• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
• /
• pp.196-199
• /
• 2008

Lineament is defined generally as a linear feature or pattern on interpretation of a satellite image and indicates the geological structures such as faults and fractures. For this reason, a lineament extraction and analysis using remote sensing images have been widely used for mapping large areas. The Gyeong-gang Fault is a NNE trending structure located in Gangwon-do and Kyeonggi-do district. However, a few geological researches on that fault have been carried out and its trace or continuity is ambiguous. In this study, we investigate the geologic features at Gyeong-gang Fault Zone using LANDSAT ETM+ satellite image and SRTM digital elevation model. In order to extract the characteristics of geologic features effectively, we transform the LANDSAT ETM+ image using Principal Component Analysis (PCA) and create a shade relief from SRTM data with various illumination angles. The results show that it is possible to identify the dimensions and orientations of the geologic features at Gyeong-gang Fault Zone using remote sensing data. An aerial photograph interpretation and a field work will be future tasks for more accurate analysis in this area.

• Journal of Power Electronics
• /
• 제6권1호
• /
• pp.18-28
• /
• 2006

The Electric Power Subsystem (EPS) is one of the most critical systems on any satellite because nearly every subsystem requires power. This makes the choice of power systems the most important task facing satellite designers. The main purpose of the Satellite EPS is to provide continuous, regulated and conditioned power to all the satellite subsystems. It has to withstand radiation, thermal cycling and vacuums in hostile space environments, as well as subsystem degradation over time. The EPS power characteristics are determined by both the parameters of the system itself and by the satellite orbit. After satellite separation from the launch vehicle (LV) to its orbit, in almost all situations, the satellite subsystems (attitude determination and control, communication and onboard computer and data handling (OBC&DH)), take their needed power from a storage battery (SB) and solar arrays (SA) besides the consumed power in the EPS management device. At this point (separation point, detumbling mode), the satellite's angular motion is high and the orientation of the solar arrays, with respect to the Sun, will change in a non-uniform way, so the amount of power generated by the solar arrays will be affected. The objective of this research is to select satellite EPS component types, to estimate solar array illumination parameters and to determine the efficiency of solar arrays during both detumbling and normal operation modes.

• 대한원격탐사학회지
• /
• 제24권1호
• /
• pp.1-16
• /
• 2008

Steam and advection fogs are frequently observed in the Yellow Sea from March to July except for May. This study uses remote sensing (RS) data for the monitoring of sea fog. Meteorological data obtained from the Ieodo Ocean Research Station provided a valuable information for the occurrence of steam and advection fogs as a ground truth. The RS data used in this study were GOES-9, MTSAT-1R images and QuikSCAT wind data. A dual channel difference (DCD) approach using IR and shortwave IR channel of GOES-9 and MTSAT-1R satellites was applied to detect sea fog. The results showed that DCD, texture-related measurement and the weak wind condition are required to separate the sea fog from the low cloud. The QuikSCAT wind data was used to provide the wind speed criteria for a fog event. The laplacian computation was designed for a measurement of the homogeneity. A new combined method, which includes DCD, QuikSCAT wind speed and laplacian computation, was applied to the twelve cases with GOES-9 and MTSAT-1R. The threshold values for DCD, QuikSCAT wind speed and laplacian are -2.0 K, $8m\;s^{-1}$ and 0.1, respectively. The validation results showed that the new combined method slightly improves the detection of sea fog compared to DCD method: improvements of the new combined method are $5{\sim}6%$ increases in the Heidke skill score, 10% decreases in the probability of false detection, and $30{\sim}40%$ increases in the odd ratio.

• 대한원격탐사학회지
• /
• 제37권6_2호
• /
• pp.1869-1880
• /
• 2021

대한원격탐사학회지는 국내 원격탐사 분야를 대표하는 학술지로 원격탐사를 바탕으로 다학제 간 융합연구를 통해 수행된 다양한 분야의 연구논문들이 게재되고 있다. 본 연구는 대한원격탐사학회지에 게재된 논문을 바탕으로 토픽모델링을 수행하여 원격탐사 분야의 역사와 발전에 대해 논의하고자 한다. 1985년부터 2021년까지 총 1,847편의 논문 제목, 주제어, 다국어 초록을 수집하였다. 대한원격탐사학회지의 전반적인 연구 동향과 자연·환경재해 분야의 연구동향을 확인하기 위해 Latent Dirichlet Allocation (LDA)를 수행하였으며, 연구주제를 분류하고 연구동향을 확인하였다. 대한원격탐사학회지 전체 논문을 대상으로 LDA를 수행한 결과 4개의 연구주제('극권', '수권', '지권', '기권')로 분류할 수 있었으며, 시간에 따라 '기권'과 관련된 연구주제들이 성행하는 것을 확인하였다(linear slope=3.51 × 10^-3, p< 0.05). 전체 논문 중 자연·환경재해 분야를 대상으로 LDA를 수행한 결과 7개의 연구주제('해양 오염', '대기 오염', '화산재해', '산불', '홍수', '가뭄', '폭우')로 분류할 수 있었으며, 시간에 따라 '대기 오염'과 관련된 연구주제들이 성행하는 것을 확인하였다(linear slope=2.61 × 10^-3, p<0.05). 본 연구의 결과는 원격탐사를 다루는 다양한 분야의 연구자들에게 원격탐사 분야와 자연·환경재해 분야의 역사와 발전에 대한 이해를 제공했음에 의의가 있다.

• 대한원격탐사학회지
• /
• 제38권5_3호
• /
• pp.811-818
• /
• 2022

최근 전 지구적으로 기후변화에 따른 기상이변으로 인해 지구환경재해 발생 건수가 급속도로 증가하고 있으며, 이에 따른 경제적 손실 및 인명 피해의 규모가 대형화되고 있는 추세이다. 또한, 도시화 및 산업화에 따라 이상기후의 출현 특성 및 규모가 과거와 다른 양상으로 더욱 복합적이고 대형화되고 있어 지구환경재해 대응 및 관리에 원격탐사와 인공지능 기술의 필요성이 더욱 증대되고 있다. 본 특별호는 원격탐사 및 인공지능 기술을 활용한 지구환경재해·재난 관측 및 관리 연구를 살펴보고, 부경대학교 i-SEED 지구환경교육연구단에서 진행하고 있는 가뭄 및 홍수, 대기오염, 해양오염 등 국내에서 발생되는 재해·재난 관련 연구들의 내용 및 결과를 소개하고자 한다. 본 특별호에서 국내 자연재해 관측 및 관리 기술에 대한 정보 공유를 통해 사전에 재해를 예방하고 피해를 저감시킬 수 있는 기술 발전에 기여할 수 있을 것으로 판단된다.

• 대한원격탐사학회지
• /
• 제40권3호
• /
• pp.285-293
• /
• 2024

본 연구는 Google Earth Engine을 활용하여 Sentinel-1 Synthetic Aperture Radar 영상을 통해 남극 Campbell Glacier Tongue (CGT)와 Drygalski Ice Tongue (DIT)의 면적 변화를 2016년부터 2024년까지 모니터링하였다. Otsu 기법과 Simple Non-Iterative Clustering (SNIC) 클러스터링 기법을 사용하여 빙설과 해양을 구분하고 월평균 영상을 통해 빙설 탐지 오류를 줄였다. 분석 결과 CGT는 주기적인 붕괴로 인하여 약 26% 감소하였고 DIT는 전반적으로 증가하다가 최근 급격한 감소를 보였다. Sentinel-2 광학 영상과 비교한 결과 높은 탐지 정확성을 보여 제안된 방법의 신뢰성을 입증하였으며, 본 연구는 남극 빙설과 빙붕의 장기 모니터링에 기여할 것으로 기대된다.

• 한국지구과학회:학술대회논문집
• /
• 한국지구과학회 2005년도 춘계학술발표회 논문집
• /
• pp.174-175
• /
• 2005

• 대한원격탐사학회지
• /
• 제16권2호
• /
• pp.189-198
• /
• 2000

This study introduces the CEOS (Committee for Earth Obseuing Satellites) standard format structure that is applicable to image formats of Earth observation systems, and describes several important parameters for post-process applications, especially in precise SAR geocoding and terrain correction application. ERS and RADARSAT were chosen as a representative case and the meaning and usage of various fields in LEADER file were investigated in detail from the viewpoint of SAR geocoding and terrain correction applications.

• 대한원격탐사학회지
• /
• 제6권1호
• /
• pp.25-37
• /
• 1990

Methods of geometric correction for the Advanced Very High Resolution Radiometer imagery of NOAA satellites were developed and applied to the software for image processing of meteorological satellite data. The software for finding the earth location of each scan position and the software for gridding on original imagery were dedigned. On the assumption of circular orbits and the spherical earth, the methods developed were sufficiently accurate in the purpose of most meteorological data analyses.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
• /
• pp.734-738
• /
• 2002

We present spectral characteristics of tidal flat sediments and algal mat that were tested in the Gomso and Saemangum tidal flats, Korea. The objective of this study is to investigate the spectral reflectance and the radar scattering modeling in the tidal flats. Ground truth data obtained in the tidal flats include grain size, soil moisture content and its variation with time, surface roughness, chlorophyll, ground leveling, and field spectral reflectance measurement. The concept of an effective exposed area (EEA) is introduced to accommodate the effect of remnant surface water, and it seriously affects the reflection of short wavelength infrared and microwave. The nin size of 0.0625 mm has been normally used as a critical size of mud and sand discrimination. But we propose here that 0.25 mm is more practical grain size criterion to discriminate by remote sensing. Algal mat is the primary product in tidal flats, and it is found to be very important to understand spectral characteristics for tidal flat remote sensing. We have also conducted radar scattering modeling, and showed L-band HV-polarization would be the most effective combination.