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高光谱相机赋能精准农业:无人机搭载助力小麦叶片氮含量高效监测

  • 2026-07-04 02:49:47
高光谱相机赋能精准农业:无人机搭载助力小麦叶片氮含量高效监测

在全球农业向可持续发展转型的背景下,小麦作为支撑 22 亿人口主食需求的重要作物,其生长状态直接关系到粮食安全与生态平衡。氮素作为影响小麦生长和产量形成的关键因素,科学调控氮肥施用是提升资源利用率、减少环境压力的核心环节。而叶片氮含量(LNC)作为反映作物氮素供需平衡的核心指标,其快速、精准监测成为精准农业发展的重要需求。传统监测方法受限于效率与覆盖范围,难以满足大规模田间管理需求,而无人机高光谱遥感技术的兴起,为这一难题提供了新的解决方案 —— 杭州彩谱科技FS-60C高光谱相机,凭借其优异的性能表现,成为解锁小麦氮素精准监测的关键设备。

01/构建高效检测技术体系

江苏大学研究团队在Jiangsu Agricultural Expo Park开展的小麦氮素监测研究中,采用大疆M300RTK无人机搭载彩谱FS-60C高光谱相机,构建了从数据采集到精准预测的完整技术流程。该研究覆盖小麦拔节期、抽穗期、开花期和灌浆期四个关键生育阶段,通过6次飞行采集高光谱数据,为后续分析提供了丰富的基础素材。

FS-60C 高光谱相机具备突出的技术参数优势,能够捕获391.43–1009.56nm 范围内的300个光谱波段,最终光谱分辨率达2.5 nm,可细致捕捉小麦叶片在不同氮素水平下的光谱响应差异。获取的高光谱数据空间分辨率为每像素0.017m,相机能够精准记录田间小麦的光谱信息,为后续的LNC反演提供高质量数据支撑。在数据采集过程中,FS-60C通过与地面标准白板校准、太阳角度误差校正等流程配合,有效降低了外界环境对数据质量的影响,确保了光谱数据的稳定性与可靠性。

02/彩谱FS-60C支撑精准预测

研究中,基于FS-60C获取的高光谱数据,团队进行了系统的预处理与分析。通过一阶导数处理消除基线漂移和杂散光干扰,凸显了700–750 nm波段的光谱变异特征,而这一波段与小麦 LNC 的相关性尤为密切。后续的特征分析表明,FS-60C捕获的光谱数据中,包含了大量与氮素含量相关的关键信息,这些信息为模型构建提供了坚实基础。

为实现LNC的精准预测,研究团队构建了融合空间注意力机制(SAM)的 1D-CNN 模型(SAM-1D-CNN),并与传统化学计量模型(PLSR、SVR)及其他神经网络模型(1D-CNN、1D-ResNet)进行对比。结果显示,基于FS-60C高光谱数据的SAM-1D-CNN模型展现出良好的预测性能,其决定系数(R²)达到0.8415,交叉验证均方根误差(RMSECV)为3.7517 g/kg,平均绝对百分比误差(MAPE)为9.3544%。这一结果的达成,离不开FS-60C提供的高分辨率、高稳定性光谱数据 ——丰富的光谱维度与精准的光谱信息,为模型有效提取氮素敏感特征、抑制冗余干扰提供了关键支撑。

值得关注的是,基于FS-60C数据生成的小麦LNC空间分布图,与田间实际氮素施用梯度高度吻合。在过量施肥(N4)与适宜施肥(N3)区域,LNC值稳定在40–50 g/kg,直观反映了氮肥边际效应递减现象;而从N2到N0区域,LNC呈现梯度递减趋势,且不同生育阶段的LNC变化符合小麦生长规律,充分验证了该技术体系的实用性。

03/助力可持续农业发展

作为精准农业领域的重要技术装备,彩谱FS-60C高光谱相机凭借出色的光谱捕捉能力,与SAM-1D-CNN等先进算法深度融合,搭建起从高光谱数据采集到作物营养状态反演的完整技术链路,为作物营养监测提供全新范式。其获取的高分辨率光谱数据,能精准捕捉与作物氮素相关的光谱特征,助力模型高效提取关键信息,有效提升监测的精准度与稳定性。未来,随着技术的持续优化和应用场景的不断拓展,FS-60C可进一步延伸至玉米、水稻等更多作物,覆盖从苗期到收获期的全生育阶段精准管理。这一技术将持续为农业可持续发展注入动力,推动传统经验驱动的农业模式,向数据驱动的精准农业加速转型。

(论文原文可通过www.elsevier.com/locate/compag搜索《Integration of spatial attention mechanism into 1D-CNN for prediction of wheat leaf nitrogen concentration from UAV-borne hyperspectral imagery》进行阅读)

产品推荐

FigSpec FS-60C机载高光谱相机

  • 光谱范围:400-1000nmnm

  • 光谱分辨率:2.5nm

  • 光谱波段:1200

  • 空间像素数:1920

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  1. CONNECT:[ UseTime:0.001128s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001076s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000352s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000659s ]
  6. SELECT * FROM `set` [ RunTime:0.000242s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000723s ]
  8. SELECT * FROM `article` WHERE `id` = 546183 LIMIT 1 [ RunTime:0.004503s ]
  9. UPDATE `article` SET `lasttime` = 1783193881 WHERE `id` = 546183 [ RunTime:0.015630s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000479s ]
  11. SELECT * FROM `article` WHERE `id` < 546183 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000725s ]
  12. SELECT * FROM `article` WHERE `id` > 546183 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000607s ]
  13. SELECT * FROM `article` WHERE `id` < 546183 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002075s ]
  14. SELECT * FROM `article` WHERE `id` < 546183 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003773s ]
  15. SELECT * FROM `article` WHERE `id` < 546183 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003003s ]
0.229851s