• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.223-223
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• 2020

하천 조사에 드론의 필요성은 점차 증가하고 있으며, 하천시설 조사 및 하천 물리량 간접 계측 등에 있어서 활용성 또한 증가하고 있다. 드론을 이용한 하천시설 및 하천 조사는 주로 광학 영상에 기초한 간접 계측을 중심으로 활발히 기술 개발이 진행되고 있으며, 최근에는 적용하는 임무장비를 확장하여 초분광카메리나 LiDAR 등을 활용하려는 시도가 활발히 이루어지고 있으며, 관련 기술의 개발도 역시 급격히 진행되고 있다. 이러한 기술 발전을 통해 하천 조사에 있어서 간접 계측의 정확도는 계속하여 증가하고 있으나, 기술의 편리성이나 활용성에 비해 정확도 향상에는 어느 정도 한계가 있으며, 간접 계측에 의한 정확도를 확보하기 위해서는 여전히 직접 계측 결과와 비교를 통한 검보정이 필수적이다. 직접 계측은 첨단 계측기를 사용한다고 하더라도 아직까지 인력에 의한 의존도가 높으며, 측정 효율이 여전히 떨어지고 있어 간접 계측의 편리성을 저하시키는 원인으로 작용하고 있다. 본 연구에서는 드론 기반의 간접 계측이 편리성 및 활용성, 정확도를 올리 수 있는 무인 IoT 수질 측정기를 개발하고자 한다. 무인 IoT 수질 측정기는 드론에서 측정한 자료 검보정 자료 획득을 목표로 하며, 드론으로 측정한 지역에 대한 데이터 검보정 정확도를 향상 시킬 수 있는 측정방안을 고려하고 있으며, 현재 이용 가능한 IoT 통신 모듈의 적용성 및 통신 거리를 고려하여 개발을 진행하고 있다. 특히 데이터 전송을 고려하여 개별 통신 규약 검토를 진행하였으며, 각종 표준을 검토하였다. 통신을 위한 전력 소모를 고려하여 저전력 통신 모듈을 중심으로 검토를 진행하였으며, 하천의 특성을 고려한 수질 측정 지점 결정을 위한 측정 알고리즘을 개발하여 적용하였다.

• Spatial Information Research
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• v.18 no.4
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• pp.1-11
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• 2010

Unlike the previous studies which have focused on 2-dimensional urban characteristics, this paper presents statistical models explaining urban heat island(UHI) effect by 3-dimensional urban morphologic information and addresses its policy implications. 3~dimensional informations of Columbus, Ohio arc captured from LiDAR data and building boundary informations are extracted from a building digital map, Finally NDV[ and temperature data are calculated by manipulating band 3, band 4, and thermal hand of LandSat images. Through complicated data processing, 6 independent variables(building surface area, building volume, height to width ratio, porosity, plan surface area) are introduced in simple and multiple linear regression models. The regression models are specified by Box-Tidwell method, finding the power to which the independent variable needs to raised to be in a linearity. Porosity, NDVI, and building surface area are carefully chosen as explanatory variables in the final multiple regression model, which explaining about 57% of the variability in temperatures. On reducing UHI, various implications of the results give guidelines to policy-making in open space, roof garden, and vertical garden management.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.6
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• pp.569-576
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• 2011

Recently the establishment of high accuracy 3D spatial information has been largely stimulated according to the increase in need of such 3D spatial information. In the fields of constructions and civil works, studies on increasing the productivity in these fields through converging them with other fields using the established 3D spatial information have been conducted. In such a tendency, BIM (Building Information Modeling) technologies have been rapidly applied to the fields of constructions and civil works. In particular, in the fields of constructions and civil works that represent a life span of plan-design-construction-maintenance, some BIM application methods and plans for the characteristics in each step have been proposed. Thus, the objective of this study is to simulate a project that is reasonable and can be optimized in connection with 3D spatial information and BIM technologies escaped from the conventional civil construction process that is based on empirical, statistical DB, and 2D information. For achieving this objective, 3D terrain data for the subject area engaged in this study using aerial photographs and airborne LiDAR was established. Also, a counter plan for the issues, which cannot be solved in the conventional methods for managing civil work projects, is applied through implementing bridge-based civil structure BIM by combining them with objective information.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.4
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• pp.724-729
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• 2008

In the case of 'MAEMI', the Typhoon which formed in September, 2003, the largest-scale damage of tidal wave was caused by the co-occurrence of Typhoon surge and full tide. Until now Korea has been focusing on the calculating the amount of damage and its restoration to cope with these sea and harbor disasters. It is essential to establish some systematic counterplans to diminish such damages of large-scale tidal invasion on coastal lowlands considering the recent weather conditions of growing scale of typhoons. Therefore, the purpose of this research is to make the counterplans for prevention against disasters fulfilled effectively based on the data conducted by comparing and analyzing the accuracy between observation values and the results of estimating the greatest overflow area according to abnormal tidal levels centered on Masan area where there was the severest damage from tidal wave at that time. It's necessary utilize data like high-resolution satellite image and LiDAR(etc.) for correct analysis data considering geographical characteristics of dangerous area from the storm surge. And we must make a solution to minimize the damage by making data of dangerous section of flood into GIS Database using those data (as stated above) and drawing correcter damage function.

• Journal of the Korean Association of Geographic Information Studies
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• v.21 no.4
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• pp.26-49
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• 2018

The purpose of this study was to verify the reliability of the solar radiation model and discuss its applicability to the urban area of Seoul for summer heat stress mitigation. We extended the study area closer to the city scale and enhanced the spatial resolution sufficiently to determine pedestrian-level urban radiance. The domain was a $4km^2$ residential area with high-rise building sites. Radiance modelling (SOLWEIG) was performed with LiDAR (Light Detection and Ranging)-based detailed geomorphological land cover shape. The radiance model was evaluated using surface energy balance (SEB) observations. The model showed the highest accuracy on a clear day in summer. When the mean radiation temperature (MRT) was simulated, the highest value was for a low-rise building area and road surface with a low shadow effect. On the other hand, for high-rise buildings and vegetated areas, the effect of shadows was large and showed a relatively low value of mean radiation temperature. The method proposed in this study exhibits high reliability for the management of heat stress in urban areas at pedestrian height. It is applicable for many urban micro-climate management functions related to natural and artificial urban settings; for example, when a new urban infrastructure is planned.

• Korean Journal of Remote Sensing
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• v.39 no.5_2
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• pp.743-754
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• 2023

The global occurrence of myriad natural disasters and incidents, catalyzed by climate change and extreme meteorological conditions, has engendered substantial human and material losses. International organizations such as the International Charter have established an enduring collaborative framework for real-time coordination to provide high-resolution satellite imagery and geospatial information. These resources are instrumental in the management of large-scale disaster scenarios and the expeditious execution of recovery operations. At the national level, the operational deployment of advanced National Earth Observation Satellites, controlled by National Geographic Information Institute, has not only catalyzed the advancement of geospatial data but has also contributed to the provisioning of damage analysis data for significant domestic and international disaster events. This special edition of the National Disaster Management Research Institute delineates the contemporary landscape of major disaster incidents in the year 2023 and elucidates the strategic blueprint of the government's national disaster safety system reform. Additionally, it encapsulates the most recent research accomplishments in the domains of artificial satellite systems, information and communication technology, and spatial information utilization, which are paramount in the institution's disaster situation management and analysis efforts. Furthermore, the publication encompasses the most recent research findings relevant to data collection, processing, and analysis pertaining to disaster cause and damage extent. These findings are especially pertinent to the institute's on-site investigation initiatives and are informed by cutting-edge technologies, including drone-based mapping and LiDAR observation, as evidenced by a case study involving the 2023 landslide damage resulting from concentrated heavy rainfall.

• Spatial Information Research
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• v.16 no.4
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• pp.411-420
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• 2008

To provide technological foundation for periodic and real-time land monitoring over the Korean peninsula where the land cover changes are prevailing, the Land Monitoring Research project was initiated as one of five core projects within the Intelligent National Land Information Technology Innovation Project operated by the Korean Land Spatialization Group (KLSG). This four year project can be categorized into two research themes with nine sub-projects. The first research theme is dealing with the real-time data acquisition from aerial platform and in-situ measurements by ubiquitous sensor network (USN), ground video camera, and automobile-based data collection systems. The second research theme is mainly focused on the development of application systems that can be directly utilized in several public organizations dealing with land monitoring over the nation. The Moderate Resolution Imaging Spectroradiometer (MODIS)-based land monitoring system that is currently under development is one of such application systems designed to provide necessary information regarding the status and condition of land cover in near real-time.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.413-413
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• 2020

Godunov형 모형을 이용한 홍수모델링에서는 일반적으로 구조적 사각격자나 비구조적 삼각격자가 주로 적용된다. 2차원 수치모형을 이용한 홍수모델링에서 연구유역의 정보가 격자의 노드나 중심에 입력되므로 적용격자의 유형과 생성방법에 따라 모형의 입력자료 오차에 영항을 줄 수 있다. 따라서, 연구유역이 지형 변동성이 심한 지역이거나 흐름형상이나 흐름변동이 심한 구간이라면, 고해상도 격자를 통해 모형의 입력자료 오차를 최소화할 할 수 있다. 본 연구에서는 2가지 유형에 대한 연구를 수행하였다, 첫 번째는 홍수해석을 위한 2차원 모형의 격자형상과 해상도에 따른 홍수위 및 홍수범람범위를 비교·분석하는 연구를 수행하였다. 연구유역은 2000년 10월 29일부터 11월 19일까지 홍수가 발생한 영국의 Severn 강 유역이다. 연구유역의 홍수 모델링을 위한 지형자료는 3m 해상도의 LiDAR(Light Detection And Ranging)를 이용하여 구축하였으며, 격자유형 및 해상도에 따른 2차원 홍수위 및 홍수범람범위를 비교·분석하기 위해서 홍수 발생기간 동안 촬영된 4개(2000년 8월 11, 14, 15, 17일)의 ASAR(Advanced Synthetic Aperture Radar) 영상자료를 활용하였다. 즉, ASAR 영상으로 촬용된 최대범람시기 및 홍수류의 배수기를 활용하여 최대범람범위뿐만 아니라 홍수가 증가하는 시기와 하류단 배수로 인해 홍수가 감소하는 시기를 모두 포함하는 홍수범람범위에 대한 격자유형별 2차원 홍수범람모형의 계산 결과에 대해 비교하였다. 두 번째는 아마존 강 중류유역의 2,500K㎡ 면적에 해당하는 대규모 유역에 대해 SRTM(Shuttle Radar Topography Mission) 지형자료를 이용하여 홍수기와 갈수기에 대해 2차원 모델링을 수행하고 그 결과를 위성자료와 비교하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.223-223
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• 2022

최근 도시지역의 홍수피해가 증가함에 따라 홍수방어대책이 중요해지고 있다. 제방 축조 및 배수시설 개선 등의 구조적 대책이 우선되어야 하나, 계획빈도 이상의 호우로 인한 피해 발생시 인명피해 및 재산피해를 최소화하기 위한 비구조적 대책 또한 중요한 실정이다. 본 연구에서는 도시지역의 비구조적 대책 수립을 위해 하천 제방 붕괴로 인한 홍수범람 해석을 수행하였다. 도시지역의 홍수범람 해석은 일반적으로 확산형의 흐름 특성을 가져, 홍수의 잠재성이 크다고 판단되는 도시지역에 대해 확산형 범람 해석을 통해 홍수의 전파양상을 심층적으로 검토할 수 있는 Flumen 모형을 적용하였다. "홍수위험지도 작성에 관한 지침(2020, 환경부)"에서는 2차원(확산형) 홍수범람 분석시 LiDAR 기반 1m급 DEM 자료를 권장하고 있으나, 영산·섬진강권역(제주도 포함) 내 1m급 DEM 자료는 약 11,320km²가 구축되어 전체면적(17,756km²) 대비 64%만 구축되어 도시지역 전체 적용에 한계가 있다. 본 연구에서는 도시지역과 농경지가 포함된 도시지역(농촌형 도심지역)을 대상으로 1m급 DEM과 5m급 DEM을 구분하여 2차원(확산형) 홍수범람 분석을 수행하였다. 도시지역으로는 지방하천 순천동천이 관류하는 순천시가지를 선정하였고, 농촌형 도심지역으로는 지방하천 광치천이 관류하는 남원시가지를 선정하였다. 2차원 홍수범람 해석을 위해 주요 지점별 파제 시나리오는 각 지구별 동일하게 작성하였으며, DEM 자료에 따른 검토 결과, 도시지역의 경우 지하차도 등과 같은 시설로 인한 차이가 발생하였으나, 농촌형 도시지역의 경우 DEM 해상도에 따른 침수양상 및 면적 차이가 크지 않은 것으로 검토되어 농촌형 도시지역의 경우 5m급 DEM 자료의 활용이 가능한 것으로 검토되었다. 추후 전국 지방·도시하천에 대한 홍수위험지도 제작이 완료된다면 홍수로 인한 침수피해에 대해 사전에 대비하고, EAP, 재해지도 제작, 수해방지대책 수립 등 관련 계획수립 시 기초자료로 활용이 가능할 것이다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.2
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• pp.67-74
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• 2018

This study has proposed a methodology to detect suspicious facilities that occupy national and public land by using the cadastral and digital maps. First, we constructed a spatial database of national & public land based on the cadastral maps by linking its management ledger. Using the PNU (Parcel Number) code as a key field, the data managed by different institutions are integrated into a single spatial information DB (database) and then, the use or nonuse state of each parcel is confirmed on the cadastral map. Next, we explored the suspicious facilities that existed in the unused parcel by utilizing the digital topographical map. Then, the proposed methodology was applied for various regions and tested its feasibility. Through this study, it will be possible to improve the utilization of digital maps and to manage the national and public land efficiently and economically.