• 대한공간정보학회지
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• 제3권1호
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• pp.79-89
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• 1995

SPOT 위성영상은 궤도의 안정성, 높은 공간해상력 및 적절한 기선대 고도비등을 제공하며 사각 촬영으로 얻어진 위성영상으로부터 3차원 지형정보를 추출할 수 있는 계기를 가져다 주었다. 본 연구에서는 SPOT 입체 위성영상을 이용하여 3차원 지형지물의 특징자료를 추출하고, 이 자료를 이용하여 지형과 지물에 대한 3차원 그래픽 자료를 생성하는 기법과 지형정보의 3차원 그래픽 화일을 컴퓨터상에서 자동생성하고 도시하는 기법을 연구하였다.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.807-812
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• 2008

최근 고해상도 위성영상이 널리 보급됨에 따라 공간 영상 정보를 활용한 사업이나 다양한 응용 분야에서도 지형 또는 지물의 기하 정보의 필요성이 커지고 있다. 특히 공간 영상 정보 시스템에서는 지형 또는 지물에 대한 사실적인 정보를 제공하여 이를 이용한 도시 개발 계획의 수립이나 도로망의 개선 등 다양한 분야로 활용되고 있다. 본 논문은 단일 위성영상에서 건물의 footprint, rooftop 과 그림자 정보를 이용하여 건물을 효과적으로 모델링하기 위한 반 자동화 시스템을 제안한다. 위성영상으로부터 건물의 기하 정보의 추출 및 복원 시 고려할 것은 사용자의 조작을 최소화하면서도 보다 정확하고 빠르게 모델링 및 편집이 가능하여야 한다는 것이다. 이를 위해서 위성영상과 영상의 메타 정보의 활용과 효율적인 조작이 이루어 질 수 있는 인터페이스가 필요하다. 따라서 본 논문에서는 사용자의 입력에 의해 건물의 정보(rooftop, footprint)를 추출하고, 건물의 정보와 메타정보로부터 관심 건물영역에 대한 그림자 정보를 추출한 다음, 높이 정보를 자동적으로 추출해 냄으로써 최소한의 사용자 입력으로 건물을 효과적으로 모델링 할 수 있다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.259-263
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• 2006

Development and maintenance of forests are very important at Korea which has mountainous topography of more than 60% of the national territory. Under the circumstances, variety period's data is being required for the continuous monitoring of forest area. In this study, change of forests type was analyzed using Landsat TM satellite image which have multi-spectral bands. Furthermore, change detection system for forests type was constructed on web for the periodical monitoring. By using this system, everyone can easily use for the monitoring of forest type's periodical change.

• 대한원격탐사학회지
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• 제28권3호
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• pp.287-296
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• 2012

Although low spatial resolution satellite images like MODIS and GOCI can be important to observe land surface, it is often difficult to visually interpret the imagery because of the low contrast by prevailing cloud covers. We proposed a simple and adaptive stretching algorithm to enhance image contrast over land areas in cloudy images. The proposed method is basically a linear algorithm that stretches only non-cloud pixels. The adaptive linear stretch method uses two values: the low limit (L) from image statistics and upper limit (U) from low boundary value of cloud pixels. The cloud pixel value was automatically determined by pre-developed empirical function for each spectral band. We used MODIS and GOCI images having various types of cloud distributions and coverage. The adaptive contrast stretching method was evaluated by both visual interpretation and statistical distribution of displayed brightness values.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.676-679
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• 2006

Mangrove crowns were delineated using active sensor LIDAR (LIght Detection And Ranging) data by a crown delineating model developed in this study. LIDAR data were acquired from airborne survey by a helicopter for the estuary of Macouria in the northeast coast of French Guiana. The canopy height image was derived from LIDAR vector data by calculating the difference between ground and non-ground data. The mangrove site in the study area was classified to three sectors by the time of mangrove settlement; Mangrove 1986, 2002 and 2003. The estimated crown of Mangrove 1986 was reliable defined for their size, number and volume because of larger crown size and bigger variation of crown height. The tree crown size of Mangrove 2002 and 2003 by the model was overestimated and the number of trees was much underestimated. The estimated crown was not for single crown but a crown group due to homogenous crown height and spatial resolution of LIDAR data. However the canopy height image derived from LIDAR data provided three-dimensional information of mangroves.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.563-566
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• 2006

In order for the evaluation and analysis of the spring drought which has been periodically occurring in Korean peninsula since 2000, the use of satellite image data is increasing to investigate temporal and spatial characteristics of the drought areas. The recent spring droughts in south Korea have some characteristics. It last for short period in spring when the activity of vegetation is not lively and it have large areal deviation in the severity of drought. In this study, considering the characteristics of the spring drought in Korean peninsular, the MODIS satellite image data which has superior spatial and radiometric resolutions was used for the analysis of the spring drought. In two basins having different spatial characteristics, the drought events were selected and their severities were analyzed using the MODIS NDVI, LSWI, and daily rainfall data since 2000, and the spatial characteristics of the drought area were analyzed using the DEM, land cover, and digital forest map of the study areas.

• 한국군사과학기술학회지
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• 제13권2호
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• pp.252-257
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• 2010

SAR has pulse compression gain through the process including range and azimuth. Efficient jammers against the SAR with simulated elements are evaluated in the view of power and SAR image. In this paper, J/S is analysed for SAR with RF propagation equation firstly. Several jamming signals on SAR signal are made into SAR image through pulse compression process. Objective jamming performance is evaluated using euclidean distance.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.212-215
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• 2008

The final product generated from the KOMPSAT-2 Terminal for Polar System, K2PS, is an ellipsoid projected image. This leaves a relief displacement on the image by process of which the height value of subject area is constant. In this paper, orthorectification using the SRTM was used to remove such artifacts, and thereafter, the additional product that could be generated from the K2PS was discussed.

• 한국지형공간정보학회:학술대회논문집
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• 한국지형공간정보학회 1995년도 학술발표회 개요집
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• pp.121-142
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• 1995

SPOT 위성영상은 괘도의 안정성, 높은 공간해상력 및 적절한 기선대 고도비등을 제공하며 사각촬영으로 얻어진 위성영상으로부더 3차원 지형정보를 추출할 수 있는 계기를 가져다 주었다. 본 연구에서는 SPOT 입체 위성영상을 이용하여 3차원 지형지물의 특징자료를 추출하고, 이 자료를 이용하여 지형과 지물에 대한 3차원 그래픽 자료를 생성하는 기법과 지형정보의 3차원 그래픽 화일을 컴퓨터상에서 자동생성하고 도시하는 기법을 연구하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.114-117
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• 2007

DES is an improvement of the algorithm Lucifer developed by IBM in the 1977. IBM, the National Security Agency (NSA) and the National Bureau of Standards (NBS now National Institute of Standards and Technology NIST) developed the DES algorithm. The DES has been extensively studied since its publication and is the most widely used symmetric algorithm in the world. But nowadays, Triple DES (TDES) is more widely used than DES especially in the application in case high level of data security is required. Even though TDES can be implemented based on standard algorithm, very high speed TDES codec performance is required to process when encrypted high resolution satellite image data is down-linked at high speed. In this paper, Intel SSE2 (Streaming SIMD (Single-Instruction Multiple-Data) Extensions 2 of Intel) is applied to TDES Decryption algorithm and proved its effectiveness in the processing time reduction by comparing the time consumed for two cases; original TDES Decryption and TDES Decryption with SSE2