• Title/Summary/Keyword: TERRA

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Accuracy Assessment of Atmospheric Sounding Data from Terra/MODIS

  • Lee, Mi-Suk;Kim, Young-Seup;Kwon, Byung-Hyuk;Hong, Ki-Man;Park, Kyung-Won
    • Proceedings of the KSRS Conference
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    • 2003.11a
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    • pp.201-203
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    • 2003
  • Two MODIS instruments on board the Terra and Aqua Satellites are operational for global remote sensing of the land, ocean and atmosphere. Atmospheric sounding data with a high spatial resolution from MODIS will provide a wealth of useful information. The vertical air temperature and moisture data were retrieved using the MODIS data, and compared with the radiosonde data obtained in the Korean Peninsula. The correlation coefficient are 0.99 and 0.89 for air temperature and moisture cases, respectively. Air temperature data were relatively good agreement, but the moisture data from MODIS were underestimated.

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Estimation and Evaluation of Spatial Evapotranspiration Using satellite images and SEBAL Model in Chungju dam watershed (위성영상과 SEBAL 모형을 이용한 충주댐 유역의 공간증발산량 산정 및 평가)

  • Ha, Rim;Shin, Hyung-Jin;Park, Min-Gi;Kim, Seong-Joon
    • Proceedings of the Korea Water Resources Association Conference
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    • 2009.05a
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    • pp.47-51
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    • 2009
  • 증발산량을 산정하는 것은 자연현상과 인문현상을 이해하는 것의 기초가 된다. 이에, 최근 증발산량을 추정하는 많은 연구가 진행되고 있는 가운데 원격탐사 기법을 이용하는 것이 효과적인 것으로 알려지고 있다. 본 연구에서 소개할 SEBAL (Surface Energy Balance Algorithm for Land) (Bastiaanssen, 1995) 모형은 Landsat이나 NOAA 또는 MODIS 같은 원격탐사 위성으로부터 획득한 디지털 이미지 데이터(위성영상)를 이용하여, 지표에서 일어나는 증발산과 기타의 에너지 교환을 계산하는 이미지-프로세싱 모델이다. 우리나라 대상 유역에 위성영상을 사용하여 증발산량을 추정하는 SEBAL 모형의 적용 가능성을 검토하여, 유역 내 증발산량 분포의 시공간적 특성을 분석하고자 하였다. 연구 대상 지역은 유역 면적 약 6661.1km2의 충주댐 유역으로, Terra MODIS 위성영상을 이용하였다. SEBAL 증발산량의 평가를 위해 Penman-Monteith 공식에 의해 계산된 증발산량을 이용하여 비교하였으며, 그 결과 오차가 허용 가능한 10% 이내로 나타났다.

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An Fundamental Study of on Freezing Characteristics of Antarctic Soil (남극 대륙기지 건설지에서 채취한 흙시료의 동결특성에 관한 기초연구)

  • Hong, Seung-Seo;Kim, Young-Seok;Bae, Gyu-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.1030-1038
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    • 2010
  • In order to design and construction of the Antarctic Continental Station at the Terra Nova Bay in the East Antarctic, ground characteristics for soil samples taken from the Antarctic. A series of laboratory tests were performed to investigate the variations of the thermal conductivity, the unfrozen water content according to the temperature change of the soil taken from the Antarctic. The temperature were low down below zero.

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기상청 위성자료의 처리 및 활용

  • Kim, Kum-Lan;Ahn, Myung-Hwan
    • Atmosphere
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    • v.12 no.4
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    • pp.43-55
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    • 2002
  • 기상청의 위성기상업무는 위성자료를 취득하여 위성영상 및 기상분석정보를 생산하고, 예보관을 비롯한 자료 사용자들에게 자료를 신속하게 제공함으로써 체계적인 위성자료 활용서비스를 수행하는 것이다. 최근 외국의 우주개발 동향과 관련하여 활용 가능한 위성자료가 증가함에 따라 위성자료 활용시스템 개선을 추진해 왔으며, 2002년 현재 종래의 GMS, NOAA 이외에 Meteosat-5, FY-2B, FY-1C, Terra, QuickScat, DMSP, TRMM, SeaWiFS 등의 다양한 위성자료를 활용하고 있다. 예보현업에 대한 원격탐사자료 지원업무는 24시간 근무체계로 위성수신분석장비를 안정적으로 운영하면서 각종 위성정보를 종합적으로 활용하여 기상실황의 변화를 감시하고, 특히 전선, 저기압, 태풍에 동반된 구름의 변화상황, 황사의 발생 및 이동 등에 대한 상황을 파악하고 있다. 또한 위성자료의 보존관리 및 외부기관으로부터의 위성자료 요청에 대한 지원업무도 중요한 업무의 하나로 수행하고 있다. 위성정보 활용체계를 강화하기 위해, GMS-5호 위성의 관측임무를 대체하게 될 GOES-9, MTSAT-1R 위성의 자료수신 및 활용체계 구축을 준비하고 있으며, Terra, Aqua와 같은 첨단 지구관측위성자료를 이용한 기상정보 산출기술의 개발을 단계적으로 추진할 것이다.

Extraction of Waterline from X-band Satellite SAR Images (X-밴드 위성 SAR 영상을 이용한 수위선 탐지)

  • Lee, Kyung-Yup;Kim, Youn-Soo
    • Aerospace Engineering and Technology
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    • v.10 no.2
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    • pp.163-169
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    • 2011
  • This paper introduces a method about water line detection using SAR image. The method includes pre-processing of the SAR image with the threshold of the histogram to recognize the boundary between the water and the landmass area. Finally we applied the image differentiation to detect the water line in the SAR image. The TerraSAR-X and the Cosmo-SkyMed images, which are the high spatial resolution X-band SAR data, are used for the evaluation of our algorithm. The accuracy is verified over the stream line in urban area with the result from the Cosmo-SkyMed.

NASA EOS DB Receiving System Development by KARI

  • Ahn, Sang-il;Koo, In-Hoi;Yang, Hyung-Mo;Hyun, Dae-Hwan;Choi, Hae-Jin
    • Proceedings of the KSRS Conference
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    • 2002.10a
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    • pp.89-94
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    • 2002
  • Recently, DARI implemented the receiving and processing system for MODIS sensor data from NASA EOS satellites (TERRA and AQUA). This paper shows the development strategy considered, system requirement derived, system design, characteristic and test results of processing system. System operation concept and sample image are also provided. Implemented system was proven to be fully operational through lots of pass operations activities from RF signal reception to level-1 processing.

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Development of a Method to Estimate Distribution of Paddy Fields in Southeast Asia Using Terra/ASTER Data

  • Sasaki, Gaku;Takeuchi, Wataru;Yasuoka, Yoshifumi
    • Proceedings of the KSRS Conference
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    • 2003.11a
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    • pp.1180-1182
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    • 2003
  • In Asian countries, paddy field is indispensable for our lives not only as a source of food but also ecosystem, hydrology, landscape, culture and global warming. In this sense it is necessary to get the detailed spatial distribution of paddy field in Asian region. Remote sensing seems to be the most appropriate tool to estimate paddy field. In this study, two Terra/ASTER images acquired on different date were used to get a map of paddy field with different planting. ASTER's 15-m resolution was found to be enough to be recognize individual paddy field . Paddies with different planting stages were divided into five types using their spectral patterns. As a result a map of paddies with different planting was obtained with tolerably high accuracy.

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NASA EOS DB Receiving System Development by KARI

  • Ahn, Sang-Il;Koo, In-Hoi;Yang, Hyung-Mo;Hyun, Dae-Hwan;Choi, Hae-Jin
    • Korean Journal of Remote Sensing
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    • v.19 no.1
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    • pp.37-42
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    • 2003
  • Recently, KARI implemented the receiving and processing system for MODIS sensor data from NASA EOS satellites (TERRA and AQUA). This paper shows the development strategy considered, system requirement derived, system design, characteristic and test results of processing system. System operation concept and sample image are also provided. Implemented system was proven to be fully operational through lots of pass operations activities from RF signal reception to level-1 processing.