Journal of Geo-information Science, Volume. 22, Issue 9, 1860(2020)
As earth observation enters the big data era, the traditional data management technology has often become insufficient in meeting research needs. As a new open source earth observation data management and analysis platform, Open Data Cube (ODC) is suitable for high-performance computing and exploratory data analysis of time series data. It's an important technical support platform for Asia-Oceania Global Earth Observation System of Systems (AOGEOSS). However, few attempts have been made on domestic satellite imagery data management using ODC. The current ODC lacks automated data organization tools for China's satellite imagery. Therefore, this paper took the domestic GF-1 imagery as an example to explore the automated management of domestic imagery data under the ODC framework by developing middleware called ODC_GFTool. The middleware's development environment is .NET Framework 4.0, which supports the current mainstream Windows 10 operating system. Based on GDAL, YamlDotNet and other components, ODC_GFTool achieves spectral information, band information, spatial reference, and other contents from high-resolution image files. In addition, with the strong matrix computing ability of the Matlab software, ODC_GFTool realizes high score image processing and visualization through mixed programming. The main processes of importing domestic satellite data into ODC using ODC_GFTool include defining GF-1 image products, building indexes, and ingesting data. For demenstration, the paper took Poyang Lake as the test area and did an experimental water extraction. Results show that ODC has obvious efficiency advantage compared with traditional data processing tools. The use of ODC for domestic satellite imagery management increased the storage space by 7.2% and reduced the processing time to one third of the traditional methods. In addition, compared to Google Earth Engine and EarthServer, ODC has the following advantages: (1) ODC supports localized database storage, considering the security of some satellite imagery, data storage and computing need to be local, not in the cloud. (b) As an open source earth observation data management framework, ODC facilitates integration and secondary development according to actual project requirements. Research on ODC data management and application for domestic satellite imagery not only can enrich new ways of domestic image data management in China and increase the practical application value of ODC in the world, but also promote international cooperation and respond to the national earth observation infrastructure construction.
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Junjie LI, Shubo CHEN, Wen ZHANG, Changhui YU, Zhiyuan ZHANG, Lingkui MENG.
Received: Jul. 3, 2019
Accepted: --
Published Online: Apr. 23, 2021
The Author Email: MENG Lingkui (lkmeng@whu.edu.cn)