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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 17, Issue 4 - Dec 2001
Volume 17, Issue 3 - Sep 2001
Volume 17, Issue 2 - Jun 2001
Volume 17, Issue 1 - Mar 2001
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Development of Suspended Particulate Matter Algorithms for Ocean Color Remote Sensing
Ahn, Yu-Hwan ; Moon, Jeong-Eun ; Gallegos, Sonia ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 285~295
We developed a CASE-II water model that will enable the simulation of remote sensing reflectance(
) at the coastal waters for the retrieval of suspended sediments (SS) concentrations from satellite imagery. The model has six components which are: water, chlorophyll, dissolved organic matter (DOM), non-chlorophyllous particles (NC), heterotrophic microorganisms and an unknown component, possibly represented by bubbles or other particulates unrelated to the five first components. We measured
, concentration of SS and chlorophyll, and absorption of DOM during our field campaigns in Korea. In addition, we generated
from different concentrations of SS and chlorophyll, and various absorptions of DOM by random number functions to create a large database to test the model. We assimilated both the computer generated parameters as well as the in-situ measurements in order to reconstruct the reflectance spectra. We validated the model by comparing model-reconstructed spectra with observed spectra. The estimated
spectra were used to (1) evaluate the performance of four wavelengths and wavelengths ratios for accurate retrieval of SS. 2) identify the optimum band for SS retrieval, and 3) assess the influence of the SS on the chlorophyll algorithm. The results indicate that single bands at longer wavelengths in visible better results than commonly used channel ratios. The wavelength of 625nm is suggested as a new and optimal wavelength for SS retrieval. Because this wavelength is not available from SeaWiFS, 555nm is offered as an alternative. The presence of SS in coastal areas can lead to overestimation chlorophyll concentrations greater than 20-500%.
Improved Free-air Gravity Anomalies by Satellite Altimetry
Kim, Jeong-Woo ; Roman, Daniel-R. ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 297~305
Ocean satellite altimetry-implied free-air gravity anomalies have had the shortest wavelengths removed during the processing to generate the optimal solution between multiple radar altimeter missions. ERS-1 168day mission altimetry was residualized to a reference geoid surface generated by integrating Anderson & Knudsen’s free-air gravity anomalies for the Barents Sea. The altimetry tracks were reduced and filtered to extract the shortest wavelengths (between 4 and 111 km) from both ascending and descending tracks, respectively. These data were recombined using existing quadrant-swapping techniques in the wavenumber domain to generate a correlated, high frequency gravity field related to the local geologic sources. This added-value surface adjusted the reference free-air gravity anomalies to better reflect features in the gravity field at a wavelength related to the distance between altimetry ground tracks.
High Speed Data Link Design for Spaceborne Multi-Mode SAR Image Data Transmission
Kwag, Young-Kil ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 307~317
A high speed dat link capability is one of the critical factors in determining the performance of the spacebome SAR system with high resolution. It is due to the strict requirement for the real-time transmission from a series of massive raw image data of spacebome SAR to the ground station in a limited time of mission. In this paper, based on the data link model characterized by the spacebome small SAR system, the high rate multi-channel data link module is designed including link storage, link processor, transmitter, and wide-angle antenna. The design results are presented with the performance analysis on the data link budget as well as the multi-mode data rate in association with the SAR imaging mode of operation from high resolution to the wide swath. The designed multi-channel architecture can be effectively used for the spacebome and airborne applications which requires to expand the high speed data link capability.
Adaptive Processing for Feature Extraction: Application of Two-Dimensional Gabor Function
Lee, Dong-Cheon ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 319~334
Extracting primitives from imagery plays an important task in visual information processing since the primitives provide useful information about characteristics of the objects and patterns. The human visual system utilizes features without difficulty for image interpretation, scene analysis and object recognition. However, to extract and to analyze feature are difficult processing. The ultimate goal of digital image processing is to extract information and reconstruct objects automatically. The objective of this study is to develop robust method to achieve the goal of the image processing. In this study, an adaptive strategy was developed by implementing Gabor filters in order to extract feature information and to segment images. The Gabor filters are conceived as hypothetical structures of the retinal receptive fields in human vision system. Therefore, to develop a method which resembles the performance of human visual perception is possible using the Gabor filters. A method to compute appropriate parameters of the Gabor filters without human visual inspection is proposed. The entire framework is based on the theory of human visual perception. Digital images were used to evaluate the performance of the proposed strategy. The results show that the proposed adaptive approach improves performance of the Gabor filters for feature extraction and segmentation.
Contextual Modeling and Generation of Texture Observed in Single and Multi-channel Images
Jung, Myung-Hee ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 335~344
Texture is extensively studied in a variety of image processing applications such as image segmentation and classification because it is an important property to perceive regions and surfaces. This paper focused on the analysis and synthesis of textured single and multiband images using Markov Random Field model considering the existent spatial correlation. Especially, for multiband images, the cross-channel correlation existing between bands as well as the spatial correlation within band should be considered in the model. Although a local interaction is assumed between the specified neighboring pixels in MRF models, during the maximization process, short-term correlations among neighboring pixels develop into long-term correlations. This result in exhibiting phase transition. In this research, the role of temperature to obtain the most probable state during the sampling procedure in discrete Markov Random Fields and the stopping rule were also studied.
Assimilation of Oceanographic Data into Numerical Models over the Seas around Korea
Kim, Seung-Bum ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 345~357
This review provides a summary of data assimilation applied to the seas around Korea. Currently the worldwide efforts are devoted to applying advanced assimilation to realistic cases, thanks to improvements in mathematical foundations of assimilation methods and the computing capabilities, and also to the availability of extensive observational data such as from satellites. Over the seas around Korea, however, the latest developments in the advanced assimilation methods have yet to be applied. Thus it would be timely to review the progress in data assimilation over the seas. Firstly, the definition and necessity of data assimilation are described, continued by a brief summary of major assimilation methods. Then a review of past research on the ocean data assimilation in the regional seas around Korea is given and future trends are considered. Special consideration is given to the assimilation of remotely-sensed data.
Agent-Based Load Balancing Method for Web GIS Services; Web-Based Forest Fire Management System
Jo, Yun-Won ; Jo, Myung-Hee ; Oh, Jeong-Soo ;
Korean Journal of Remote Sensing, volume 17, issue 4, 2001, Pages 359~368
The prototype of forest fire management system on Web was studied. In the architecture of this system, one of the most important concerns is to handle load upcoming to Web Server so that it provides Web service without any delay or failure. In order to solve this problem, the agent is designed on dispatcher in a Web server cluster and implemented to distribute load dynamically by considering the information related to load coming to the Web Server such as the number of connection to the Map Server. The proposed forest fire management system has user-friendly interface with the GIS mapping functionality by selecting Map Objects Internet Map Server (MO IMS) as Map Server and is implemented using Java as programming language.