Preprints
https://doi.org/10.5194/essd-2021-34
https://doi.org/10.5194/essd-2021-34

  19 Feb 2021

19 Feb 2021

Review status: a revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

Developing a phenology- and pixel-based algorithm for mapping rapeseed at 10 m spatial resolution using multi-source data

Jichong Han, Zhao Zhang, Yuchuan Luo, Juan Cao, Liangliang Zhang, Jing Zhang, and Ziyue Li Jichong Han et al.
  • State Key Laboratory of Earth Surface Processes and Resource Ecology/MoE Key Laboratory of Environmental Change and Natural Hazards, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

Abstract. As a major oilseed crop, large-scale and high-resolution maps of rapeseed (Brassica napus L.) are critical for predicting annual production and ensuring global energy security. However, such free maps are still unavailable in large areas. We designed a new pixel- and phenology-based algorithm and produced a new data product for rapeseed planting area (2017–2019) over 33 countries at 10-m spatial resolution based on the multiple data. The product showed a good consistence (R2 = 0.88) with the official statistics (Food and Agricultural Organization of the United Nations, FAO) at national level. Rapeseed maps achieved at least 0.81 F1-scores of spatial consistency when comparing with the Cropland Data Layer (CDL) of America, Annual Crop Inventory (ACI) in Canada and Crop Map of England (CROME) in England. Moreover, their F1-scores ranged 0.84–0.92 based on the independent validation samples, implying a good consistency with ground truth. Furthermore, we found that rapeseed crop rotation is ≥2 years in almost all countries. Our derived maps with high accuracy suggest the robustness of pixel- and phenology-based algorithm in identifying rapeseed over large regions with various climate and landscapes. The derived rapeseed planting areas freely downloaded can be applied to predict rapeseed production and optimize planting structure. The product is available publicly at http://dx.doi.org/10.17632/ydf3m7pd4j.3 (Han et al., 2021).

Jichong Han et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-34', Anonymous Referee #1, 09 Mar 2021
    • AC1: 'Reply on RC1', zhao zhang, 20 Apr 2021
  • RC2: 'Comment on essd-2021-34', Anonymous Referee #2, 18 Mar 2021
    • AC2: 'Reply on RC2', zhao zhang, 20 Apr 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-34', Anonymous Referee #1, 09 Mar 2021
    • AC1: 'Reply on RC1', zhao zhang, 20 Apr 2021
  • RC2: 'Comment on essd-2021-34', Anonymous Referee #2, 18 Mar 2021
    • AC2: 'Reply on RC2', zhao zhang, 20 Apr 2021

Jichong Han et al.

Jichong Han et al.

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