• Journal of Korean Society for Geospatial Information Science
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• v.17 no.1
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• pp.3-11
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• 2009

This study aims at proposing that high resolution satellite images could be used to form an urban management plan by calculating the amount of green areas and detecting land use changes in each zoning region within urban planning jurisdiction of Jinju in Gyeongsangnam-do selected as a case study area, analysing imagery of IKONOS and KOMPSAT-2 that are high resolution satellite images. In conclusion, application possibilities of high resolution satellite images as assessment data of urban management administration that help to assess changes in each zoning region are indicated after developing modules based on ArcGIS for calculation and detection of green areas and land use changes and then analysing land use changes and spatial distribution of green areas by using those modules.

• Journal of the Korean Association of Geographic Information Studies
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• v.3 no.4
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• pp.63-72
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• 2000

The objective of this study was to identify the applicability of AGNPS(Agricultural Nonpoint Source Pollution) model using RS data; Landsat TM merged by KOMPSAT EOC and GIS data. AGNPS model which is well-known distributed nonpoint source pollution model was used as the assessment tool. This model has the capability to adjust the level of pollutant load from farmstead and the fertilization level of upland field. A small agricultural watershed($4.12km^2$) which has 20 livestock farmhouses located in Gosan-myun, Ansung-gun was selected. AGNPS data were prepared by using Arc/Info, GRASS, ER-Mapper and Idrisi. Four storm events in 1999 were used for runoff calibration, and 2 storm events which were measured in hourly-base at 4 locations along the stream were used for water quality(TN, TP) calibration.

• Bulletin of the Korean Space Science Society
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• 2003.10a
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• pp.98-98
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• 2003

우리나라 최초의 다목적 실용위성인 아리랑 1호는 지난 2003년 2월 21일부로 목표 하였던 임무운영기간 3년을 완수하였으며, 현재는 연장 운영을 하고 있다. 당초 목표했던 3년의 임무 수명을 뛰어 넘어 향후 2∼3년은 더 운영할 수 것으로 예측하고 있다. 따라서 위성체의 각 서브시스템의 상황을 분석하고 발생한 문제에 대해 신속히 대처하는 것이 중요하다. 아리랑 1호는 크게 탑재체, 자세제어계(AOCS), 전력계(EPS), 추진계(PS), 열제어계(TCS), 원격측정명령계(TC&R)의 Subsystem으로 구성되어 있다. 본 논문에서는 발사부터 목표 임무운영기간까지 서브시스템 중 원격측정명령계의 상태를 분석 정리하였으며, 초과운영에 있는 현 시점의 상태를 정리하였다.

• Korean Journal of Remote Sensing
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• v.19 no.3
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• pp.201-208
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• 2003

Much effort has been made in the radiometric calibration of the ocean scanning multispectral imager (OSMI) since after the successful launch of KOMPSAT-1 in 1999. A series of calibration coefficients for OSMI detectors were obtained in collaboration with the NASA Sensor Intercomparison and Merger for Biological and Interdisciplinary (SIMBIOS) project office. In this study, we ompare the OSMI level-2 products (e.g., chorophyll-a concentration) calculated from the NASA cross-calibration coefficients with the SeaWiFS counterparts. Sample study areas are some of diagonostic data sites recommended by the SIMBIOS working group. Results of this study show that the OSMl-derived chlorophyll-a concentration agrees well with the SeaWiFS counterpart in Case 1 water; however, differences become larger in Case 2 water.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.933-939
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• 2001

A Satellite shipping container must afford the satellite a relatively benign thermal, vibration, and particle environment that is oblivious to the extreme temperatures, sand, dust, vibrations and shocks that can accompany the transportation. In this study, we have designed a vibration isolation system of a spacecraft container that will be used to transport a satellite called KOMPSAT (KOrea Multi-Purpose SATellite) -2 from KARI (Korea Aerospace Research Institute) Taejon to its launch site. To identify the dynamic characteristics of the system, a 1/3-scaled mockup of the container was developed. A large electro-magnetic shaker (Max. 240 KN) was used to excite the mockup, and vibration signals from 20 points were collected for modal tests. Numerical simulations through CATIA 3D Modeling were performed to identify the behavior of isolation springs. The results showed that a simplified model predicts the behavior in a reasonable accuracy. Moreover, the model guides us how to design a full-scaled satellite-shipping container.

• Korean Journal of Remote Sensing
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• v.35 no.6_2
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• pp.1083-1093
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• 2019

The purpose of this study is to detect the burned area change by direct burning of tree canopies and post-fire mortality of trees via analyzing satellite imageries from the Korea multi-purpose satellite-2 and -3 (KOMPSAT-2 and -3) for two large-fires over the Goseong-Sokcho and Gangneung-Donghae regions in April 2019. For each case, the burned area was compared between two dates: the day when the fire occurred and 15-18 days after it. As the results, within these two dates, there was no substantial difference in burned area of sites whose severities were marked as "Extreme", but sites with "High" and "Low" severities showed significant differences in burned area between the two dates. These differences were resulted from the lagged post-fire browning of canopies which was detected by images from in-situ observation,satellite, and the unmanned aerial vehicle. The post-fire browning started after 3-4 days and became apparent after 10-15 days. This study offers information about the timing to quantify the burned area by large fire and about the mechanism of post-fire mortality. Also, the findings can support policy makers in planning the restoration of the damaged areas.

• Journal of the Korean Association of Geographic Information Studies
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• v.15 no.2
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• pp.113-125
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• 2012

This research is aimed at evaluating the land surface characterization of KOMPSAT-3A middle infrared (MIR) data. Airborne Hyperspectral Scanner (AHS) data, which has MIR bands with high spatial resolution, were used to assess land surface temperature (LST) retrieval and classification accuracy of MIR bands. Firstly, LST values for daytime and nighttime, which were calculated with AHS thermal infrared (TIR) bands, were compared to digital number of AHS MIR bands. The determination coefficient of AHS band 68 (center wavelength $4.64{\mu}m$) was over 0.74, and was higher than other MIR bands. Secondly, The land cover maps were generated by unsupervised classification methods using the AHS MIR bands. Each class of land cover maps for daytime, such as water, trees, green grass, roads, roofs, was distinguished well. But some classes of land cover maps for nighttime, such as trees versus green grass, roads versus roofs, were not separated. The image classification using the difference images between daytime AHS MIR bands and nighttime AHS MIR bands were conducted to enhance the discrimination ability of land surface for AHS MIR imagery. The classification accuracy of the land cover map for zone 1 and zone 2 was 67.5%, 64.3%, respectively. It was improved by 10% compared to land cover map of daytime AHS MIR bands and night AHS MIR bands. Consequently, new algorithm based on land surface characteristics is required for temperature retrieval of high resolution MIR imagery, and the difference images between daytime and nighttime was considered to enhance the ability of land surface characterization using high resolution MIR data.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.511-513
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• 2001

다목적 실용위성인 아리랑 위성은 각각의 기능을 수행하는 3개의 프로세서들로 분산되어 있으며 이들 프로세서들은 데이터 버스인 MID-STD-1553을 통해 프로세서간 통신을 수행하게 되며, 지상과의 통신을 위해서는 CCSDS(Consultative Committee fur Space Data)[1] 표준 규격을 채택하여 사용하고 있다. 이 표준 규격에 맞추어 지상에서는 위성으로 명령들을 보내게 리며 각각의 3개 프로세서 상에서 수행중인 탑재 소프트웨어 중 명령처리(Command and Communication Interface) 소프트웨어에서는 이들 명령들을 각각의 명령어 유형에 따라 처리하게 된다. 지상으로부터 전송되어진 명령들은 3개 프로세서 중 OBC(On-Board Computer)를 통해 처리되어진 후 1553B Data Bus를 통해 다른 2개 프로세서로 전송되어진다. 본 논문에서는 아리랑 위성에서 처리되는 명령득의 유형의 설계 및 구현 방법을 설명한다.

• Aerospace Engineering and Technology
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• v.5 no.2
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• pp.213-219
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• 2006

Korea Aerospace Research Institute(KARI) performed field campaigns for absolute radiometric calibration with overpassing of satellite Orbview-3 on Cal/ Val site in Goheung and Daejeon. The performed Cal/Val method is the reflectance-based of vicarious calibration methods. We collected ground-based and meteology data such as temperature, surface pressure and reflectance of targets, and radiosonde data only collected on Goheung. Data collected on each field served as input to radiative transfer codes to generate a top-of-atmosphere(TOA) radiance. Derived TOA is compared with DN of overpassing satellite Orbview-3 to calculate calibration coefficient of gain and offset. Also, This study proposed a proper method to prepare absolute radiometic calibration of KOMPSAT-2 by using experience of Field campaign.

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2634-2636
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• 2004

다목적실용위성2호의 위성 본체시스템에는 지상과 연락을 담당하는 주 컴퓨터인 OBC, 위성의 자세를 제어를 위한 원격구동장치인 RDU 그리고 위성의 전원분배를 제어장치인 ECU인 3개의 동일 프로세서(386)가 탑재되어 각 담당 임무를 수행하는 분산형 구조를 갖고 있다. 각 프로세서는 EEPROM과 SRAM 데이터 메모리를 갖고 있는데 전원 리셋이 일어나면 모든 프로그램은 EEPROM에서 SRAM으로 복사되어 운영 프로그램이 실행하도록 되어 있다. 그러나 SRAM은 우주환경에서 위성체는 방사선에 노출되어 손상을 입을 때 SEU이 발생되어 정보가 왜곡되거나 상실되는 문제를 갖고 있다. 그러므로 본 논문에서는 변형된 해밍코드 기법을 이용하여 데이터를 수신하는 곳에서 에러를 검출 및 수정하는 디지털 회로 설계방법을 기술하고자 한다.