GF-4 大气校正并行算法研究

大气与环境光学学报 ›› 2021, Vol. 16 ›› Issue (3): 269-282.

• “高分五号卫星大气数据反演”专辑 • 上一篇

GF-4 大气校正并行算法研究

王子翔1;2, 李正强1;2∗, 光洁1, 佘璐3

1 中国科学院空天信息创新研究院, 国家环境保护卫星遥感重点实验室, 北京 100101; 2 中国科学院大学, 北京 100049; 3 宁夏大学资源环境学院, 宁夏银川 750021

收稿日期:2020-07-25 修回日期:2021-03-25 出版日期:2021-05-28 发布日期:2021-05-28
通讯作者: E-mail:lizq@radi.ac.cn E-mail:lizq@aircas.ac.cn
作者简介:王子翔 (1995 - ), 山东淄博人, 硕士研究生, 主要从事高性能地学计算方面的研究。 E-mail: wangzixiang17@mails.ucas.ac.cn
基金资助:
Supported by The Special Fund for Strategic Pilot Technology of Chinese Academy of Sciences (中国科学院战略性先导科技专项 (A类), XDA19080303), National Natural Science Foundation of China (国家自然科学基金, 41925019, 41471306)

Study on Parallel Method of Atmospheric Correction for GF-4 Images

WANG Zixiang1;2, LI Zhengqiang1;2∗, GUANG Jie1, SHE Lu3

1 State Environmental Protection Key Laboratory of Satellite Remote Sensing, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 College of Resources and Environmental Science, Ningxia University, Yinchuan 750021, China

Received:2020-07-25 Revised:2021-03-25 Published:2021-05-28 Online:2021-05-28
Contact: Zheng-Qiang Li E-mail:lizq@aircas.ac.cn

摘要/Abstract

摘要： 高分四号 (GF-4) 是我国第一颗高分辨率对地静止卫星, 地表反射率产品对于评估生态环境与减灾防灾具有重要价值。 GF-4 大气校正算法对地表反射率进行估计, 迭代计算观测与计算表观反射率残差最小值得到气溶胶光学厚度, 并构建 6SV 查找表对地表反射率结果进行计算。在精度验证基础上, 考虑产品生产的高效率需求, 对计算复杂度高的步骤基于图形处理器 (GPU) 进行内核设计, 实现线程、寄存器等性能优化。研究结果表明, 基于 GPU 加速的大气校正算法在性能与能耗上具有较大优势, 一景 GF-4 PMS 的 10240×10240 像元数的影像数据, 相比顺序执行取得 57.3 的总体加速比, 而总体能耗仅为顺序执行的 15.5%。

关键词: 高分四号, 图形处理器, 大气校正, 地表反射率, 气溶胶光学厚度

Abstract: GF-4 is the first high spatial-resolution geostationary satellite of China. Surface reflectance products are of great value for evaluating ecological environment and reducing disasters. GF-4 atmospheric correction algorithm estimates surface reflectance, iteratively calculates the minimum residual error of observed and calculated apprent reflectance to get aerosol optical depth, and constructs a 6SV look-up table to obtain the surface reflectance results. Based on the accuracy verification of GF-4 surface reflectance products, considering the high-efficiency requirements of data analysis and product production, the computationally complex steps are designed based on the graphics processing unit (GPU) to optimize the performance of threads and registers. The results show that the GPU-accelerated atmospheric correction algorithm has great advantages in performance and energy consumption. Compared with sequential execution, a scene of GF-4 PMS image data with 10240×10240 pixels has an overall speedup of 57.3, while the overall energy consumption is only 15.5% of sequential execution.

Key words: GF-4, graphics processing unit, atmospheric correction, surface reflectance, aerosol optical depth

中图分类号:

TP79

王子翔, 李正强, ∗, 光洁, 佘璐. GF-4 大气校正并行算法研究[J]. 大气与环境光学学报, 2021, 16(3): 269-282.

WANG Zixiang, LI Zhengqiang, ∗, GUANG Jie, SHE Lu. Study on Parallel Method of Atmospheric Correction for GF-4 Images[J]. Journal of Atmospheric and Environmental Optics, 2021, 16(3): 269-282.

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GF-4 大气校正并行算法研究

Study on Parallel Method of Atmospheric Correction for GF-4 Images

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