用遥感影像融合与注意力集成学习,提升灌区作物分类精度。
Attention-Based Ensemble Learning for Crop Classification Using Landsat 8-9 Fusion
- 融合Landsat 8-9影像并用注意力机制选择关键特征
- 在50,835个样本上实现高精度作物分类
- 适合农业遥感、智慧农田研究者参考
遥感为获取作物总面积和类型信息提供了高效手段。本研究聚焦巴基斯坦旁遮普省中部灌溉区的作物覆盖识别。数据采集分两阶段:第一阶段于2023年1月至2月通过实地调查确定并地理编码了6种目标作物;第二阶段获取每个地块对应的Landsat 8-9影像,构建标注数据集。影像经辐射定标、大气校正及坐标系统验证等预处理,随后采用图像融合技术整合Landsat 8与9的光谱波段,生成具有更丰富光谱信息的复合影像,并进行对比度增强。调研期间通过农户访谈和GPS精准测绘,共形成50,835个数据点。基于此数据集提取了NDVI、SAVO、RECI、NDRE等植被指数。结合原始反射率值,采用传统分类器、集成学习与人工神经网络进行建模,并引入特征选择方法以确定最优特征组合。结果表明,融合遥感数据与先进建模技术可显著提升灌溉区作物分类准确率。
原文摘要 · Abstract (English)
Remote sensing offers a highly effective method for obtaining accurate information on total cropped area and crop types. The study focuses on crop cover identification for irrigated regions of Central Punjab. Data collection was executed in two stages: the first involved identifying and geocoding six target crops through field surveys conducted in January and February 2023. The second stage involved acquiring Landsat 8-9 imagery for each geocoded field to construct a labelled dataset. The satellite imagery underwent extensive pre-processing, including radiometric calibration for reflectance values, atmospheric correction, and georeferencing verification to ensure consistency within a common coordinate system. Subsequently, image fusion techniques were applied to combine Landsat 8 and 9 spectral bands, creating a composite image with enhanced spectral information, followed by contrast enhancement. During data acquisition, farmers were interviewed, and fields were meticulously mapped using GPS instruments, resulting in a comprehensive dataset of 50,835 data points. This dataset facilitated the extraction of vegetation indices such as NDVI, SAVO, RECI, and NDRE. These indices and raw reflectance values were utilized for classification modeling using conventional classifiers, ensemble learning, and artificial neural networks. A feature selection approach was also incorporated to identify the optimal feature set for classification learning. This study demonstrates the effectiveness of combining remote sensing data and advanced modeling techniques to improve crop classification accuracy in irrigated agricultural regions.
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