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Korean Journal of Remote Sensing

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수록정보
수록범위 : 1권1호(1985)~35권4호(2019) |수록논문 수 : 1,381
대한원격탐사학회지
35권4호(2019년 08월) 수록논문
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KCI등재

1Glacier Change in the Yigong Zangbo Basin, Tibetan Plateau, China

저자 : Chang-qing Ke , Hoonyol Lee , Yan-fei Han

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 491-502 (12 pages)

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Distinguishing debris-covered glaciers from debris-free glaciers is difficult when using only optical remote sensing images to extract glacier boundaries. According to the features that the surface temperature of debriscovered glacier is lower than surrounding objects, and higher than clean glaciers, glacial changes in the Yigong Zangbo basin was analyzed on the basis of visible, near-infrared and thermal-infrared band images of Landsat TM and OLI/TIRS in the support of ancillary digital elevation model (DEM). The results indicated that glacier area gradually declined from 928.76 km2 in 1990 to 918.46 km2 in 2000 and 901.51 km2 in 2015. However, debriscovered glacier area showed a slight increase from 63.39 km2 in 1990 to 66.24 km2 in 2000 and 71.16 km2 in 2015. During 25 years, the glacier length became shorter continuously with terminus elevation rising up. The area of moraine lakes in 1990 was 1.43 km2, which increased to 1.98 km2 in 2000 and 3.41 km2 in 2015. In other words, the total area of the moraine lakes in 2015 is 2.38 times of that in 1990. This increase in moraine lake area could be the result of accelerated glacier melt and retreat, which is consistent with the significant warming trend in recent decades in the basin.

KCI등재

2Estimation of HCHO Column Using a Multiple Regression Method with OMI and MODIS Data

저자 : Hyunkee Hong , Jiwon Yang , Hyeongwoo Kang , Daewon Kim , Hanlim Lee

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 503-516 (14 pages)

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We have estimated the vertical column density (VCD) of formaldehyde (HCHO) on a global scale using a multiple linear regression method (MRM) with Ozone Monitoring Instrument (OMI) and Moderate-Resolution Imaging Spectroradiometer (MODIS) data. HCHO VCDs were estimated in regions of biogenic, pyrogenic, and anthropogenic emissions using independent variables, including NO2 VCD, land surface temperature (LST), an enhanced vegetation index (EVI), and the mean fire radiative power (MFRP), which are strongly correlated with HCHO. To evaluate the HCHO estimates obtained using the MRM, we compared estimates of HCHO VCD data measured by OMI (HCHOOMI) with those estimated by multiple linear regression equations (MRE) (HCHOMRE). Good MRM performances were found, having the average statistical values (R = 0.91, slope = 1.03, mean bias = -0.12 × 1015 molecules cm-2, percent difference = 11.27%) between HCHOMRE and HCHOOMI in our study regions where high HCHO levels are present. Our results demonstrate that the MRM can be a useful tool for estimating atmospheric HCHO levels.

KCI등재

3Histogram Matching of Sentinel-2 Spectral Information to Enhance Planetscope Imagery for Effective Wildfire Damage Assessment

저자 : Minho Kim , Minyoung Jung , Yongil Kim

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 517-534 (18 pages)

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In abrupt fire disturbances, high quality images suitable for wildfire damage assessment can be difficult to acquire. Quantifying wildfire burn area and severity are essential measures for quick short-term disaster response and efficient long-term disaster restoration. Planetscope (PS) imagery offers 3 m spatial and daily temporal resolution, which can overcome the spatio-temporal resolution tradeoff of conventional satellites, albeit at the cost of spectral resolution. This study investigated the potential of augmenting PS imagery by integrating the spectral information from Sentinel-2 (S2) differenced Normalized Burn Ratio (dNBR) to PS differenced Normalized Difference Vegetation Index (dNDVI) using histogram matching, specifically for wildfire burn area and severity assessment of the Okgye wildfire which occurred on April 4th, 2019. Due to the difficulty in acquiring reference data, the results of the study were compared to the wildfire burn area reported by Ministry of the Interior and Safety. The burn area estimates from this study demonstrated that the histogram-matched (HM) PS dNDVI image produced more accurate burn area estimates and more descriptive burn severity intervals in contrast to conventional methods using S2. The HM PS dNDVI image returned an error of only 0.691% whereas the S2 dNDVI and dNBR images overestimated the wildfire burn area by 5.32% and 106%, respectively. These improvements using PS were largely due to the higher spatial resolution, allowing for the detection of sparsely distributed patches of land and narrow roads, which were indistinguishable using S2 dNBR. In addition, the integration of spectral information from S2 in the PS image resolved saturation effects in areas of low and high burn severity.

KCI등재

4Spectral Characteristics of Hydrothermal Alteration in Zuru, NW Nigeria

저자 : Joseph Aisabokhae , Hamman Tampul

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 534-543 (10 pages)

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This study demonstrated the ability of a Landsat-8 OLI multispectral data to identify and delineate hydrothermal alteration zones around auriferous prospects within the crystalline basement, North-western Nigeria. Remote sensing techniques have been widely used in lithological, structural discrimination and alteration rock delineation, and in general geological studies. Several artisanal mining activities for gold deposit occur in the surrounding areas within the basement complex and the search for new possible mineralized zones have heightened in recent times. Systematic Landsat-8 OLI data processing methods such as colour composite, band ratio and minimum noise fraction were used in this study. Colour composite of band 4, 3 and 2 was displayed in Red-Green- Blue colour image to distinguish lithologies. Band ratio image displayed in red was used to highlight ferric-ion bearing minerals (hematite, goethite, jarosite) associated with hydrothermal alteration, band ratio image displayed in green was used to highlight ferrous-ion bearing minerals such as olivine, amphibole and pyroxenes, while ratio image displayed in blue was used to highlight clay minerals, micas, talc-carbonates, etc. Band rationing helped to reduce the topographic illumination effect within images. The result of this study showed the distribution of the lithological units and the hydrothermal alteration zone which can be further prospected for mineral reserves.

KCI등재

5Multi-temporal Analysis of High-resolution Satellite Images for Detecting and Monitoring Canopy Decline by Pine Pitch Canker

저자 : Hwa-seon Lee , Kyu-sung Lee

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 545-560 (16 pages)

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Unlike other critical forest diseases, pine pitch canker in Korea has shown rather mild symptoms of partial loss of crown foliage and leaf discoloration. This study used high-resolution satellite images to detect and monitor canopy decline by pine pitch canker. To enhance the subtle change of canopy reflectance in pitch canker damaged tree crowns, multi-temporal analysis was applied to two KOMPSAT multispectral images obtained in 2011 and 2015. To assure the spectral consistency between the two images, radiometric corrections of atmospheric and shadow effects were applied prior to multi-temporal analysis. The normalized difference vegetation index (NDVI) of each image and the NDVI difference (ΔNDVI = NDVI2015 - NDVI2011) between two images were derived. All negative ΔNDVI values were initially considered any pine stands, including both pitch canker damaged trees and other trees, that showed the decrease of crown foliage from 2011 to 2015. Next, NDVI2015 was used to exclude the canopy decline unrelated to the pitch canker damage. Field survey data were used to find the spectral characteristics of the damaged canopy and to evaluate the detection accuracy from further analysis. Although the detection accuracy as assessed by limited number of field survey on 21 sites was 71%, there were also many false alarms that were spectrally very similar to the damaged canopy. The false alarms were mostly found at the mixed stands of pine and young deciduous trees, which might invade these sites after the pine canopy had already opened by any crown damages. Using both ΔNDVI and NDVI2015 could be an effective way to narrow down the potential area of the pitch canker damage in Korea.

KCI등재

6Analysis on the Effect of Spectral Index Images on Improvement of Classification Accuracy of Landsat-8 OLI Image

저자 : Abraham T. Magpantay , Rossana T. Adao , Joferson L. Bombasi , Ace C. Lagman , Elisa V. Malasaga , Chul-soo Ye

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 561-571 (11 pages)

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In this paper, we analyze the effect of the representative spectral indices, normalized difference vegetation index (NDVI), normalized difference water index (NDWI) and normalized difference built-up index (NDBI) on classification accuracies of Landsat-8 OLI image. After creating these spectral index images, we propose five methods to select the spectral index images as classification features together with Landsat-8 OLI bands from 1 to 7. From the experiments we observed that when the spectral index image of NDVI or NDWI is used as one of the classification features together with the Landsat-8 OLI bands from 1 to 7, we can obtain higher overall accuracy and kappa coefficient than the method using only Landsat-8 OLI 7 bands. In contrast, the classification method, which selected only NDBI as classification feature together with Landsat-8 OLI 7 bands did not show the improvement in classification accuracies.

KCI등재

7Application of Multi-periodic Harmonic Model for Classification of Multi-temporal Satellite Data: MODIS and GOCI Imagery

저자 : Myunghee Jung , Sang-hoon Lee

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 573-587 (15 pages)

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A multi-temporal approach using remotely sensed time series data obtained over multiple years is a very useful method for monitoring land covers and land-cover changes. While spectral-based methods at any particular time limits the application utility due to instability of the quality of data obtained at that time, the approach based on the temporal profile can produce more accurate results since data is analyzed from a long-term perspective rather than on one point in time. In this study, a multi-temporal approach applying a multi-periodic harmonic model is proposed for classification of remotely sensed data. A harmonic model characterizes the seasonal variation of a time series by four parameters: average level, frequency, phase, and amplitude. The availability of high-quality data is very important for multi-temporal analysis. An satellite image usually have many unobserved data and bad-quality data due to the influence of observation environment and sensing system, which impede the analysis and might possibly produce inaccurate results. Harmonic analysis is also very useful for real-time data reconstruction. Multiperiodic harmonic model is applied to the reconstructed data to classify land covers and monitor land-cover change by tracking the temporal profiles. The proposed method is tested with the MODIS and GOCI NDVI time series over the Korean Peninsula for 5 years from 2012 to 2016. The results show that the multi-periodic harmonic model has a great potential for classification of land-cover types and monitoring of land-cover changes through characterizing annual temporal dynamics.

KCI등재

8An Overview of Theoretical and Practical Issues in Spatial Downscaling of Coarse Resolution Satellite-derived Products

저자 : No-wook Park , Yeseul Kim , Geun-ho Kwak

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 589-607 (19 pages)

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This paper presents a comprehensive overview of recent model developments and practical issues in spatial downscaling of coarse resolution satellite-derived products. First, theoretical aspects of spatial downscaling models that have been applied when auxiliary variables are available at a finer spatial resolution are outlined and discussed. Based on a thorough literature survey, the spatial downscaling models are classified into two categories, including regression-based and component decomposition-based approaches, and their characteristics and limitations are then discussed. Second, open issues that have not been fully taken into account and future research directions, including quantification of uncertainty, trend component estimation across spatial scales, and an extension to a spatiotemporal downscaling framework, are discussed. If methodological developments pertaining to these issues are done in the near future, spatial downscaling is expected to play an important role in providing rich thematic information at the target spatial resolution.

KCI등재

9Comparison of Land Surface Temperatures from Near-surface Measurement and Satellite-based Product

저자 : Jae-hyun Ryu , Hoejeong Jeong , Seonwoong Choi , Yang-won Lee , Jaeil Cho

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 609-616 (8 pages)

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Land surface temperature (Ts) is a critical variable for understanding the surface energy exchange between land and atmosphere. Using the data measured from micrometeorological flux towers, three types of Ts, obtained using a thermal-infrared radiometer (IRT), a net radiometer, and an equation for sensible heat flux, were compared. The Ts estimated using the net radiometer was highly correlated with the Ts obtained from the IRT. Both values acceptably fit the Ts from the Terra/MODIS (Moderate Resolution Imaging Spectroradiometer) satellite. These resulTs will enhance the measurement of land surface temperatures at various scales. Further, they are useful for understanding land surface energy partitioning to evaluate and develop land surface models and algorithms for satellite remote sensing producTs associated with surface thermal conditions.

KCI등재

10The Application of the Next-generation Medium Satellite C-band Radar Images in Environmental Field Works

저자 : Hyeon-gyeong Han , Moungjin Lee

발행기관 : 대한원격탐사학회 간행물 : 대한원격탐사학회지 35권 4호 발행 연도 : 2019 페이지 : pp. 617-623 (7 pages)

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Numerous water disasters have recently occurred all over the world, including South Korea, due to global climate change in recent years. As water-related disasters occur extensively and their sites are difficult for people to access, it is necessary to monitor them using satellites. The Ministry of Environment and K-water plan to launch the next-generation medium satellite No. 5 (water resource/water disaster satellite) equipped with C-band synthetic aperture radar (SAR) in 2025. C-band SAR has the advantage of being able to observe water resources twice a day at a high resolution both day and night, regardless of weather conditions. Currently, RADARSAT-2 and Sentinel-1 equipped with C-band SAR achieve the purpose of their launch and are used in various environmental fields such as forest structure detection and coastline change monitoring, as well as for unique purposes including the detection of flooding, drought and soil moisture change, utilizing the advantages of SAR. As such, this study aimed to analyze the characteristics of the next-generation medium satellite No. 5 and its application in environmental fields. Our findings showed that it can be used to improve the degree of precision of existing environmental spatial information such as the classification accuracy of land cover map in environmental field works. It also enables us to observe forests and water resources in North Korea that are difficult to access geographically. It is ultimately expected that this will enable the monitoring of the whole Korean Peninsula in various environmental fields, and help in relevant responses and policy supports.

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