• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.06a
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• pp.258-260
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• 2010

통계지리정보는 기존의 텍스트 기반 통계정보를 공간정보와 결합한 정보로서 공공 민간 분야의 다양한 의사결정을 위한 핵심 기반 정보로 그 활용성이 주목받고 있다. 본 논문은 통계지리 정보와 이를 이용한 서비스 구축 및 유지 관리 과정에서 발생하는 상호운용성 문제의 해결을 위한 접근방법으로 기존의 공간정보 표준 참조 모델들을 기반으로 통계지리 정보 및 서비스 참조모델을 제안하고, 각각의 정보 및 서비스 분류에 해당하는 표준화 요구사항을 제시한다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.39 no.6
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• pp.541-548
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• 2021

Recently, multispectral cameras are being actively utilized in various application fields such as agriculture, forest management, coastal environment monitoring, and so on, particularly onboard UAV's. Resultant multispectral images are typically georeferenced primarily based on the onboard GPS (Global Positioning System) and IMU (Inertial Measurement Unit)or accurate positional information of the pixels, or could be integrated with ground control points that are directly measured on the ground. However, due to the high cost of establishing GCP's prior to the georeferencing or for inaccessible areas, it is often required to derive the positions without such reference information. This study aims to provide a means to improve the georeferencing performance of a multispectral camera images without involving such ground reference points, but instead with the simultaneously onboard high resolution RGB camera. The exterior orientation parameters of the drone camera are first estimated through the bundle adjustment, and compared with the reference values derived with the GCP's. The results showed that the incorporation of the images from a high resolution RGB camera greatly improved both the exterior orientation estimation and the georeferencing of the multispectral camera. Additionally, an evaluation performed on the direction estimation from a ground point to the sensor showed that inclusion of RGB images can reduce the angle errors more by one order.

• Journal of Korean Society for Geospatial Information Science
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• v.13 no.4 s.34
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• pp.75-81
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• 2005

This study intended to show the way of evolving 'National Geographic Information Clearinghouse' to 'National Integrated Geospatial Portal'. For this purpose we have analyzed Geospatial One-Stop Portal in the US and then suggested future model of National Geographic Information Clearinghouse. The Integrated Geospatial Portal model is based on the Reference Model for Open Distributed Processing(RM-ODP) which is an international model for information distribution and sharing. The Integrated Geospatial Portal architecture consists of the data layer, middle-ware, presentation layer. It will help users to determine their fitness for nation wide GIS application and provide tools for accessing, visualizing, or ordering various geospatial data.

• 한국공간정보시스템학회:학술대회논문집
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• 1998.07a
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• pp.223-235
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• 1998

앞으로 다가오는 정보화 사회에서의 국가경쟁력을 키우기 위해서는 정보처리 및 운영능력이 대단히 중요하다. 지리정보는 이러한 정보화 사회에서 중요한 국가 간접자본중의 하나이다. 그리고 국가 GIS에서 가장 풍요한 요소는 지리정보의 호환, 공유, 유통 등을 포함한 지리정보의 활용이다. 따라서 국가적으로 GIS의 활성화를 위하여 지리정보의 표준화가 시급한 실정이다. 이 논문에서는 국제 표준화 기관인 ISO/TC211에서 수행중인 표준화 내용을 분석한다. 특히, 지리정보의 활용과 GIS들간의 상호 연동성을 위한 지리정보/지리공간 서비스를 중점으로 하여 IS0/TC211에서 표준안으로 제시하는 서비스 항목, 인터페이스 등 지리정보 서비스와 관련된 내용을 분석한다.

• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.4
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• pp.122-134
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• 2003

In recent, different kinds of nationwide thematic map have been developed based on NGIS, and each related research field has tried to develop GIS by utilizing this map. Also, Many researches on the geographic information data model has been conducted to improve the compatibility of developed system. The developed system in water resource field should reflect the dynamic characteristics of river flow. Because it should be considered from the design of data model, this study suggests the datamodel for designing geographical information database on water resources which is possible to linear reference capacity based on stream network. In order to examine the applicability of the suggested model, network component based system has developed. Finally, the river network based system shows the superiority in terms of its applicability comparing with other system.

• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.4
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• pp.59-70
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• 2003

Spatial data base system provides many query types and most of them are required frequent disk I/O and much CPU time. k-NN search is to find k-th closest object from the query point and up to now, several k-NN search methods have been proposed. Among these, MINMAX distance method has an aim not to access unnecessary node by adapting pruning technique. But this method accesses more disks than necessary while pruning unnecessary nodes. In this paper, we propose new k-NN search algorithm based on density of object. With this method, we predict the radius to be expected to contain k-NN objects using density of data set and search those objects within this radius and then adjust radius if failed. Experimental results show that this method outperforms the previous MINMAX distance method. This algorithm visit less disks than MINMAX method by the factor of maximum 22% and average 7%.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2003.04a
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• pp.425-430
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• 2003

「국가지리정보체계의구축및활용등에관한법률」 에 규정된 8가지의 기본지리정보가 제2차 NGIS 기본계획에 의하여 구축되고 있다. 국가 기본 데이터로써 지형ㆍ공간적인 기초를 제공하고 타 정보를 표현하기 위한 기초데이터 및 참조데이터인 기본지리정보가 DBMS기반으로 구축됨에 따라 데이터베이스 사용자와 파일 사용자 등 다양한 사용자층에게 기본지리정보를 공급할 메커니즘을 필요로 한다 그러나 현재, 이미 구축된 기본지리정보 데이터베이스를 유통하는 과정에서 표준 파일포맷이나 표준 데이터베이스가 규정되어 있지 않으므로 서로 다른 DBMS를 사용하고 있는 경우, 기본지리정보의 배포 및 공유를 위한 방법이 필요하다. 따라서 이기종 시스템간의 데이터 공유 및 교환이 가능한 방법을 모색하기 위하여 본 논문에서는 기본지리정보의 유통을 위해, 파일에 의한 교환, 데이터제공자에 의한 교환, GML에 의한 교환등 세가지 방법을 제시하고 실험하였다.

• Journal of the Korean Association of Geographic Information Studies
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• v.27 no.1
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• pp.29-40
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• 2024

Recently, the technology of autonomous driving, one of the core of the fourth industrial revolution, is developing, but sensor-based autonomous driving is showing limitations, such as accidents in unexpected situations, To compensate for this, HD-map is being used as a core infrastructure for autonomous driving, and interest in the public and private sectors is increasing, and various studies and technology developments are being conducted to secure the latest and accuracy of HD-map. Currently, NGII will be newly built in urban areas and major roads across the country, including the metropolitan area, where self-driving cars are expected to run, and is working to minimize data error rates through quality verification. Therefore, this study analyzes the spatial relationship of reference objects in the attribute structuring process for rapid and accurate renewal and production of HD-map under construction by NGII, By applying the attribute input automation methodology of the reference object in which spatial relations are established using the library of open source-based PyQGIS, target sites were selected for each road type, such as high-speed national highways, general national highways, and C-ITS demonstration sections. Using the attribute automation tool developed in this study, it took about 2 to 5 minutes for each target location to automatically input the attributes of the spatial relationship reference object, As a result of automation of attribute input for reference objects, attribute input accuracy of 86.4% for high-speed national highways, 79.7% for general national highways, 82.4% for C-ITS, and 82.8% on average were secured.

• Journal of Korean Society of Forest Science
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• v.101 no.2
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• pp.185-194
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• 2012

The purpose of this contribution is to develop the framework of a methodology for identifying potential errors in georeferencing and in an application of it using specimens of Ox-Knee, Achyranthes bidentata Blume in Korea. At infraspecific level, uncertainty of identification showed that 41% of A. bidentata var. japonica and 28% of var. bidentata were misidentified, suggesting that the uncertainty level was independent of the reliability of experts' identification. For georeference specimen records, 71 specimens out of total 303 were selected and utilized as occurrence data: Uncertainty was 32.4 km at maximum and was 0.1297 km at minimum (mean = 4,055 m, s.d. = 5,772 m). Var. japonica is common throughout most of the southeastern Korea and west coastal areas, while var. bidentata has been found as far north as Gyeonggi and Gangwon provinces. We modelled the potential distribution of two varieties using Bioclim approach in Korea based on several environmental factors. Our results indicated the most important region for var. japonica lies the west coast ranges and southern area, while for Chungcheongnam-do of potential high diversity occurs for var. bidentata. This study shows that the major factors to determine the distribution patterns of two varieties were thermal factors, rather than precipitation. The Bioclim model using geocode and georeferencing data makes the information increasingly useful and reliable. To improve data quality, it requires full management from data collection to final databases including data cleaning.

• Journal of the Korean Geographical Society
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• v.32 no.4
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• pp.561-572
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• 1997

This paper attempts to analyze the changes of the contents in foreign area research carried out by Korean geographers, and discuss the task of the new regional geography in a global-local context. As compared with domestic area research, only a scant of foreign area research has been carried out. In the 1990's, the research interests are paid to how an open economy affects the regional economy, especialy the production technique, division of labor, industrial mix, market strategy, industrial location and organization, and so on. Unfortunately, however, the boundaries between economic geography and regional economy are gradully disappearing.