Spatial generalization ability analysis of deep learning crop classification models

  • role: First author第一作者
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China

    Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China

    Beijing Engineering Research Center for Global Land Remote Sensing Products, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

    Institute of Remote Sensing Science and Engineering, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

  • Email:201921051175@mail.bnu.edu.cn
  • Introduction: E-mail 201921051175@mail.bnu.edu.cn
GE Shuang1234,  
  • role: Corresponding author通信作者
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China

    Beijing Engineering Research Center for Global Land Remote Sensing Products, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

    Institute of Remote Sensing Science and Engineering, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

  • Email:zhangjs@bnu.edu.cn
  • Introduction:E-mail zhangjs@bnu.edu.cn
ZHANG JinShui134*,  
  • Affiliation:

    Beijing Polytechnic College, Beijing 100042, China

ZHU Shuang5

ملخص

Timely and accurate global crop mapping is important for global food security assessment. However, existing crop classification models are often targeted at specific regions, and their performance in other regions has not been fully evaluated. This study determined the critical period of crop growth in different regions to realize the effective transfer of the model in large-scale regions, and the remote sensing data during these critical periods were filtered such that the same crop in different regions showed similar characteristics on these remote sensing images. This way helps the model achieve a better transfer effect. In this study, the MultiResUNet, SegNet, DeepLab V3+, and U-Net models were trained using data from Northeast China, and the optimal F1 value for summer corn recognition in the study areas in North China can reach more than 0.97. This research also analyzed the factors that affected the generalization ability of the model. The issues addressed in this article include (1) using existing crop distribution data products as the ground truth samples for model training to solve the problem of lack of training samples for the deep learning model. We compared and analyzed the applicability of the models trained using the US Cropland Data Layer and Northeast crop distribution data products in North China. (2) We compared the generalization performance of depth models with different architectures. (3) We compared and analyzed the influence of different data types on the generalization ability of the model. (4) We comparatively analyzed the impact of crop phenology changes on the generalization ability of the model. Results show that MultiResUNet has better generalization performance than other networks when the plot size in the training and test areas varies significantly However, the generalization ability of MultiResUNet alone still cannot completely overcome the adverse effect of the change in plot spatial morphology on model migration. The crop distribution data products in Northeast China, which are more similar to the agricultural landscape in North China, need to be used for deep learning model training to obtain more accurate information of maize distribution in North China. Compared with TOA data, we found that SR data are more conducive to the spatial migration of the model at the transcontinental scale. Therefore, SR data should be given priority in large-scale crop mapping. This research provides a useful discussion for large-scale crop mapping research using only local samples.

مفهوم

Model generalization;deep learning;SegNet;DeepLab V3+;U-Net;MultiResUNet;crop mapping

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