سابِق|تال

GF quantitative remote sensing production system： Core design

  • role： First author第一作者
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

  • Email：zhangzheng@aircas.ac.cn
  • Introduction：张正，研究方向为遥感图像处理、大数据挖掘、高性能计算。E-mail： zhangzheng@aircas.ac.cn
ZHANG Zheng,  
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

LI Hongyi,  
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

HU Changmiao,  
  • role： Corresponding author通信作者
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

  • Email：tangping@aircas.ac.cn
  • Introduction：唐娉，研究方向为遥感图像处理、人工智能与深度学习。E-mail： tangping@aircas.ac.cn
TANG Ping*

ملخص

A fast development in remote sensing science and technologies has been witnessed in recent years with the launch of various remote sensing satellites and the establishment of numerous industrial application systems. Satellite series, like GaoFen, has pushed the richness of data to a new level. Moreover, quantitative product-driven application systems have become increasingly influential in many disciplines. By contrast, the bridge between data and application, namely, the production capability of quantitative products, seems weak, greatly limiting the usage and influence of GaoFen data. The improvement of production capability comes from multiple aspects, including product hierarchy, algorithm model, and production system. In this study, we propose, from the production system perspective, an integrated system design that responds to the four main challenges of the system: uniform data access, heterogeneous algorithm integration, layered workflow orchestration, and cloud infrastructure adaptation.The system is based on algorithm containerization, where executable algorithms and all their dependencies are encapsulated. Thus, it can run uniformly and consistently on different infrastructures without worrying about the complexity caused by deployment. This scenario helps the system to manage diverse remote sensing algorithms uniformly. We employ the Kubernetes container orchestration platform to automate the execution, scaling, and management of containerized algorithms. A containerized cluster consists of multiple master nodes, many computing nodes, and multiple data centers. Multiple algorithm repositories are constructed to support the system and cope with the high computing and data throughput density of remote sensing algorithms. Each algorithm repository is further divided into several subrepositories to improve load balancing. User-defined role-based access control for algorithms is set up to protect the intellectual properties of algorithm owners. A recommended algorithm image architecture is introduced to standardize algorithm encapsulation. A set of nine properties are abstracted to describe uniformly any data entity parameter of an algorithm. This approach ensures that suitable input data can be found for user-uploaded algorithms to run in the system. For data visualization and quantitative computing scenarios, a multiscenario data organization strategy is proposed to avoid excessive data operations, such as projection transform or subdivision. The business logic of the system, from user order creation to product calculation, is detailed for clear implementation. The production sometimes involves workflow batches. We propose a stratified workflow aggregation strategy to optimize workflow execution.The system has been used for large-scale production of various GF quantitative remote sensing products, including surface reflectance product, normalized difference vegetation index product, leaf area index product, and surface albedo product. These products fully cover China’s area for eight successive years from 2013 to 2020, with quantities of more than five million and storages of nearly 300 TB. The proposed system completes the production task smoothly and efficiently.During the routine support for many large-scale production tasks, each part of the system performed consistently with the system design proposed in this study, demonstrating that the study can help build a stable and efficient quantitative remote sensing production system on cloud-native infrastructures

مفهوم

production system;quantitative product;algorithm integration;container;cloud computing;system architecture;workflow

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