• Title, Summary, Keyword: EOC

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An analysis of Electro-Optical Camera (EOC) on KOMPSAT-1 during mission life of 3 years

  • Baek Hyun-Chul;Yong Sang-Soon;Kim Eun-Kyou;Youn Heong-Sik;Choi Hae-Jin
    • Proceedings of the KSRS Conference
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    • pp.512-514
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    • 2004
  • The Electro-Optical Camera (EOC) is a high spatial resolution, visible imaging sensor which collects visible image data of the earth's sunlit surface and is the primary payload on KOMPSAT-l. The purpose of the EOC payload is to provide high resolution visible imagery data to support cartography of the Korean Peninsula. The EOC is a push broom-scanned sensor which incorporates a single nadir looking telescope. At the nominal altitude of 685Km with the spacecraft in a nadir pointing attitude, the EOC collects data with a ground sample distance of approximately 6.6 meters and a swath width of around 17Km. The EOC is designed to operate with a duty cycle of up to 2 minutes (contiguous) per orbit over the mission lifetime of 3 years with the functions of programmable gain/offset. The EOC has no pointing mechanism of its own. EOC pointing is accomplished by right and left rolling of the spacecraft, as needed. Under nominal operating conditions, the spacecraft can be rolled to an angle in the range from +/- 15 to 30 degrees to support the collection of stereo data. In this paper, the status of EOC such as temperature, dark calibration, cover operation and thermal control is checked and analyzed by continuously monitored state of health (SOH) data and image data during the mission life of 3 years. The aliveness of EOC and operation continuation beyond mission life is confirmed by the results of the analysis.

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아리랑 1호 EOC영상에서 추출한 DEM의 정확도 향상을 위한 연구

  • 임용조;김태정
    • Proceedings of the KSRS Conference
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    • pp.154-159
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    • 2001
  • 본 논문에서는 인공위성연구센터에서 수행한 아리랑 1호 EOCdud상으로부터의 DEM 생성작업에 관하여 보고한다. EOC 영상으로부터 DEM을 생성하는 작업은 기존의 인공위성연구센터에서 SPOT영상으로부터 DEM 생성을 위하여 개발한 S/W를 이용하여 이루어졌다. 본 논문에서는 DEM생성작업을 크게 카메라 모델링 단계와 영상정합 단계로 구분하여 논의한다. 카메라 모델링 단계에서는 SPOT용으로 개발된 카메라 모델링 기술이 EOC 영상에 적용될 수 있는지를 검토한다. 영상정합 단계에서는 EOC 영상으로부터 가장 우수한 성능의 DEM을 추출하기 위한 영상 정합 파라미터를 추출해낸다. 각 단계별로 EOC 영상을 적용했을 때의 결과를 SPOT 영상을 적용했을 때의 결과와 비교한다. 카메라 모델링과 영상정합의 결과로 EOC 영상으로부터 생성한 DEM의 최종 높이 오차는 약 19m(RMS)로 나타났다. 결론으로 EOC로부터 생성한 DEM의 성능을 SPOT 영상으로부터 얻은 DEM의 성능과 비교하고 향후 EOC 영상으로부터 DEM 생성 작업의 실용화를 위해 필요한 추가 작업들을 기술한다.

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수치지도를 이용한 EOC영상의 반자동 기하보정

  • 안석범;박찬용;최준수;한광수;김천
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • pp.575-580
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    • 2003
  • KOMPSAT-1 위성의 EOC영상은 위성에서 지구를 촬영하는 동안 발생하는 영상 왜곡을 포함하고 있다. 본 연구는 EOC영상의 영상왜곡을 보정하기 위하여 수치지도를 이용하는 정밀기하보정에 대하여 연구한다. 정밀기하보정 과정은 수치지도와 EOC영상의 좌표계를 통합하는 과정을 거쳐 오버레이를 만들어 수치지도의 삼각점을 기준으로 위성영상에서 GCP를 선택하고, 이 GCP를 이용하여 위성 영상을 딜로니 삼각형들의 Mesh형태로 변환하여 모든 딜로니 삼각형을 리샘플링하는 과정을 거쳐 보정된 EOC영상을 얻는다.

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Development of HDF Browser for the Utilization of EOC Imagery

  • Seo, Hee-Kyung;Ahn, Seok-Beom;Park, Eun-Chul;Hahn, Kwang-Soo;Choi, Joon-Soo;Kim, Choen
    • Korean Journal of Remote Sensing
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    • v.18 no.1
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    • pp.61-69
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    • 2002
  • The purpose of Electro-Optical Camera (EOC), the primary payload of KOMPSAT-1, is to collect high resolution visible imagery of the Earth including Korean Peninsula. EOC images will be distributed to the public or many user groups including government, public corporations, academic or research institutes. KARI will offer the online service to the users through internet. Some application, e.g., generation of Digital Elevation Model (DEM), needs a secondary data such as satellite ephemeris data, attitude data to process the EOC imagery. EOC imagery with these ancillary information will be distributed in a file of Hierarchical Data Format (HDF) file formal. HDF is a physical file format that allows storage of many different types of scientific data including images, multidimensional data arrays, record oriented data, and point data. By the lack of public domain softwares supporting HDF file format, many public users may not access EOC data without difficulty. The purpose of this research is to develop a browsing system of EOC data for the general users not only for scientists who are the main users of HDF. The system is PC-based and huts user-friendly interface.

Characteristics of the Electro-Optical Camera(EOC)

  • Lee, Seung-Hoon;Shim, Hyung-Sik;Paik, Hong-Yul
    • Proceedings of the KSRS Conference
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    • pp.313-318
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    • 1998
  • Electro-Optical Camera(EOC) is the main payload of Korea Multi-Purpose SATellite(KOMPSAT) with the mission of cartography to build up a digital map of Korean territory including Digital Terrain Elevation Map(DTEM). This instrument which comprises EOC Sensor Assembly and EOC Electronics Assembly produces the panchromatic images of 6.6 m GSD with a swath wider than 17 km by push-broom scanning and spacecraft body pointing in a visible range of wavelength, 510 ~ 730 nm. The high resolution panchromatic image is to be collected for 2 minutes during 98 minutes of orbit cycle covering about 800 km along ground track, over the mission lifetime of 3 years with the functions of programmable rain/offset and on-board image data storage. The image of 8 bit digitization, which is collected by a full reflective type F8.3 triplet without obscuration, is to be transmitted to Ground Station at a rate less than 25 Mbps. EOC was elaborated to have the performance which meets or surpasses its requirements of design phase. The spectral response the modulation transfer function, and the uniformity of all the 2592 pixel of CCD of EOC are illustrated as they were measured for the convenience of end-user. The spectral response was measured with respect to each gain setup of EOC and this is expected to give the capability of generating more accurate panchromatic image to the EOC data users. The modulation transfer function of EOC was measured as greater than 16% at Nyquist frequency over the entire field of view which exceeds its requirement of larger than 10%, The uniformity that shows the relative response of each pixel of CCD was measured at every pixel of the Focal Plane Array of EOC and is illustrated for the data processing.

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Feasibility on Generating Topographic Map Using KOMPSAT (다목적 실용위성(KOMPSAT)을 이용한 지형도 제작의 가능성 분석)

  • 조우석
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.16 no.2
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    • pp.281-289
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    • 1998
  • Korea is developing a Korea Multi-Purpose Satellite I (KOMPSAT-1) as one of Korea National Space Program, which will be launched in 1999. The EOC (Electro-Optical Camera) is the primary payload for KOMP-SAT-1. The main mission of EOC is to provide the images for the production of scale maps of Korean territory. This research is focused on methodology and possibility for the production of topographic maps using EOC sensor. Since the imagery from EOC is not yet available, SPOT Level 1A image data which are quite similar to those of EOC, and Intergraph Imagestation (Digital Photogrammetric Workstation) are implemented in the process of sample digital map generation. The sample digital maps generated from SPOT stereoimages were compared and analyzed with the existing 1:50,000 scale digital map produced by National Geography Institute. The feasibility and problem encountered in 1:50,000 scale digital mapping using SPOT stereoimages were presented. Based on results, the feasibility and further research areas for KOMPSAT-EOC in the line of 1:25,000 and 1;50,000 digital mapping were discussed.

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KOMPSAT-1 EOC 표준영상 처리

  • Jun, Jung-Nam;Kim, Youn-Soo
    • Aerospace Engineering and Technology
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    • v.2 no.1
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    • pp.197-204
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    • 2003
  • General image processing is the production of images of added value with the use of the original and standard images. Generated data and auxiliary data are backed up and this retrieved data is periodically updated to provide images to outside users. To product general images, makes use of EOC Processing System Software. And then added value images is made from the standard images. Standard and added images are possible with internet for search and promptly provides for user. The process of the standard image derived from the original image(received from the satellite) is systematically arranged in this thesis, which also contains a concise explanation of the EOC processing system.

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Calibration Slope Adjustment for De-Striping KOMPSAT-1 EOC Images

  • Kang, C.H.;Park, D.J.;Ahn, S.I.;Koo, I.H.;Hyun, D.H.;Yang, H.M.;Kim, D.S.;Keum, J.H.;Choi, H.J.
    • Proceedings of the KSRS Conference
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    • pp.1406-1408
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    • 2003
  • KOMPSAT-1 (KOrea Multi-Purpose SATellite ? 1) EOC (Electro Optic Camera) raw images are radiometrically corrected on ground based on the characteristics of EOC. They consist of each CCD (Charge?Coupled Device) pixel’s calibration slope which was measured on ground, electrical gains which are applied to amplify for increasing output pixel counts. Currently, radio-metrically corrected EOC images with calibration slope have still shown defective features by residual stripes. So, it should be compensated by adjusting the calibration slope. In this paper, the adjustment of current calibration slope for de-striping EOC images is addressed and test results are shown.

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Comparison of SSM/I Sea Ice Concentration with Kompsat-1 EOC Images of the Arctic and Antarctic (북극과 남극의 SSM/I Sea Ice Concentration과 Kompsat-1 EOC 영상의 비교)

  • Han Hyang-Sun;Lee Hoon-Yol
    • Proceedings of the KSRS Conference
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    • pp.153-156
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    • 2006
  • 북극과 남극의 해빙을 촬영한 Kompsat-1 EOC 영상을 SSM/I Sea Ice Concentration(SIC)과 비교하였다. EOC 영상은 2005년 $7{\sim}8$월 북극 해빙지역의 가장자리를 지나는 10개 궤도(624 영상)와 $9{\sim}11$월 남극대륙의 가장자리를 지나는 11개 궤도(676 영상)에서 얻어졌다. 그 중 구름의 영향이 없는 약 12%의 영상으로부터 감독분류와 육안분류를 통해 Multi-year ice와 First-year ice(M+F), Young ice(Y), New ice(N)로 해빙의 유형을 구분하여 SIC를 계산하였으며, 이를 NASA Team Algorithm(NTA)으로 계산된 SSM/I SIC와 비교하였다. 북극의 여름철에는 해빙의 시공간적 변화가 매우 크기 때문에 EOC SIC(M+F+Y+N)와 SSM/I SIC의 상관계수는 0.671로 잘 일치하지 않았다. 남극의 봄철에 N을 제외한 EOC SIC(M+F+Y)의 경우 SSM/I SIC와 0.873의 높은 상관계수를 가졌다. 이로부터 NTA로 계산된 남극의 SSM/I SIC가 M과 F를 비롯하여 Y도 포함하는 것을 알 수 있었다.

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Enhancement of Classification Accuracy and Environmental Information Extraction Ability for KOMPSAT-1 EOC using Image Fusion (영상합성을 통한 KOMPSAT-1 EOC의 분류정확도 및 환경정보 추출능력 향상)

  • Ha, Sung Ryong;Park, Dae Hee;Park, Sang Young
    • Journal of the Korean Association of Geographic Information Studies
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    • v.5 no.2
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    • pp.16-24
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    • 2002
  • Classification of the land cover characteristics is a major application of remote sensing. The goal of this study is to propose an optimal classification process for electro-optical camera(EOC) of Korea Multi-Purpose Satellite(KOMPSAT). The study was carried out on Landsat TM, high spectral resolution image and KOMPSAT EOC, high spatial resolution image of Miho river basin, Korea. The study was conducted in two stages: one was image fusion of TM and EOC to gain high spectral and spatial resolution image, the other was land cover classification on fused image. Four fusion techniques were applied and compared for its topographic interpretation such as IHS, HPF, CN and wavelet transform. The fused images were classified by radial basis function neural network(RBF-NN) and artificial neural network(ANN) classification model. The proposed RBF-NN was validated for the study area and the optimal model structure and parameter were respectively identified for different input band combinations. The results of the study propose an optimal classification process of KOMPSAT EOC to improve the thematic mapping and extraction of environmental information.

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