• 한국산학기술학회논문지
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• 제13권8호
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• pp.3692-3697
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• 2012

Landsat 7은 SLC의 기계적 결함으로 인해 2003년 5월 31일 이후로 SLC-off 상태에서 영상을 취득하고 있으며, 이로 인해 Landsat 7 영상을 활용하기 위해서는 추가적인 보정작업이 필요하다. 본 연구에서는 SLC-off 영상을 보정할 수 있는 Gapfill 함수를 이용하여 Landsat 7 SLC-off 영상을 보정하고, 비슷한 시기의 Landsat 5 영상과 비교하였다. 기준영상 없이 SLC-off 영상을 복원하여 보정영상을 제작함으로써 SLC-off로 인한 누락 영역의 화소가 대부분 복원되었으며, 부자연스러운 노이즈가 없는 영상을 얻을 수 있었다. 또한 보정영상의 토지피복분류를 수행하고, 기준영상을 이용한 분류결과와 비교를 통해 기준영상 없이 보정된 SLC-off 영상의 활용 가능성을 제시할 수 있었다. Landsat 7 SLC-off 보정영상은 주기적인 Landsat 영상의 취득이 어려운 여건을 개선할 수 있을 것이며, 대규모 지역의 변화탐지 및 영상분류는 물론 소규모 구름 등과 같이 국지적으로 발생한 영상 손실의 복원이 가능할 것이다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.229-234
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• 2006

On May 31, 2003. Landsat 7 experienced an anomaly causing the Scan Line Corrector(SLC) to stop functioning normally. The SLC-off causes individual scan lines to alternately overlap and then leave large gaps at the edge of the Image. A many scientists with ongoing experience using ETM+ data evaluated the scientific usability and validity of Landsat 7 products containing the SLC anomaly The best reference scene for gap-filling is the other SLC-on Landsat scene that provide same resolution, few changes, and similar data acquisition. But receiving of Landsat imagery is not stable in Korea. So SPOT image can be another alternative solution because it is a steady-state multispectral satellite image as Landsat image. In this study, we filled the SLC-off gap s of 2, 3, 4 bands using SPOT image by a local regression technique, and assigned the optimum spectral value to gaps of 1, 5, 7 bands based on a spectral adjacency. Through this process, we could restore Landsat SLC-off image and evaluated the accuracy of the results.

• IEIE Transactions on Smart Processing and Computing
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• 제2권3호
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• pp.117-129
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• 2013

The increasing demand for monitoring wildfires and their impact on the land surface have prompted studies of burned area extraction and analysis. To differentiate burned and unburned area, the earlier method of the Moderate Resolution Imaging Spectro-radiometer (MODIS) Burned Area Detection Algorithm was proposed to estimate the change in land surface based on the reflectance energy. The energy, whose wavelengths are sensitive to burning, was selected to calculate the change parameter $Z_{score}$. This method was applied using the MODIS images to produce a MODIS Burned Area product. The approach was to simplify this algorithm to make it compatible with the Landsat 7 ETM+ SLC-off images. To extract the refined version of burned regions, post-processing was carried out by applying a median filter, dilation morphology algorithm, and finally a gap filling method. The experimental results showed that the detailed burned areas extracted from the proposed method exhibited more spatial details than those of the MODIS Burned products in the large U.S areas. The results also revealed the discontinuous distribution of burned regions in Vietnam forests.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.1019-1022
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• 2004

High performance p-ch poly-Si TFTs with excellent stability were developed. By using a frequency doubled DPSS CW laser, the a-Si on glass could be crystallized into one dimensional single crystalline silicon named as a sequential lateral crystallization (SLC) region. We fabricated p-ch TFTs on SLC region and the typical characteristic values of the TFTs were $u_{fe}$ = 180 $cm^2$/Vs, $V_{th}$ = -3 V, S.S. = 0.5 V/dec, and $I_{off}$ = 1 pA/um@ $V_d$ = -10V. It is found that the TFTs are very stable after bias stresses such as negative and positive gate biases, hot carrier bias and high current bias. These results indicate that the poly-Si in SLC region is suitable for system on glass (SOG) application.