FY3C MERSI Daily Land Surface Albedo in Northeast China, 2014 (1 km, GeoTIFF)

Surface albedo is a critical variable in the surface radiation and energy budget, determining the fraction of incoming shortwave radiation that is reflected by the land surface. It is widely used in studies of global climate change, hydrology, ecology, and land–atmosphere interactions. This dataset provides a daily land surface albedo product for Northeast China for the year 2014, derived from FY-3C/MERSI Level-1 observations using a direct-estimation algorithm. After basic preprocessing—including radiometric calibration, destriping, cloud detection, and geometric correction—to obtain clear-sky reflectance, surface albedo is estimated using a lookup-table-based scheme originally developed for MODIS and adapted to FY-3C/MERSI. To improve spatiotemporal continuity, missing values caused by clouds and other data gaps are further filled using a Statistical Temporal Filtering (STF) approach, yielding a gap-reduced 1 km daily land surface albedo record over Northeast China for 2014. The spatial domain covers the main part of Northeast China, including Liaoning, Jilin, Heilongjiang, and eastern Inner Mongolia. The temporal coverage spans 1 January 2014 to 31 December 2014, with one land surface albedo map per day. Each daily map is delivered as a single-band GeoTIFF file with a spatial resolution of approximately 1 km, referenced to an Albers equal-area projection based on the WGS 84 datum. Pixel values represent land surface albedo as unitless fractions, and invalid or missing pixels are flagged with a NoData value of -9999.地表反照率（Surface albedo）是地表辐射与能量收支中的关键变量，决定了入射短波辐射被陆地表面反射的份额。其广泛应用于全球气候变化、水文学、生态学以及陆-气相互作用等研究领域。 本数据集提供2014年中国东北地区的逐日陆地地表反照率产品，该产品基于风云三号C星（FY-3C）/中分辨率光谱成像仪（MERSI）的一级观测数据，采用直接估计算法反演得到。经过辐射定标、去条带、云检测与几何校正等基础预处理步骤获取晴空反射率后，采用针对中分辨率成像光谱仪（MODIS）开发并适配FY-3C/MERSI的查找表方案反演地表反照率。为提升时空连续性，针对云与其他数据间隙造成的缺失值，进一步采用统计时间滤波（Statistical Temporal Filtering, STF）方法进行填补，最终得到2014年中国东北地区无数据间隙的1km分辨率逐日陆地地表反照率数据集。 空间覆盖范围涵盖中国东北地区主体区域，包括辽宁省、吉林省、黑龙江省以及内蒙古自治区东部地区。时间覆盖范围为2014年1月1日至2014年12月31日，每日生成一幅地表反照率影像。每日影像以单波段GeoTIFF文件格式交付，空间分辨率约为1km，采用基于WGS 84椭球体的阿尔伯斯等面积投影坐标系。像素值以无量纲分数形式表征陆地地表反照率，无效或缺失像素采用NoData值-9999进行标记。