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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Association of Geographic Information Studies
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The Korean Association of Geographic Information Studies
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Volume & Issues
Volume 2, Issue 3 - Dec 1999
Volume 2, Issue 2 - Oct 1999
Volume 2, Issue 1 - May 1999
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A Preprocessing Scheme of Thinning Capable of Lines' Thickness Recognition for the Automated Vectorizing of Maps
Jeon, Ilsoo ; Won, Namsik ; Bu, Kidong ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 1~8
Information representing the thickness of the original lines from the thinning results can be used efficiently in order to implement the automated vectorizing system. This paper proposes a preprocessing scheme of thinning which can show the information of the original lines' thickness from the thinning result. In the proposed scheme, the depth of each pixel constructing the lines was calculated, which was represented by the number of layers composed of neighboring pixels surrounding the original pixel. And then the original lines' thickness could be recognized through the depth information of the skeleton from the thinning results. We implemented the proposed scheme and experimented on a contour map. Using the depth information of the skeleton, we could easily distinguish each line of the contour either an intermediate or an index contour.
Radiometric Correction Algorithm for KITSAT-3 Images
Shin, Dongseok ; Kwak, Sunghee ; Kim, Tag-Gon ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 9~14
This paper describes an algorithm for the correction of major radiometric errors shown in MEIS (Multi-spectral Earth Imaging System) images on board KITSAT-3. MEIS images contain various radiometric errors as also shown in the images obtained from other remote sensing sensors. This paper introduces the two major radiometric error sources shown in MEIS images and the corresponding correction algorithm. The proposed algorithm was integrated to an operational preprocessing software and validated by applying the algorithm to several tens of MEIS images. This algorithm will therefore applied operationally to raw MEIS images before they are distributed to users.
Agricultural Application of GIS: Establishment and Utilization of Horticultural Field Database
Shin, Young Chul ; An, Sang Hyun ; Park, Young Dal ; Kim, Sun Young ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 15~26
A horticultural field database system is constructed for the intelligent farm management using GIS. The database system include both spatial and attribute data of the GIS that can be used as useful information for the farmers every year. The result of the research is summarized as follow; First, the system provides the position, attributes and spatial data of the horticultural farm through AML. Second, the user interface that composed of a basic function menu and application menu is easy to use. Third, the method which applicated overlay and analysis would be need to manage farming data in this horticultural farm and to develop a dynamic decision support system interfaced with GIS.
A Study of Collaboration between the Census and GIS for Urban Analysis: Modification of Digital Maps and Establishment of Census Tracts
Koo, Chamun ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 27~44
Digital maps produced in Korea are various in scale and include a lot of geographic and attribute data. In this study, it is argued that, to reduce the production cost and the difficulties for renewal, it is necessary to establish the already nationally drawn 1:5,000 scale digital maps as the base maps and simplify them as much as the TIGER files in the U.S. The comprehensive data included in the digital maps in Korea are mostly land use information, which are supposed to be established separately from the digital maps. The land use information system could be maintained and updated cheaply and frequently at the local government level. In response to common needs, the land use information could be imported to GIS and used for analyses. As technologies and societies changes, the Census questions and methodologies should be changed for better uses. Along with GIS, the Census would be developed and processed more reliably and efficiently. Also, it is recommended for Korean government to develop the Census Tract and Block Group system. Current Eup, Myon, Dong as basic units for Census information may not be useful or effective for micro level urban analyses and public service planning activities because of their large population and land areas. It is recommended that optimum population of a Census Tract be 5,000 and a Block Groups 1,500, and one Census Tract includes 1~9 Block Groups. It is recommend that Census Tract and Block Group boundary lines be decided flexibly in light of population, physical features, socio-economic attributes, and tradition. For urban analyses using GIS, socio-economic census data, city government's information such as parcel data and building permit data, survey data, and satellite image data could also be used. The existence of Census Tracts and Block Groups as well as GIS could help for the data and methods to be useful for urban analyses and public service provisions.
Distributions of Hydrogeological Variables and Flow Field on GIS Digital Map
Lee, Cheo K. ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 45~58
Digital map is utilized for an effective display of the distributions of the hydrogeological variables such as water table height(hydraulic head) and log-transmissivity(lnT) in north Pohang, KyungBug. Specifically the geostatistical method kriging is used to construct the distributions in an unconfined aquifer from a finite set of measured data. The experimental variograms for both the head and lnT suggest spherical models with nugget of 0 and range of 6km. The kriged results by using these variograms show that the head decreases primarily from the west to the east with a large peak in the north-western part and lnT is at the maximum level in the central part with outwardly decreasing trend. The constructed delineation is also used to calculate the flow field in the region. Finite differences with second order consistency are used to calculate the fluxes in the east(x) and north(y) across a vertical cross-section of unit width and height equal to the thickness of the wet zone in the aquifer. It is demonstrated that the flow is dominantly in the east with diverging trend on the eastern hillside of the water table peak. A few convergent spots also appear.
The Remote Sensing Algorithm for Analysis of Suspended Sediments Distribution in Lake Sihwa and Coastal Area
Jeong, Jongchul ; Yoo, Sinjae ; Kim, Jungwook ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 59~68
The study for detecting suspended sediment distribution in Lake Sihwa, which has a large surface area and coastal area, using remote sensing technique was carried out with development of satellite data collected since 1970. The research, however, analysis of spatial distribution and quantity, is not common in domestic study and useful algorithms have not been proposed. In this study, a suspended sediment algorithm was composed with in-situ data obtained in study area and remote sensing reflectance obtained in-water optical instrument, which has SeaWiFS wavelength bands. However, when the algorithm was applied to Landsat TM data, including an in-situ data set, and some problems arose. The composition of the algorithm which was structured with band difference and band ratio showed the correlation of
=0.7649 with concentration of suspended sediments. And, between calculated and observed concentration of suspended sediments there was a correlation of
=0.6959. However, remote sensing reflectance obtained from Landsat TM is not good for the estimation of concentration of suspended sediments, because of high concentration of chlorophyll and CDOM(colored dissolved organic matter).
A Neural Network for Long-Term Forecast of Regional Precipitation
Kim, Ho-Joon ; Paek, Hee-Jeong ; Kwon, Won-Tae ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 69~78
In this paper, a neural network approach to forecast Korean regional precipitation is presented. We first analyze the characteristics of the conventional models for time series prediction, and then propose a new model and its learning method for the precipitation forecast. The proposed model is a layered network in which the outputs of a layer are buffered within a given period time and then fed fully connected to the upper layer. This study adopted the dual connections between two layers for the model. The network behavior and learning algorithm for the model are also described. The dual connection structure plays the role of the bias of the ordinary Multi-Layer Perceptron(MLP), and reflects the relationships among the features effectively. From these advantageous features, the model provides the learning efficiency in comparison with the FIR network, which is the most popular model for time series prediction. We have applied the model to the monthly and seasonal forecast of precipitation. The precipitation data and SST(Sea Surface Temperature) data for several decades are used as the learning pattern for the neural network predictor. The experimental results have shown the validity of the proposed model.
Evaluation of Damaged Stand Volume in Burned Area of Mt. Weol-A using Remotely Sensed Data
Ma, Ho-Seop ; Chung, Young-Gwan ; Jung, Su-Young ; Choi, Dong-Wook ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 79~86
This study was carried out to estimate the area of damaged forest and the volume of stand tree in burned area, Mt. Weol-A in eastern Chinju, Korea using digital maps derived from supervised classification of Landsat thematic mapper(TM) imagery as reference data. Criterion laser estimator and WinDENDRO
(v. 6.3b) system as a computer-aided tree ring measuring system were used to measure a volume and age of sampled tree. The sample site had been chosen in unburned areas having the same terrain condition and forest type of burned areas. The tree age, diameter at breast height, tree height and volume of the sample tree selected from sample site in unburned area were 27years, 20.9cm, 9.7m and
respectively. Total stand volume of sample site was estimated
/0.04ha, Damaged stand volume evaluated to about
in the burned area of 218.4ha.
Benefit-Cost Analysis of GIS in Local Governments: A Case Study of Taegu Metropolitan City
Jo, Myung-Hee ; Kim, Kwang Ju ; Park, Sang-Woo ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 2, 1999, Pages 87~96
Using the case of Taegu city, this study analyses benefits and costs related to the construction of GIS to local government. For this purpose, the study uses a case study selecting Taegu Metropolitan city. In this study, four discount rates(5%, 8%, 10%, 12%) are used for sensitivity analyses. According to this benefit-cost analysis, Taegu city government could get positive net present benefits from the year of 2004 which is 6 years after its GIS construction. This a result, Provides the economical and financial validity of GIS Construition in local government. In this study, analysis of invisible benefits are excluded. If these invisible and potential benefits are included in the analysis, GIS could produce more net benefits and the even break point of GIS construction in local governments will come earlier. For the further study, the study needs to develop new benefits and utilize cost-effectiveness analysis to catch these invisible benefits.