• 자원환경지질
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• 제32권2호
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• pp.177-187
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• 1999

Gravity, magnetic and VLF surveys were conducted to investigat the structural stability and hazards associated with the Ubong landfill in Pohang City, which has been built to dump industrial wastes. In 1994, the collapse of a bank happened in the 6th landfill site due to sudden heavy rain, and a large quantity of waste materials flowed out to the nearby landfill sites, factories and roads. We used $10{\times}10m$ resolution DEM data for gravity reductions. The maximum variation of the terrain effect in the survey area is about 0.5 mgal and the terrain effect is large in the vicinity of bank boundary. The Bouguer gravity anomaly map shows the effect due to the variatino of thickness and type of waste materials. The small negative gravity anomaly increases from the 9th site to the 6th site. The small negative gravity anomaly of the 9th site reflects the relatively shallow dumping depth of average 14.5 m in this site and increased density of waste materials by the repeated stabilization process of soil overlaying. The 6th site is located at the center of the former valley and rainfall and groundwater are expected to flow from south-east to north-west. Therefore, considering the previous accident of mixing waste and bank materials at the north-west boundary of the landfill, there may be some environmental problems of leakage of contaminated water and bank stability. The complex inversion technique using Simulated annealing and Marquardt-Levenberg methods was applied to calculate three-dimensional density distribution from gravity data. In the case of 6th site, it is apparent that the landfill had been dumped in four sectors. However, most part of the 9th site and showed that high magnetic industrial wastes were concentrated in the 6th site. The result of magnetic survey showing low magnetic anomalies along the boundaries of two sites is similar to that of gravity data. The VLF data also reveals four divided sectors in the 6th site, and overall anomaly trend indicates the directio of former valley.

• 한국지반신소재학회논문집
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• 제18권4호
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• pp.87-95
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• 2019

토공량 산출은 건설현장에서 최적 공사비 산정을 위한 데이터로 정확한 토공량은 토목 공사의 설계 단계에서 시공단계까지 고려되어야 하는 중요한 요소이다. 토공량 산출을 위해서는 정확한 지형 자료와 정밀한 토공 부피 계산이 필요하다. 본 논문에서는 짧은 시간에 정확한 지형 파악이 가능하고, 경제성 측면에서도 장점을 갖는 드론 측량 기술을 이용하여 고정밀 토공량 산출 시스템을 도출하였다. 시스템의 정확도 검증을 위해 현장 검증시험을 수행하였으며, 드론을 이용한 토공량 산출 결과와 GPS 측량 장비를 이용한 토공량을 비교·분석하였다. 또한, 새롭게 개발한 토공량 부피 계산 알고리즘을 기존 항공사진측량 소프트웨어(Pix4D) 계산 방식과 비교하여 정확도를 검증하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.63-70
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• 2002

In tunnel construction, the information on the rock quality and the location of fault or fracture are crucial for economical design of support pattern and for safe construction of the tunnel. The grade of rock is commonly estimated through the observation with the naked eye of recovered cores in drilling or from physical parameters obtained by their laboratory test. Since drilling cost is quite expensive and terrains of planned sites for tunnel construction are rough in many cases, however, only limited information could be provided by core drilling Electrical resistivity and EM surveys may be a clue to get over this difficulty. Thus we have investigated electrical resistivity and EM field data providing regional Information of the rock Quality and delineating fault and fracture over a rough terrain. In this paper, we present some case histories using electrical resistivity and EM survey for the site investigation of tunnel construction. Through electrical resistivity and EM survey, the range and depth of coal seam was clearly estimated, cavities were detected in limestone area, and weak zones such as joint, fault and fracture have been delineated.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.443-446
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• 2007

The major purpose of the present study is to gauge the general applicability of cadastral surveying and LiDAR surveying. LiDAR survey is the method which obtains Geospatial information of the terrain. We will get a most topographic models at Digital Elevation Model(DEM) using LiDAR survey data. Also, we will consider both the surface parcel partition and volume parcel as a part of Geospatial relationship model. This study will focus on enhancing the efficiency and analysis of continual cadastral map and LiDAR DEM. I would like to close by proposing that LiDAR surveying will contribute in cadastral surveying.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.85-92
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• 2003

Application of traditional aerial survey technologies for topographic mapping purposes has a number of principal problems. The growing worldwide acceptance of digital orthophotos has understood this need. Many trekking and expedition teams are expecting digital orthophoto and consequently 3D animation of the highest peaks and possible trekking routes, camping sites and information on how difficult the routes may be. In recent years, inexpensive computers and advance of computer technologies contributed to the rapid development of digital photogrammetry (Dowman et al., 1992; Heipke, 1995). Successful implementation of digital photogrammetric workstations in mapping have been found in various disciplines (Chen et al., 1998; Skalet et al., 1992). This paper highlights the results of the conventional photogrammetry and the possible advantages of digital photogrammetry over these and also the problems, issues and implications during digital Photogrammetric processing of high mountainous region in Asia.

• 대한토목학회논문집
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• 제28권3D호
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• pp.407-415
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• 2008

본 연구에서는 도시하천의 수체적 계산에 이용되는 지형측량자료의 정확도 향상을 위해 영상정보를 연계하는 기법을 제시하였다. 먼저, 사주와 초지에 대한 지형을 구축하기 위해 횡단측량자료로부터 IDW와 크리깅과 같은 GIS 공간추정기법을 적용하였으며 생성된 지형의 정확도를 평가하기 위해 검정점 측량자료와 비교하였다. 비교결과, 사주에서는 2차 제곱의 IDW가 초지영역에서는 크리깅 구형모델이 하천내 지형구축에 효과적이었으나, 보간법간의 차이는 크지 않은 것으로 나타났다. 또한 하천에 분포하고 있는 사주와 초지에 대한 영역을 효과적으로 고려하기 위해 최소거리법을 적용하여 영상을 분류하여 Water Level Point의 수위값을 적용하였다. 사주와 초지영역을 영상정보로부터 추출하여 생성한 지형자료로부터 분석한 하천내 수체적은 영상정보를 활용하지 않은 기존의 지형에 비해 사주는 20%, 초지는 13%의 정확도 개선효과를 나타내었다. 따라서, 영상정보를 연계한 하천지형분석기법은 홍수시 댐하류에 분포하는 사주와 초지영역에 대한 모니터링 및 하천내 수체적 계산에 유용하게 활용될 수 있으리라 판단된다.

• 지질공학
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• 제17권1호
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• pp.49-55
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• 2007

전기비저항 탐사에 있어서 지하에 분포하는 이상대를 정확하게 파악하기 위하여 다양한 배열 방법들이 요구되어 진다. 탐사 방법들은 험난한 산악지형에서 지형기복에 따른 장비와 인력의 이동에 대한 불편함을 줄이기 위하여 일정한 고도에서의 곡선적 측선에 대한 탐사, 시추공이 경사 곡선 수평적으로 되어 있을 경우 지표의 임의적 위치에서의 탐사, 여러 개의 전류원에 대하여 임의 위치에서 포텐셜을 측정하는 탐사 등으로 분류된다. 본 연구는 이러한 다양한 배열 방법으로 얻어진 복합적 자료들에 대하여 3차원 역산 방법을 사용하여 보다 신속하고 정확한 영상들로 나타내고자 한다. 또한 단층지역에서 곡선적 배열 방법으로 얻어진 측정 자료에 대한 3차원 역산 결과로부터 단층의 경사, 방향 및 폭 등에 관하여 정확한 전기비저항 영상들의 비교 결과도를 제시하였다.

• 한국지역지리학회지
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• 제9권4호
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• pp.425-436
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• 2003

본 연구는 연안지역의 과학적이고 효과적인 개발, 보존, 관리를 위해 항해용 전자해도와 수치지형도를 통합한 통합수치도를 개발하기 위한 기술과 개발된 통합수치도의 활용방안을 모색하였다. 연구의 예비적 단계에서, 연안지역과 연안통합관리의 개념이 정리되었으며, 한극의 국립지리원과 국립해양조사원에서 제작된 국가 수치지도들의 구조적 차이와 특성이 파악되고 난 후, 수치지도들은 KVR-1000 고해상도 인공위성자료와 중첩되어 통합수치도로 제작되었다. 제작과정상에 발생된 해안선 오차를 분석하기 위해 부산광역시 서해안지역의 인공지형 2개 지역과 자연지형 지역 1개를 대상으로 전자해도와 육도의 매칭과 GPS 측량에 의한 해안선 불일치의 원인 및 차이를 분석한 후, 그 문제점 원인 및 해결방안에 대해 서술하였다. 또한, 본 연구에서는 제작된 통합수치도를 기반으로 연안통합관리에 필요한 다양한 응용방안 및 활용가치를 서술하였다.

• 한국환경과학회지
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• 제24권8호
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• pp.1003-1013
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• 2015

The Ministry of Trade, Industry and Energy is now placing emphasis on the importance of a new and renewable energy resource map service as an essential means of promoting the dissemination and adoption of renewable energy and other related industrial activities. To raise satisfaction with the new and renewable energy resource map service and promote its utilization, a survey was conducted on a sample group with an academic research background, i.e. employees of the Korea Institute of Energy Research (KIER) who have a thorough understanding of the technological concepts behind the new and renewable energy resource map. Statistical analysis of the survey results showed a high level of overall satisfaction with the web service for the new and renewable energy resource map. Therefore, it was concluded that the development of practical contents rather than the enhancement of web service convenience is required. A statistically significant trend was also observed whereby, the longer the professional career of the survey respondents, the greater their perception and utilization of, and satisfaction with, the enhanced service, which indicates that their level of understanding and utilization of technological concepts corresponds to their research experience record. In addition, the results obtained from the questionnaires regarding the evaluation of the utilization value of the resource map service indicated that use of the service was equally high in terms of political, business and academic applications. The results confirmed the need to develop multidimensional resource map contents that can be applied to as many fields as possible, rather than focusing on a specific terrain.

• 교육시설 논문지
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• 제21권2호
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• pp.25-32
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• 2014

Many Korean university campuses are located on hilly terrain where the hierarchy of the path system is unclear. Therefore, it is difficult to analyze the pedestrian network through space syntax, in which only horizontal direction changes are considered as depths of space. The purpose of this study is to compare pedestrian movement patterns and space syntax analysis in order to find their relevance to each other and the relationship between them. We conducted a survey regarding the most-visited buildings and pathways at S-University, which is located on a hilly area in Seoul. The survey results were compared with the Space Syntax integration map by regression analysis. For the segments where the relationship between pedestrian volume and integration was weak, field observations were conducted. As a result, topographical aspects, functional aspects, and location aspects were observed as the main influential factors. In addition, the research proposes that adding an extra axial line per vertical directional change can potentially compensate for the low relevance of stairs. This study suggests the possibility and the necessity of three-dimensional space syntax programs and emphasizes the importance of campus planning for the pedestrian environment.