Abstract
Generally, traditional convolutional neural networks (CNN) models require a long training time and output high-dimensional features for content-based remote sensing image retrieval (CBRSIR). This paper aims to examine the retrieval performance of the MobileNets model and fine-tune it by changing the dimensions of the final fully connected layer to learn low dimensional representations for CBRSIR. Experimental results show that the MobileNets model achieves the best retrieval performance in term of retrieval accuracy and training speed, and the improvement of mean average precision is between 11.2% and 44.39% compared with the next best model ResNet152. Besides, 32-dimensional features of the fine-tuning MobileNet reach better retrieval performance than the original MobileNets and the principal component analysis method, and the maximum improvement of mean average precision is 11.56% and 9.8%, respectively. Overall, the MobileNets and the proposed fine-tuning models are simple, but they can indeed greatly improve retrieval performance compared with the commonly used CNN models.



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Acknowledgments
The authors would like to thank the PatternNet, NWPU and AID datasets for their open access. The authors also would like to thank the editors and the anonymous reviewers for their constructive comments and suggestions.
Funding
This work was supported in part by the National Natural Science Foundation of China under Grant 41,701,443 and Grant 41,801,308, and in part by the National Key Research and Development Program of China under Grant 2018YFB0505002.
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Communicated by: H. Babaie
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Hou, D., Miao, Z., Xing, H. et al. Exploiting low dimensional features from the MobileNets for remote sensing image retrieval. Earth Sci Inform 13, 1437–1443 (2020). https://doi.org/10.1007/s12145-020-00484-3
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DOI: https://doi.org/10.1007/s12145-020-00484-3