• Title/Summary/Keyword: satellite imagery

검색결과 921건 처리시간 0.026초

DESIGN OF STANDARD GRIDDED METADATA FOR INTEGRATED MANAGEMENT OF SATELLITE IMAGERY INFORMATION

  • Han, Eun, Young;Chae, Gee-Ju
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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    • pp.286-289
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    • 2005
  • Recently, in Korea, recognizing the importance of satellite imagery and a national project, the development of satellite providing satellite imagery information of 1m high resolution has been carried out. As the application of satellite. imagery information is expanded to the national land, the environment and geographical information, etc, the necessity of integrated management of satellite imagery information increases. Unfortunately, in case of Korea, currently, the results that institutes for satellite imagery processing produce with satellite imagery have been individually managed. Integrated Management of Satellite Imagery Information project which is being promoted by ETRI (Electronics and Telecommunication Research Institute) in Korea will provide the solutions for the above mentioned problems. In this research work, we designed standard metadata for integrated management of satellite imagery information in consideration of international and national standard.

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An Implementation of Change Detection System for High-resolution Satellite Imagery using a Floating Window

  • Lim, Young-Jae;Jeong, Soo;Kim, Kyung-Ok
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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    • pp.275-279
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    • 2002
  • Change Detection is a useful technology that can be applied to various fields, taking temporal change information with the comparison and analysis among multi-temporal satellite images. Especially, Change Detection that utilizes high-resolution satellite imagery can be implemented to extract useful change information for many purposes, such as the environmental inspection, the circumstantial analysis of disaster damage, the inspection of illegal building, and the military use, which cannot be achieved by low- or middle-resolution satellite imagery. However, because of the special characteristics that result from high-resolution satellite imagery, it cannot use a pixel-based method that is used for low-resolution satellite imagery. Therefore, it must be used a feature-based algorithm based on the geographical and morphological feature. This paper presents the system that builds the change map by digitizing the boundary of the changed object. In this system, we can make the change map using manual or semi-automatic digitizing through the user interface implemented with a floating window that enables to detect the sign of the change, such as the construction or dismantlement, more efficiently.

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Application Fields and Strategy of KOMPSAT-2 Imagery

  • Sakong, Ho-Sang;Im, Jung-Ho
    • 대한원격탐사학회지
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    • 제18권1호
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    • pp.43-52
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    • 2002
  • KOMPSAT-2 satellite is being developed to be launched in 2004 expectingly. This paper is investigating application status of satellite imagery data using various domestic and foreign references such as journals and dissertations and seeing status of policy making and project implementation. In order to promote the application of KOMPSAT-2 imagery, its application ways in each field are presented. In addition, this paper suggests strategies to induce application of KOMPSAT-2 imagery.

Three Dimensional Positioning Accuracy of KOMPSAT-1 Stereo Imagery

  • Jeong, Soo;Kim, Yong-Soo
    • 대한원격탐사학회지
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    • 제16권4호
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    • pp.339-345
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    • 2000
  • KOMPSAT-1 was launched on 21 December, 1999 and the main mission of the satellite is the cartography to provide the imagery from a remote earth view for the production of maps of Korean territory. For this purpose, the satellite has capability to tilt the spacecraft utmost $\pm$45 degrees to acquire stereo satellite imagery in different paths. This study aims to estimate the three dimensional positioning accuracy of stereo satellite imagery from EOC(electro-optical camera), a payload of KOMPSAT-1 satellite. For this purpose, the ground control points and check points were obtained by GPS surveying. The sensor modeling and the adjustment was performed by PCI software installed in KARI (Korea Aerospace Research Institute), which contained mathematical analysis module for KOMPSAT-1 EOC. The study areas were Taejon and Nonsan, placed in the middle part of Korea. As a result of this study, we found that the RMSE(root mean square error) value of three dimensional positioning KOMPST-1 stereo imagery can be less than 1 pixel (6.6 m) if we can use about 10 GCPs(ground control points). Then, a standarrd of FGDC (Federal Geographic Data Committee) of USA was applied to the result to estimate the three dimensional positioning accuracy of KOMPSAT-1 stereo imagery.

인공위성영상을 활용한 북한의 농업생산기반 실태분석 (An Analysis of Agricultural Infrastructure Status of North Korea Using Satellite Imagery)

  • 김관호;이성학;최진용
    • 한국관개배수논문집
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    • 제21권1호
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    • pp.45-54
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    • 2014
  • In this study, Agricultural Infrastructures of Shincheon-gun in North Korea are investigated using Kompsat-2 and RapidEye satellite imagery. Target agricultural infrastructures are agricultural landuse, irrigation and drainage canals, dammed pools for irrigation and pumping stations. KOMPSAT-2 satellite imagery are use to investigate agricultural hydraulic structures and agricultural landuse are investigated by RapidEye Imagery. Geometric correction are performed using 28 GCP and QUAC method are used for atmospherical correction in all imagery. ISODATA clustering and naked-eye classification method are used for extracting agricultural hydraulic structures and Object-based analysis is applied to classifying the agricultural landuse. Extraction results of agricultural hydraulic structures and agricultural are presented and we suggest the applicability of satellite imagery to investigate agricultural infrastructures in North Korea.

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마이크로네시아 웨노섬 연안 서식지 분포의 현장조사와 위성영상 분석법 비교 (Comparison between in situ Survey and Satellite Imagery with Regard to Coastal Habitat Distribution Patterns in Weno, Micronesia)

  • 김태훈;최영웅;최종국;권문상;박흥식
    • Ocean and Polar Research
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    • 제35권4호
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    • pp.395-405
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    • 2013
  • The aim of this study is to suggest an optimal survey method for coastal habitat monitoring around Weno Island in Chuuk Atoll, Federated States of Micronesia (FSM). This study was carried out to compare and analyze differences between in situ survey (PHOTS) and high spatial satellite imagery (Worldview-2) with regard to the coastal habitat distribution patterns of Weno Island. The in situ field data showed the following coverage of habitat types: sand 42.4%, seagrass 26.1%, algae 14.9%, rubble 8.9%, hard coral 3.5%, soft coral 2.6%, dead coral 1.5%, others 0.1%. The satellite imagery showed the following coverage of habitat types: sand 26.5%, seagrass 23.3%, sand + seagrass 12.3%, coral 18.1%, rubble 19.0%, rock 0.8% (Accuracy 65.2%). According to the visual interpretation of the habitat map by in situ survey, seagrass, sand, coral and rubble distribution were misaligned compared with the satellite imagery. While, the satellite imagery appear to be a plausible results to identify habitat types, it could not classify habitat types under one pixel in images, which in turn overestimated coral and rubble coverage, underestimated algae and sand. The differences appear to arise primarily because of habitat classification scheme, sampling scale and remote sensing reflectance. The implication of these results is that satellite imagery analysis needs to incorporate in situ survey data to accurately identify habitat. We suggest that satellite imagery must correspond with in situ survey in habitat classification and sampling scale. Subsequently habitat sub-segmentation based on the in situ survey data should be applied to satellite imagery.

APPLICATION OF SATELLITE IMAGERY FOR DROUGHTS MONITORING IN LARGE AREA

  • Shin Sha-Chul;Jeong Soo;Kim Kyung-Tak;Kim Joo-Hun;Park Jung-Sool
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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    • pp.398-401
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    • 2005
  • Droughts have been an important factor in disaster management in Korea because she has been grouped into nations of lack of water. Satellite imagery can be applied to droughts monitoring because it can afford periodic data for large area for long time. This study aims to develop a method to analyze droughts in large area using satellite imagery. We estimated evapotranspiration in large area using NDVI data acquired from satellite imagery. For satellite imagery, we dealt with MODIS data operated by NASA. As the result of this study, we improved the usability of satellite imagery, especially in drought analysis.

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A building roof detection method using snake model in high resolution satellite imagery

  • Ye Chul-Soo;Lee Sun-Gu;Kim Yongseung;Paik Hongyul
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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    • pp.241-244
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    • 2005
  • Many building detection methods mainly rely on line segments extracted from aerial or satellite imagery. Building detection methods based on line segments, however, are difficult to succeed in high resolution satellite imagery such as IKONOS imagery, for most buildings in IKONOS imagery have small size of roofs with low contrast between roof and background. In this paper, we propose an efficient method to extract line segments and group them at the same time. First, edge preserving filtering is applied to the imagery to remove the noise. Second, we segment the imagery by watershed method, which collects the pixels with similar intensities to obtain homogeneous region. The boundaries of homogeneous region are not completely coincident with roof boundaries due to low contrast in the vicinity of the roof boundaries. Finally, to resolve this problem, we set up snake model with segmented region boundaries as initial snake's positions. We used a greedy algorithm to fit a snake to roof boundary. Experimental results show our method can obtain more .correct roof boundary with small size and low contrast from IKONOS imagery. Snake algorithm, building roof detection, watershed segmentation, edge-preserving filtering

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광역의 가뭄 분석을 위한 위성영상의 활용 (The Application of Satellite Imagery in Droughts Analysis of Large Area)

  • 정수;신사철
    • 대한공간정보학회지
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    • 제14권2호
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    • pp.55-62
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    • 2006
  • 현재 물부족 국가로 분류되고 있는 우리나라 현실에서 가뭄은 재해 관리에 있어서 중요한 요소가 되고 있다. 위성영상은 광역의 지표면에 대해 오랜 시간 동안 주기적으로 자료를 취득할 수 있게 해주므로, 이를 가뭄의 관측에 활용하면 유용한 결과를 얻을 가능성이 크다. 본 연구에서는 광역의 가뭄현상을 해석하는 데 있어서 위성영상을 활용하는 방안을 제시하고자 하였다. 따라서, 미국 NASA에서 제공하는 MODIS 자료의 식생지수(NDVI)자료를 이용하여 광역의 증발산량을 산정하는 방법을 개발하였다. 위성영상을 이용하여 산정된 증발산량 분포를 강우 분포자료 및 잠재증발산량 분포자료와 결합하여 기후학적 물수지를 산정하였으며, 이를 기반으로 대상지역의 가뭄을 효과적으로 분석할 수 있었다. 본 연구의 결과는 가뭄 해석에 있어서의 위성영상의 활용도를 높이는 데 기여를 할 것이다.

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IMPLEMENTATION OF SATELLITE IMAGERY INFORMATION SYSTEM FOR KOREAN METEROLOGICAL ADMINISTRATION AND ITS MEANINGS

  • Chang, Eun-Mi;Park, Jong-Seo;Suh, Ae-Sook
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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    • pp.163-165
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    • 2006
  • We aim to archive all the satellite images that had been scattered into Satellite Imagery Information System with setting naming rules and metadata. More than one million of scenes were collected, rectified into error-free status with metadata . Converting various formats into HDF format after considering GEOTIFF and HDF. Intranet and Internet System had been development to allow all the images to be searched and downloaded with less effort. These system will expand the usage of meteorological satellite images for expert groups and the public outside of KMA.

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