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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Remote Sensing
Journal Basic Information
Journal DOI :
The Korean Society of Remote Sensing
Editor in Chief :
Volume & Issues
Volume 16, Issue 4 - Dec 2000
Volume 16, Issue 3 - Sep 2000
Volume 16, Issue 2 - Jun 2000
Volume 16, Issue 1 - Mar 2000
Selecting the target year
Relationship between RADARSAT Backscattering Coefficient and Rice Growth
Hong, Suk-Young ; Hong, Sang-Hoon ; Rim, Sang-Kyu ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 109~116
This study was carried out to assess the use of RADARSAT data which is C-band with HH polarization for the rice growth monitoring in Korea. Nine time-series data were taken by shallow incidence angle (standard beam mode 5 or 6) during rice growing season. And then, backscattering coefficients (
) were extracted by calibration process for comparing with rice growth parameters such as plant height, leaf area index(LAI), and fresh and dry biomass. Field experimental data concerned with rice growth were collected 8 times for the ground truth at the study area, Tangjin, Chungnam, Korea. At the beginning of rice growth, backscattering coefficients were ranged from -l6~-l3dB when rice fields were not covered with rice canopy and flooded. At the maximum vegetative stage of rice, backscattering coefficients of the rice field were the highest ranging from -4.4dB~-3.1dB. The temporal variation of backscattering coefficient(
) in rice field was significant in this study. Backscattering coefficient (
) of rice field was a little bit lower again after heading stage than before. This results show RADARSAT data is promising for rice monitoring.
Sea Level Variations at Kerguelen Island in the South Indian Ocean by the Satellite Data(ARGOS) and Meteorological Data(METEO)
Yoon, Hong-Joo ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 117~133
We studied the sea level variations at Kerguelen island in the South Indian Ocean with ARGOS data and meteorological data during about 1 year(May 1993~April 1994) through using filter, spectral analysis, coherency and phase, and found characteristics for the two oceanic signal levels(detided oceanic signal level, h
and seasonal oceanic level, h
). The forms of atmospheric pressure variations are good agreed to between ARGOS data and meteorological data in the observed periods. This Kerguelen area shows the inflow of an air temperature(gain of a radiant heat) into the sea water and the stagnation of high atmospheric pressure bands in summer, and the outflow of a sea water temperature(loss of sensible and latent heat) toward the atmosphere and the stagnation of low atmospheric pressure bands in winter. The seasonal difference of sea level between summer and winter is about 1.6cm. Both the detided oceanic signal level(h
) variation and the inverted barometer level(h
) variation have a strong correlation for T>1day period bands. The characteristics of h
variation are not decided by the influence of any meteorological distributions (atmospheric pressure), but the influence of other factors(bottom water temperature) for T>2days periods bands. h
plays a very important role of sea level variation in the observed periods (especially T>about 180days period bands).
Prelaunch Radiometric Performance Analysis of Ocean Scanning Multi-spectral Imager (OSMI)
Cho, Young-Min ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 135~143
Ocean Scanning Multispectral Imager (OSMI) is a payload on the Korean Multi-Purpose SATellite (KOMPSAT) to perform global ocean color monitoring for the study of biological oceanography. HOMPSAT was launched 21 December 1999. The radiometric performance of OSMI is analyzed for various gain settings in the viewpoint of the instrument developer for OSMI calibration and application based on its ground performance data measured before launch. The radiometric response linearity and dynamic range are analyzed and the dynamic range is compared with the nominal input radiance for the ocean and the land. The noise equivalent radiance (NER) corresponding to the instrument radiometric noise is compared with the radiometric resolution of signal digitization (1-count equivalent radiance). The best gain setting of OSMI for ocean monitoring is recommended. This analysis is considered to be useful for the OSMI mission and operation planning, the OSMI image data calibration, and users' understanding about OSMI image quality.
Clustering Algorithm Using Hashing in Classification of Multispectral Satellite Images
Park, Sung-Hee ; Kim, Hwang-Soo ; Kim, Young-Sup ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 145~156
Clustering is the process of partitioning a data set into meaningful clusters. As the data to process increase, a laster algorithm is required than ever. In this paper, we propose a clustering algorithm to partition a multispectral remotely sensed image data set into several clusters using a hash search algorithm. The processing time of our algorithm is compared with that of clusters algorithm using other speed-up concepts. The experiment results are compared with respect to the number of bands, the number of clusters and the size of data. It is also showed that the processing time of our algorithm is shorter than that of cluster algorithms using other speed-up concepts when the size of data is relatively large.
Imaging Mode Design and Performance Characteristics of the X-band Small SAR Satellite System
Kwag, Young-Kil ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 157~175
A synthetic aperture radar (SAR) system is able to provide all-weather, day-and- night superior imaging capability of the earth surface, and thus is extremely useful in surveillance for both civil and military applications. In this paper, the X-band high resolution spaceborne SAR system design is demonstrated with the key design performance for a given mission and system requirements characterized by the small satellite system. The SAR multi-mode imaging technique is presented with a critical parameter assessment, and the standard mode results are analyzed in terms of the image quality performances. In line with the system requirement X-band SAR payload and ground reception/processing subsystems are designed and the major design results are presented with the key performance characteristics. This small satellite SAR system shows the wide range of imaging capability with high resolution, and proves to be an effective surveillance systems in the light weight, high performance and cost-effective points of view.
Quantitative Accuracy Assessment of a SPOT DEM along the Coast-Donghae City Area
Kim, Seung-Bum ; Lee, Hae-Yeoun ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 177~188
Quantitative accuracy assessment of a SPOT DEM (Digital Elevation Model) generated by a fully automatic software is performed along the 90km long coast around Donghae city. The theoretical requirement on the layout of the CPS (Global Positioning System) check points is derived: the Nyquist sampling. Since in practice the Nyquist frequency of a terrain is difficult to determine, the relaxed requirements are introduced and 31 check points are collected accordingly. Accuracy of the SPOT DEM is calculated to be 8.9, 11.5 and 12.0m r.m.s. in latitudinal, longitudinal and elevation directions. The bias is distinguishable from zero only for elevation and is 2.2m. The simple comparison with the world's leading commercial softwares reveals the similar accuracy level.
Technical Review of ERS and RADARSAT SAR CEOS Format for Geocoding and Terrain Correction Applications
Kim, Man-Jo ; Ka, Min-Ho ;
Korean Journal of Remote Sensing, volume 16, issue 2, 2000, Pages 189~198
This study introduces the CEOS (Committee for Earth Obseuing Satellites) standard format structure that is applicable to image formats of Earth observation systems, and describes several important parameters for post-process applications, especially in precise SAR geocoding and terrain correction application. ERS and RADARSAT were chosen as a representative case and the meaning and usage of various fields in LEADER file were investigated in detail from the viewpoint of SAR geocoding and terrain correction applications.