青藏高原Landsat系列卫星遥感增强植被指数（EVI）产品（2023）

1）数据内容：本数据集包含2023年青藏高原地区Landsat长时序EVI产品，空间分辨率为30m。2）数据来源及加工方法：主要是在青藏高原Landsat系列卫星地表反射率数据集的基础上，通过EVI的计算公式进行生产的，即并在NDVI计算公式的基础上引入了背景调节参数C1，C2和大气修正参数L进行计算的；所依赖的地表反射率数据集考虑了地表二向性，因此该EVI数据集不仅消除了大气的影响，也减小了不同太阳高度角引起的反射率差异，具有更好的一致性。3）数据质量描述：为了标识云、冰雪，并相应生产了质量标识文件（QA）。4) 数据应用成果及前景：EVI相比于NDVI具有较强的抗大气干扰能力以及抗噪音能力，更适用于气溶胶含量较高的天气状况下，以及植被茂盛区。

1) Data Content: This dataset contains long-time-series Landsat EVI products over the Qinghai-Tibet Plateau in 2023, with a spatial resolution of 30 m.
2) Data Source and Processing Method: This dataset is primarily generated based on the Landsat series satellite surface reflectance dataset of the Qinghai-Tibet Plateau following the EVI calculation formula. Specifically, background adjustment parameters C1, C2 and atmospheric correction parameter L are introduced on the basis of the NDVI calculation formula. The underlying surface reflectance dataset accounts for surface bidirectional reflectance characteristics, so this EVI dataset not only eliminates atmospheric effects, but also reduces reflectance differences caused by varying solar elevation angles, demonstrating better consistency.
3) Data Quality Description: To identify clouds, snow and ice, corresponding quality assessment (QA) files are produced.
4) Data Application Achievements and Prospects: Compared with NDVI, EVI has stronger resistance to atmospheric interference and noise, and is more suitable for weather conditions with high aerosol content and densely vegetated areas.