{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T13:46:27Z","timestamp":1765547187162,"version":"build-2065373602"},"reference-count":61,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2024,2,4]],"date-time":"2024-02-04T00:00:00Z","timestamp":1707004800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["62376225","62006188","2021QCYRC4-50","2452022341"],"award-info":[{"award-number":["62376225","62006188","2021QCYRC4-50","2452022341"]}]},{"name":"QinChuangyuan High-Level Innovation and Entrepreneurship Talent Program of Shaanxi","award":["62376225","62006188","2021QCYRC4-50","2452022341"],"award-info":[{"award-number":["62376225","62006188","2021QCYRC4-50","2452022341"]}]},{"name":"Chinese Universities Scientific Fund","award":["62376225","62006188","2021QCYRC4-50","2452022341"],"award-info":[{"award-number":["62376225","62006188","2021QCYRC4-50","2452022341"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Hyperspectral image (HSI) classification plays a key role in the field of earth observation missions. Recently, transformer-based approaches have been widely used for HSI classification due to their ability to model long-range sequences. However, these methods face two main challenges. First, they treat HSI as linear vectors, disregarding their 3D attributes and spatial structure. Second, the repeated concatenation of encoders leads to information loss and gradient vanishing. To overcome these challenges, we propose a new solution called the multi-level feature extraction network (MLFEN). MLFEN consists of two sub-networks: the hybrid convolutional attention module (HCAM) and the enhanced dense vision transformer (EDVT). HCAM incorporates a band shift strategy to eliminate the edge effect of convolution and utilizes hybrid convolutional blocks to capture the 3D properties and spatial structure of HSI. Additionally, an attention module is introduced to identify strongly discriminative features. EDVT reconfigures the organization of original encoders by incorporating dense connections and adaptive feature fusion components, enabling faster propagation of information and mitigating the problem of gradient vanishing. Furthermore, we propose a novel sparse loss function to better fit the data distribution. Extensive experiments conducted on three public datasets demonstrate the significant advancements achieved by MLFEN.<\/jats:p>","DOI":"10.3390\/rs16030590","type":"journal-article","created":{"date-parts":[[2024,2,5]],"date-time":"2024-02-05T09:31:58Z","timestamp":1707125518000},"page":"590","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Multi-Level Feature Extraction Networks for Hyperspectral Image Classification"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-9130-7444","authenticated-orcid":false,"given":"Shaoyi","family":"Fang","sequence":"first","affiliation":[{"name":"School of Information Engineering, Northwest A&F University, Xi\u2019an 712100, China"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-5649-7538","authenticated-orcid":false,"given":"Xinyu","family":"Li","sequence":"additional","affiliation":[{"name":"School of Information Engineering, Northwest A&F University, Xi\u2019an 712100, China"}]},{"given":"Shimao","family":"Tian","sequence":"additional","affiliation":[{"name":"School of Information Engineering, Northwest A&F University, Xi\u2019an 712100, China"}]},{"given":"Weihao","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Information Engineering, Northwest A&F University, Xi\u2019an 712100, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3408-1932","authenticated-orcid":false,"given":"Erlei","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Information Engineering, Northwest A&F University, Xi\u2019an 712100, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1740","DOI":"10.1520\/JTE20220073","article-title":"Rapeseed Storage Quality Detection Using Hyperspectral Image Technology-An Application for Future Smart Cities","volume":"51","author":"Liao","year":"2023","journal-title":"J. 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