祁连山区域基于MODIS数据耦合地形效应的日地表反照率数据集（2019）

本数据集为祁连山区域2019年日分辨率地表反照率产品,空间分辨率500m。采用耦合地形因子的基于MODIS反射率数据协同反演的BRDF\反照率模型，并引入先验知识进行质量控制。MODIS地表反射率数据为官方网站下载，以5天为周期合成日分辨率BRDF，进而估算日分辨率的反照率。经过验证评估，满足反照率应用精度要求，相较于同类产品对快速变化地表特征的捕捉更具有优势，且时空连续性更好。可有效支撑祁连山地区辐射平衡、环境变化研究。

This dataset is a daily-resolution surface albedo product for the Qilian Mountains region in 2019, with a spatial resolution of 500 meters. It adopts a BRDF/albedo inversion model that couples topographic factors and performs collaborative inversion based on MODIS reflectance data, and incorporates prior knowledge for quality control. The MODIS surface reflectance data was downloaded from the official website, and daily-resolution BRDF was synthesized with a 5-day cycle, thereby estimating the daily-resolution albedo. Through validation and evaluation, it meets the accuracy requirements for albedo applications. Compared with similar products, it has greater advantages in capturing rapidly changing surface features and better spatio-temporal continuity. It can effectively support research on radiation balance and environmental change in the Qilian Mountains region.