BPDF-DPC-CN: Polarized reflectance in China

The DPC-2 (Directional Polarimetric Camera-2) sensor was launched in September 2021 on board GF-5(02) satellite. This dataset (BPDF-DPC-CN) is based on the DPC-2/GF-5(02) polarization data from March 2022 to February 2023.Firstly, the DPC-2/GF-5(02) L1B data were processed by removing the cloud and snow, and the satellite polarimetric data were temporally and spatially matched with the SONET (Sun-sky radiometer Observation NETwork) ground-based observation data. Secondly, the polarimetric atmospheric correction were conducted for pixels with low aerosol optical depth, and we acquired the surface polarized reflectance nearby SONET stations. Finally, we kept 10000 data with the best quality under each land cover type in China through expert decision-making.This dataset provides BPDF (Bidirectional Polarization Distribution Function), the percentage of each IGBP (International Geosphere-Biosphere Programme) type, NDVI (Normalized Difference Vegetation Index), latitude and longitude, and observation geometry in China under 6 major different IGBP types (4, 9, 10, 12, 13, 16).

定向偏振相机2号（Directional Polarimetric Camera-2，DPC-2）于2021年9月搭载高分五号02星（GF-5(02)）发射升空。本数据集（BPDF-DPC-CN）基于2022年3月至2023年2月期间获取的DPC-2/GF-5(02)偏振观测数据构建。首先，对DPC-2/GF-5(02)的L1B级数据开展云雪去除预处理，并将卫星偏振数据与太阳-天空辐射计观测网（Sun-sky radiometer Observation NETwork，SONET）的地基观测数据进行时空匹配；其次，针对气溶胶光学厚度较低的像元实施偏振大气校正，获取SONET观测站点周边的地表偏振反射率；最后，通过专家决策方案，在中国境内每种土地覆盖类型下筛选出10000条质量最优的有效数据。本数据集涵盖中国境内6种主要国际地圈生物圈计划（International Geosphere-Biosphere Programme，IGBP）土地覆盖类型（编号为4、9、10、12、13、16）下的双向偏振分布函数（Bidirectional Polarization Distribution Function，BPDF）、各IGBP类型占比、归一化植被指数（Normalized Difference Vegetation Index，NDVI）、经纬度坐标以及观测几何参数。

搜集汇总

背景与挑战

背景概述

BPDF-DPC-CN数据集基于DPC-2/GF-5(02)卫星的偏振数据，提供了中国地区6种主要土地覆盖类型下的偏振反射率及相关参数，数据经过严格的质量控制和处理，适用于地表偏振反射率研究。