Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Consideration Points for application of KOMPSAT Data to Open Data Cube

다목적실용위성 자료의 오픈 데이터 큐브 적용을 위한 기본 고려사항

  • 이기원 (한성대학교 전자정보공학과) ;
  • 김광섭 (한성대학교 전자정보공학과) ;
  • 이선구 (한국항공우주연구원 위성활용실) ;
  • 김용승 (한국항공우주연구원 위성활용실)
  • Received : 2019.02.13
  • Accepted : 2019.03.20
  • Published : 2019.03.31
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Abstract

Open Data Cube(ODC) has been emerging and developing as the open source platform in the Committee on Earth Observation Satellites(CEOS) for the Global Earth Observation System of Systems(GEOSS) deployed by the Group on Earth Observations (GEO), ODC can be applied to the deployment of scalable and large amounts of free and open satellite images in a cloud computing environment, and ODC-based country or regional application services have been provided for public users on the high performance. This study first summarizes the status of ODC, and then presents concepts and some considering points for linking this platform with Korea Multi-Purpose Satellite (KOMPSAT) images. For the reference, the main contents of ODC with the Google Earth Engine(GEE) were compared. Application procedures of KOMPSAT satellite image to implement ODC service were explained, and an intermediate process related to data ingestion using actual data was demonstrated. As well, it suggested some practical schemes to utilize KOMPSAT satellite images for the ODC application service from the perspective of open data licensing. Policy and technical products for KOMPSAT images to ODC are expected to provide important references for GEOSS in GEO to apply new satellite images of other countries and organizations in the future.

지구관측위성 위원회(Committee on Earth Observation Satellites: CEOS)에서 주관하는 오픈 데이터 큐브(Open Data Cube: ODC)는 지구관측그룹(Group on Earth Observations: GEO)에서 구축하는 전 지구 관측시스템(Global Earth Observation System of Systems: GEOSS)의 기반 플랫폼으로 적용되고 발전하고 있다. ODC는 클라우드 컴퓨팅 환경을 기반으로 무상으로 공개되는 대용량의 위성영상정보를 이용하여 국가 규모, 지역 단위에서 사용자가 원하는 다양한 수준의 과학적 정보처리와 분석을 목적으로 하는 응용 서비스 구축에 적용할 수 있는 오픈소스 플랫폼이다. 이 연구에서는 ODC의 주요 특징에 대하여 유사한 목적을 갖는 구글 어스 엔진과 비교하여 설명하였다. 그리고 ODC에 대하여 소개하고 우리나라의 다목적실용위성(KOMPSAT) 영상정보를 이 플랫폼에 적용하는 데 필요한 기본 개념과 고려 사항을 제시하고자 한다. 또한, KOMPSAT 위성영상을 이 플랫폼에서 사용하기 위한 단계를 구분하여 설명하였고 실제 데이터를 이용하여 데이터의 입력과 등록에 적용되는 중간 과정을 예시하였다. 한편 오픈 데이터 사용권 관점에서 KOMPSAT 위성영상을 ODC 응용 서비스에서 적용할 수 있는 실제 방안을 제시하였다. KOMPSAT 위성영상정보의 ODC 적용을 위한 정책과 기술 사항들은 향후 GEO의 GEOSS에 다른 유상 위성정보를 사용하는 데 중요한 근거가 될 것으로 기대한다.

Keywords

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FIGURE 1. Interrelations among GEO, GEOSS, CEOS, and Open Data Cube

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FIGURE 2. Data Cube task in AOGEOSS (edited and excerpted from https://aogeoss.com/en/staticpages/index.php/task)

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FIGURE 3. The status of the country-based data cube, as of December 2018 (edited country development at https://www.opendatacube.org/ceos)

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FIGURE 4. Simple view of ODC components for application services

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FIGURE 5. KOMPSAT data application procedure in Open Data Cube

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FIGURE 7. (a) Measurement listing result of KOMPSAT ingestion, (b) RGB compositing of KOMPSAT images in ODC

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FIGURE 6. (a) YAML result of defining product, (b) Python module for indexing configuration of KOMPSAT optical images and (c) YAML result of ingesting data

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FIGURE 8. Example of ODC application case with data search modes and analytical functions (excerpted from http://ec2-52-201-154-0.compute-1.amazonaws.com/)

TABLE 1. Comparison of ODC and GEE

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