• KSCE Journal of Civil and Environmental Engineering Research
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• v.14 no.2
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• pp.325-334
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• 1994

Modern society is the age of a high state of information and demands more effective land information. Moreover, because the use of land in Korea is intensive, Korea requires more synthetic and systematic geographical information for which the digitizing of terrain is prerequisite. This study aims at development of the data structure which is suitable to the digitizing of terrain for Geographical Information System(GIS). Regular grid has been used generally in Digital Terrain Model(DTM), for it is easy to manipulate. But regular cannot reflect well the terrain surface features. In the meantime, Triangulated Irregular Network(TIN) has complex data structure, but it can describe well terrain surface features and is useful in various applications. In this paper the method which constructs effective DTM by improving TIN has been researched.

• Journal of the Korean Institute of Landscape Architecture
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• v.24 no.1
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• pp.79-96
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• 1996

본 연구의 목적은 공간의사결정보조체계를 도시 시설중의 하나인 공원배분계획에 이용하여 현재 이용되고 있는 공원 배분 계획의 결점을 보완하는데 있다. 두 가지 요소 즉 이용자 행태 및 효율성과 형평성을 고려한 정책이 공원 배분계획에 주요한 역할을 하는데 본 연구에서는 효율성과 형평성을 중심으로 공원배분계획을 살펴 보고자 한다. 이를 위해서 지리정보체계를 이용한 공간의사결정보조체계가 이용되었는데, 이는 많은 양의 데이터나 계산을 물론 가중치, 계획 기준 등 변수를 변화시켜 봄으로서 여러 가지 대안을 쉽게 평가할 수 있어 공원배분계획에 도움을 주기 때문이다. 도시 공원을 위한 GIS 응용 공간의사결정보조체계의 유용성은 원형 연구를 통해 살펴 보았다. 원형은 여러 가지 유형중 도시 근린공원을 이용하여 도시 지역을 모사한 것이다. 원형연구에서 UPLDSS의 모델들이 다단계 및 다목적 계획을 잘 수행할 수 있음을 보여주었다. 즉, UPLDSS는 계획가가 계획 목적에 따라 여러 가지 다른 시나리오를 만들어 그에 따른 대안을 구축하고 평가하는데 도움을 줄 수 있다. 이것을 특히 계획가가 여러 가지 대안 중 어느 대안이 우수한지 쉽게 평가하기 어려울 때 계획가의 의사결정에 도움을 준다. 그리고 본 연구는 다른 위계의 공원 계획에도 이용될 수 있음은물론 다른 도시 시설물의 배치에도 이용될 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06c
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• pp.36-40
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• 2008

SIMS manages data for various spatial and non-spatial as integral management system to support space information administration environment and support several application works. Without being limited to spatial data that existent spatial Data Mining question language advances handling in this paper, did so that can find useful information from various data connected with automatically data collection, artificial satellite side upside service, remote sensing, GPS. Mobile Computing and data about Spatio-Temporal. Also, we designed spatial Data Mining query language that support a spatial Data Mining exclusive use system based on SIMS.

• Journal of Korea Spatial Information System Society
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• v.7 no.1 s.13
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• pp.25-37
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• 2005

Recently, with the development of wireless communications and mobile computing, interest about mobile computing is rising. Mobile computing can be regarded as an environment where a user carries mobile devices, such as a PDA or a notebook, and shares resources with a server computer via wireless communications. A mobile database refers to a database which is used in these mobile devices. The mobile database can be used in the fields of insurance business, banking business, medical treatment, and so on. Especially, LBS(Location Based Service) which utilizes location information of users becomes an essential field of mobile computing. In order to support LBS in the mobile environment, there must be an Embedded Spatial MMDBMS(Main-Memory Database Management System) that can efficiently manage large spatial data in spatial mobile devices. Therefore, in this paper, we designed and implemented the Embedded Spatial MMDBMS, extended from the HSQLDB which is an existing MMDBMS for PC, to manage spatial data efficiently in spatial mobile devices. The Embedded Spatial MMDBMS adopted the spatial data model proposed by ISO(International Organization for Standardization), provided the arithmetic coding method that is suitable for spatial data, and supported the efficient spatial index which uses the MBR compression and hashing method suitable for spatial mobile devices. In addition, the system offered the spatial data display capability in low-performance processors of spatial mobile devices and supported the data caching and synchronization capability for performance improvement of spatial data import/export between the Embedded Spatial MMDBMS and the GIS server.

• Journal of Korea Spatial Information System Society
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• v.7 no.2 s.14
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• pp.39-45
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• 2005

Nowadays, the demand of the output analyzed from the grid data have been sharply increased as the remote sensing technologies and GIS related industry have been developed. Therefore, a metadata access system which fits the requirements of the users should be developed for better managing and utilizing gridded data. In this background, this study defined a common application schema through the analysis of the metadata built by numerous institutes based on the draft metadata standards. The draft metadata standards has been proposed from the study supported by ETRI at 2003 which mainly concentrated on establishing the standards of distributing metadata for the grid data. Also, XML based integrated system was developed to access metadata maintained by SaTReC as well as SIMC to facilitate more convenient data access for the grid data users. The results of the pilot system developed from this study can be expected to contribute to build more efficient and enlarged integrated access system of metadata for grid data.

• Korean Journal of Agricultural and Forest Meteorology
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• v.23 no.3
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• pp.156-162
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• 2021

The number of smart farms has increased to save labor in agricultural production as the subsidy become available from central and local governments. The number of illegal greenhouses has also increased, which causes serious issues for the local governments. In the present study, we developed Mask-RCNN model to detect greenhouses based on satellite images. Greenhouses in the satellite images were labeled for training and validation of the model. The Mask-RC NN model had the average precision (AP) of 75.6%. The average precision values for 50% and 75% of overlapping area were 91.1% and 81.8%, respectively. This results indicated that the Mask-RC NN model would be useful to detect the greenhouses recently built without proper permission using a periodical screening procedure based on satellite images. Furthermore, the model can be connected with GIS to establish unified management system for greenhouses. It can also be applied to the statistical analysis of the number and total area of greenhouses.

• Spatial Information Research
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• v.17 no.1
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• pp.1-14
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• 2009

Demands for a system which enable users to retrieve any kind of geographic and regional information over the Web have been increasing. However, in order to obtain geographic or regional information over the web, users still need to search web pages related to region by inputting keywords and to arrange the searched results with map. We can solve that problem by using the fact that most of geographic and regional information contain geographic keywords related to location. In this paper, we propose a system to retrieve geographic and regional information efficiently. For the purpose, we present a conceptual model based on three layers of "Real-World", "Knowledge", and "Applications", from the web space and construct the above link process. These layers are connected to each other and enable users to navigation information over the linkage. Especially, users can obtain various correlated information about geographic information and properties.

• The KIPS Transactions:PartD
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• v.16D no.2
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• pp.177-184
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• 2009

Environmental monitoring systems are widely developed for analyzing environment and understanding an ecosystem according to the advance of wireless communication and various sensing techniques. To extract useful information, it requires high cost for processing a query, because these systems have to handle huge volume of raw sensor data which is transmitted from a wide area in environmental monitoring applications. Besides, it is also hard to answer an user defined query which requests to check current and near future condition. In this paper, we propose the monitoring system structure for processing a user defined query for environmental monitoring. It also describes the utilization of sensor data filtering and abstraction model. The designed abstraction model which is based on the slope grid in GIS supports fast data access and update. To analyze condition, the extracted data from abstraction model of each sensor type is combined in a query processor. It is useful to provide meaningful information to users.

• Korean Journal of Remote Sensing
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• v.26 no.2
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• pp.99-108
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• 2010

According to the recent trend on advancement of web computing technologies and diversification of spatial data types to be processed, designing and implementing of web-based applications using open sources has been regarded as one of important users-needs. In this study, a kind of geo-browser model composed of client-middleware-DBMS stack is suggested, and the prototype implementation are performed. Especially, modularization of user interfaces is contributed to increase both applicability for a certain target system and accessibility for web users. In middleware, it has functions to decrease erroneous factors on spatial data registration processes, and provides spatial data the form of OGC WxS standards. It is thought that this system is helpful to utilize as basic architecture and the related implementation model for web-based geo-spatial services and their applications.

• Ecology and Resilient Infrastructure
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• v.2 no.4
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• pp.324-329
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• 2015

For the restoration of lateral connectivity between rivers and floodplains, it is important to find the isolated former floodplain (IFF) and to characterize its land use in Korean rivers which were channelized by levee constructions for flood protection. The aim of this study is to map the IFF and to assess its land use pattern in the Nakdong River, Korea. The isolated former floodplain was explored by being overlapped on a digital elevation model (DEM), digital topographic map and design flood level using a geographical information system (GIS) in the Nakdong River basin. The land use of the identified IFF was classified by land-use map. The total number of IFFs was 384 and their total area was $291km^2$. While IFFs were usually surrounded by mountain forest in the upper river area, they tended to be located on wide plain areas in the downstream area of Nakdong River. The land use pattern of IFFs was mostly farmland (73.9%) and urban areas (12.7%) in the river. The results of delineation and land use analysis of isolated former floodplain in the Nakdong River will be used as a base line data for planning stream restoration.