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- 저자 : 류주형 ( Joo Hyung Ryu ) (검색결과 6 건)
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곰소만 조간대 퇴적물의 Landsat ETM+ 자료 특성
류주형 ( Joo Hyung Ryu ),최종국 ( Jong Kook Choi ),나영호 ( Young Ho Na ),원중선 ( Joong Sun Won ) 대한원격탐사학회 2003 대한원격탐사학회지 Vol.19 No.2
A field survey and Landsat ETM+ image acquisition carried out simultaneously. Using these data, we attempted to establish relationships between tidal flat environmental factors and reflectance observed by ETM+, and to set up a new critical grain size useful for optical remote sensing. Although the grain size of 4φ has been conventionally used as a critical size by sedimentologists, the correlation with optical reflectance was very low. Instead, the grain size of 2φ showed a relatively high correlation coefficient, 0.699, with ETM+ band 4, except near tidal channels in upper tidal flat. We concluded that the grain size of 2φ would be better to use for a critical grain size in Gomso Bay. The grain size also correlated well with moisture content having a correlation coefficient of -0.811 when the 2φ criterion was used. The results of factor analysis showed moisture content was more important parameter than topographic relief, and they were different from German tidal flats in which topographic relief was the prior factor. This can be explained by finer grain composition of the Gomso bay tidal flat. In short, moisture content and topography as well as grain size should be considered in tidal flat remote sensing.
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In-orbit Stray Light Analysis for Step and Stare observation at Geostationary Orbit
오은송,홍진숙,안기범,조성익,류주형,김석환,Oh, Eunsong,Hong, Jinsuk,Ahn, Ki-Beom,Cho, Seongick,Ryu, Joo-Hyung,Kim, Sug-Whan 한국천문학회 2012 天文學會報 Vol.37 No.2
In the remote sensing researches, the reflected bright source such as snow, cloud have effects on the image quality of wanted signal. Even though those signal from bright source are adjusted in corresponding pixel level with atmospheric correction algorithm or radiometric correction, those can be problem to the nearby signal as one of the stray light source. Especially, in the step and stare observational method which makes one mosaic image with several snap shots, one of target area can affect next to the other snap shot each other. Presented in this paper focused on the stray light analysis from unwanted reflected bright source for geostationary ocean color sensor. The stray light effect for total 16 slot images each other were performed according to 8 band filters. For the realistic simulation, we constructed system modeling with integrated ray tracing technique which realizes the same space time in the remote sensing observation among the Sun, the Earth, and the satellite. Computed stray light effect in the results of paper demonstrates the distinguishable radiance value at the specific time and space.
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공간DB엔진(SDE)을 이용한 수치임상도 운영,관리 프로그램 개발(Revision 1.0)
유병오 ( Byung Oh You ),서수안 ( Su An Seo ),류주형 ( Joo Hyung Ryu ) 한국지리정보학회 2011 한국지리정보학회지 Vol.14 No.3
This program was developed to operate and manage the massive digital forest cover type map using SDE(spatial database engine) in order to solve the problems of the analogue mapping system, mapping process and managing vast amounts of data. It was established the standardization process by performing the several functions of application related to the spatial DB search, mapping history and progress control, modification and inspection of the topology error, approval and reject of those maps. It can be possible to generate the effective mapping and distribute maps to the public service. It is expected that the results will be able to reduce time-cost.
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임종수 ( Jong Su Yim ),정일빈 ( Ii Bin Jung ),김종찬 ( Jong Chan Kim ),김성호 ( Sung Ho Kim ),류주형 ( Joo Hyung Ryu ),신만용 ( Man Yong Shin ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.2
The 5th national forest inventory (NFI5) has been reorganized to annual inventory system for providing multi-resources forest statistics at a point in time. The objective of this study is to evaluate statistical estimators for estimating forest growing stock in Chungcheongbuk-Do from annual inventory data. When comparing two estimators; simple random sampling (SRS) and double sampling for post-stratification (DSS), for estimating mean forest growing stock (m3/ha) at each surveyed year, the estimate for DSS in which a population of interest is stratified into three sub-population (forest cover types) was more precise than that for SRS. To combine annual inventory field data, three estimators (Temporally Indifferent Method; TIM, Moving Average; MA, and Weighted Moving Average; WMA) were compared. Even though the estimated mean for TIM and WMA is identical, WMA-DSS is preferred to provide more smaller variance of estimated mean and to adjust for catastrophic events at a surveyed year (so-called lag bias) by annual inventory data.
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원격탐사 자료로부터 해안선 추출에 의한 조간대 DEM 생성
서애숙 ( Ae Sook Suh ),이인태 ( In Tae Lee ),조원진 ( Won Jin Cho ),원중선 ( Joong Sun Won ),전승수 ( Seung Soo Chun ),김금란 ( Keum Lan Kim ),류주형 ( Joo Hyung Ryu ) 대한원격탐사학회 2000 대한원격탐사학회지 Vol.16 No.3
An intertidal topography is continuously changed due to morphodynamics processes. Detection and measurement of topographic change for a tidal flat is important to make an integrated coastal area management plan as well as to carry out sedimentologic study. The objective of this study is to generate intertidal DEM using leveling data and waterlines extracted from optical and microwave remotely sensed data in a relatively short period. Waterline is defined as the border line between exposed tidal flat and water body. The contour of the terrain height in tidal flat is equivalent to the waterline. One can utilize satellite images to generate intertidal DEM over large areas. Extraction of the waterline in a SAR image is a difficult task to perform partly because of the presence of speckle and partly because of similarity between the signal returned from the sea surface and that from the exposed tidal flat surface or land. Waterlines in SAR intensity and coherence map can effectively be extracted with MSP-RoA edge detector. From multiple images obtained over a range of tide elevation, it is possible to build up a set of heighted waterline within intertidal zone, and then a gridded DEM can be interpolated. We have tested the proposed method over the Gomso Bay, and succeeded in generating intertidal DEM with relatively high accuracy.
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