in the Beijing-Tianjin-Hebei region for the year of 2020. Firstly, the temporal REPI and NDVI are extracted from Sentinel-2 data. Secondly, the key temporal phases for discriminating winter wheat are studied, and the decision rules based on temporal REPI and NDVI features for winter wheat discrimination are constructed. Finally, the winter wheat planting area in the Beijin-Tianjin-Hebei region in 2020 is extracted using the constructed decision rules. The extracted winter wheat area is validated by two kinds of reference data. It shows an error of -2.57% when compared with the winter wheat planting area data published by the National Bureau of Statistics. Additionally, the overall accuracy of the extracted winter wheat area is 94.24% and the Kappa coefficient is 0.88 in comparison with the visual interpretation results of Google Earth high-resolution images. The conclusions are: (1) REPI changes with the change of chlorophyll concentration during the growth period of winter wheat, and gradually increases with the growth of winter wheat seedlings after sowing period, until reaching the first peak (about 722 nm) at the emergence stage (November). During the overwintering period, it falls below 715 nm. The second peak is reached at heading stage (April-May), with the corresponding value greater than 730 nm. The REPI value in the mature stage drops below 720 nm. Especially, the REPI at heading stage provides excellent separability between winter wheat and woodland, while NDVI has a serious commission error when distinguishing winter wheat from woodland. (2) It can not achieve satisfactory result when either parameter (REPI or NDVI) of single date is used to extract winter wheat over wide areas. However, the decision tree classifier constructed based on the combination of REPI and NDVI parameters derived from multi-temporal Sentinel-2 data can extract winter wheat area with very high accuracy over wide areas, because other land cover types can be well excluded by the specific features presented by either REPI or NDVI of the key temporal phases, thus the effect of “different cover types with similar pectrum” associate with wide-area classification can be largely mitigated. This research demonstrates the significance of the red-edge bands of Sentinel-2 in discriminating winter wheat of wide-area.

palabra clave

winter wheat;area extraction;wide-area;Sentinel-2;REPI;multi-temporal images

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