• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.230-234
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• 2006

S-57 포맷으로 기술된 전자해도는 바다에 대한 디지털 지도로서 해안선, 수심, 항로표시 등과 같은 다양한 정보를 표현하고 있다. 이러한 전자해도는 주로 선박의 항해라는 특수한 목적으로만 사용되어 왔고, 전용의 시스템을 통해서만 이용할 수 있는 단점이 있다. 또한, S-57이라는 특수한 포맷으로 기술되어 있기 때문에 다양한 활용이 어렵다는 문제점을 가지고 있다. 이러한 전자해도를 손쉽게 이용하고 해양정보시스템의 기반 데이터로 활용하기 위해서는 범용의 표준 포맷으로 변환할 필요가 있다. 이러한 범용 표준으로 OGC(Open Geospatial Consortium)에서는 지리정보를 효과적으로 표현할 수 있는 XML(eXtensible Markup Language) 기반의 GML(Geography Markup Language) 표준을 발표하였다. 이에 본 논문에서는 선박의 항해에만 제한적으로 사용되던 전자해도를 손쉽고 다양한 활용이 가능하도록 GML로 변환하고 관리하는 방법을 제한한다. 즉, S-57 포맷의 전자해도를 GML 포맷으로 변환하고, 변환된 GML을 데이터베이스로 관리하는 시스템을 설계하고 구현하였다.

• Proceedings of the KSRS Conference
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• v.2
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• pp.768-771
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• 2006

In WSN(Wireless Sensor Network) environment, a large amount of sensors, which are small and heterogeneous, generates data stream successively in physical space. These sensors are composed of measured data and metadata. Metadata includes various features such as location, sampling time, measurement unit, and their types. Until now, wireless sensors have been managed with individual specification, not the explicit standardization of metadata, so it is difficult to collect and communicate between heterogeneous sensors. To solve this problem, OGC(Open Geospatial Consortium) has proposed a SensorML(Sensor Model Language) which can manage metadata of heterogeneous sensors with unique format. In this paper, we introduce a metadata model using SensorML specification to manage various sensors, which are distributed in a wide scope. In addition, we implement the metadata management module applied to the sensor data stream management system. We provide many functions, namely generating metadata file, registering and storing them according to definition of SensorML.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.4
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• pp.1015-1022
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• 2010

USN(Ubiquitous Sensor Network) environment that provides the service measured from sensors in real-time the information is delivered to application service. However, domestic service, application service provider environment between providers and users, most of the research are on the service platform architecture, and process the information detected by sensors between the providers of standard services platform architecture, which is a very weak level. In this paper, we proposed new service architecture though analysis of the OGC SWE(Sensor Web Enablement) with standards and research analysis of domestic standards. And we designed and implemented to each component of provider side.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.376-376
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• 2018

수재해 관련 정보를 수집하기 위한 주요 소스로서 위성 정보가 활용되고 있다. 본 연구에서는 그 중 NASA SEDAC과 UNISDR(United Nations International Strategy for Disaster Reduction)의 Global Risk Data Platform, UNESCO의 IHP-WINS를 대상으로 메타정보를 구축하는 [글로벌(위성기반) 수재해 관련정보 수집체계]를 구성하였다. 이때 메타정보를 수신/처리하는 역할의 하비스터는 OGC(Open Geospatial Consortium) 표준 WMS(Web Map Service)서비스의 필수 Operation인 GetCapabilities를 통하여 ISO GML을 획득한 후 이를 처리하도록 구성함으로써 여타표준 준수 DataSource에 대한 적응성을 확보하였다. 수집된 메타데이터를 통하여 검색된 정보는 표준 Map Service를 통하여 구글 지도 기반의 시계열 수재해 주제도 정보 서비스와 WebGL기반 3D 수재해 주제도 서비스로 각각 구성되도록 설계하였다. 국내 수재해 현장정보 수집 체계에 있어서는 사진을 포함한 시민의 현장 정보가 지오태깅기술과 동반되어 수재해 플랫폼으로 업로드 되면, 수집된 시계열 정보는 주제별 카테고리로 그룹화 된 후 클러스터링 가시화 기법으로 지도 공간상에 표출되도록 구성하였다. 이때 공신력 있는 공공 데이터(Data.go.kr)의 대피소 등 관련 시설 정보를 동시에 매핑하여 융합서비스 하도록 모색하였다. 본 연구는 전반적으로 웹서비스를 지향하며 전문가, 기관(부처), 교육기관으로 구분된 서비스를 구상하고 있다.

• Journal of Korean Society for Geospatial Information Science
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• v.10 no.4 s.22
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• pp.41-50
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• 2002

RPM is the one of the sensor models which is proposed by Open GIS Consortium (OGC) as image transfer standard. And it is the sensor model for end-users using IKONOS, a commercial pushbroom satellite, imagery which provide about 1m ground resolution. Parameters called RPC which is IKONOS RFM coefficients are serviced to end-users. But if some users try to make additional effort to get rigorous geo-spatial information, it is necessary to apply mathematic or abstract sensor models, because vendors don't offer any ancillary data for physical sensor models such as satellite orbit and navigation. Abstract sensor models such as pushbroom Direct Linear Transform (DLT) require many GCPs well distributed in imagery, and mathematic sensor model such as RFM, polynomials need much more GCPs. Therefore RPC modification using additional a few GCPs is the best solution. In this paper, two methods are proposed to modify RPC. One is method to use pseudo GCPs generated in normalized cubic, and another method uses parameters observations and a few GCPs. Through two methods, we get improvement of accuracy 50% and over.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.5
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• pp.379-387
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• 2006

The real world is spatially modelled conceptually either as discrete objects or earth surface. The generated data models are then usually represented as vector and raster respectively. Although there are limited cases where only one data model is sufficient to solve the spatial problem at hand, it is now generally accepted that GIS should be able to handle various types of data model. Recent advances in spatial technology introduced even more variety of heterogeneous data models and the need is ever growing to handle and manage efficiently these large variety of spatial data. The OGC (Open GIS Consortium), an international organization pursuing standardization in the geospatial industry. recently introduced the GMLJP2 (Geographic Mark-Up Language JP2) format which enables store and handle heterogeneous spatial data. The GMLJP2 format, which is based on the JP2 format which is an abbreviation for JPEG2000 wavelet image compression format, takes advantage of the versatility of the GML capabilities to add extra data on top of the compressed image. This study takes a close look into the GMLJP2 format to analyse and exploit its potential to handle and mange hetergeneous spatial data. Aerial image, digital map and LIDAR data were successfully transformed end archived into a single GMLJP2 file. A simple viewing program was made to view the heterogeneous spatial data from this single file.

• Journal of the Korean Association of Geographic Information Studies
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• v.19 no.3
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• pp.16-28
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• 2016

Advancing geo-spatial web technologies and their applications require compatible and interoperable heterogeneous browsers and platforms. Reduction of common or supporting components for web-based system development is also necessary. If properly understood and applied, OGC-based standards can be utilized as effective solutions for these problems. Thus, OGC standards are central to the design and development of web-based geo-spatial systems, and are particularly applicable to web services, which contain data processing modules. However, the application for OGC WPS 2.0 is at an early stage as compared with other OGC standards; thus, this study describes a test implementation of a web-based geo-spatial processing system with OGC WPS 2.0 focused on asynchronous processing functionality. While a binary thresholding algorithm was tested in this system, further experiments with other processing modules can be performed on requests for many types of processing from multiple users. The client system of the implemented product was based on open sources such as jQuery and OpenLayers, and server-side running on Spring framework also used various types of open sources such as ZOO project, and GeoServer. The results of geo-spatial image processing by this system implies further applicability and extensibility of OGC WPS 2.0 on user interfaces for practical applications.

• Spatial Information Research
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• v.21 no.1
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• pp.15-22
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• 2013

Recently, there are various attempts to construct a u-City and a smart city. A Spatial information as the city-based infrastructure has been recognized as an essential element. In many cases GIS data being lack of compatibility due to the various format, it is difficult to provide public web services and link the data between government organizations. In this study, we developed a interconnection Server based on OGC standardization to support interoperability in a heterogeneous distributed environment. we hope the interconnection server that will be utilized as u-City platform and response platform for volcanic disaster through the test in the test-bed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.1
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• pp.519-524
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• 2006

This paper describes an application of information presentation based geographic map for maritime information, including navigation information. The work is motivated by the need to prepare maritime information representation and distribution for future generation Web network technology. This works consist of map generation using GML and application to maritime information. GML 3.0 became an adopted specification of the Open Geospatial Consortium(OGC) in January 2003, and is rapidly emerging as the world standard for the encoding, transport and storage of all forms of geographic information. This paper looks at the application of GML to one of the more challenging areas of maritime information. Specific features of GML of interest to maritime information provider are discussed and then illustrated through a series of maritime information case studies. The first phase of the work consists of the construction of GML application schema for using as a base map of maritime information. Maritime information is acquired from multiple sources, including standards documents, database schemas, lexicons, collections of symbol definition. The sources of GML ontological knowledge and the contribution of each source to the overall ontology are described in this paper. In the second phase, the prepared GML is used to create a prototype of the mixed maritime information as a base map - for tagging documents within the maritime domain. An overview of this prototype is included. One application area for these information elements described here is the integrated retrieval of maritime information from diverse sources, ranging from Web sites to nautical chart databases and text documents.

• Journal of Korea Spatial Information System Society
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• v.9 no.1
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• pp.45-57
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• 2007

Recently, the development of sensor devices has accelerated researches on advanced technologies like Wireless Sensor Networks. Moreover, spatial sensors using GPS lead to the era of the Ubiquitous Computing Environment which generally uses spatial information and non-spatial information together. In this new era, a real-time processing system for spatial sensor data is essential. In this reason, new data processing systems called DSMS(Data Stream Management System) are being developed by many researchers. However, since most of them do not support geometry types and spatial functions to process spatial sensor data, they are not suitable for the Ubiquitous Computing Environment. For these reasons, in this paper, we designed and implemented a spatial DSMS by extending STREAM which stands for STanford stREam datA Manager, to solve these problems. We added geometry types and spatial functions to STREAM in order to process spatial sensor data efficiently. In addition, we implemented a Spatial Object Manager to manage shared spatial objects within the system. Especially, we implemented the Simple Features Specification for SQL of OGC for interoperability and applied algorithms in GEOS to our system.