• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.775-779
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• 2002

Currently, high-resolution satellite imagery such as KOMPSAT and IKONOS has been tentatively utilized to various types of urban engineering problems such as transportation planning, site planning, and utility management. This approach aims at software development and followed applications of remotely sensed imagery to transportation geographic analysis. At first, GDPA (Gradient Direction Profile Algorithm) and main modules in it are overviewed, and newly implemented results under MS visual programming environment are presented with main user interface, input imagery processing, and internal processing steps. Using this software, road network are automatically generated. Furthermore, this road network is used to transportation geographic analysis such as gamma index and road pattern estimation. While, this result, being produced to do-facto format of ESRI-shapefile, is used to several types of road layers to urban/transportation planning problems. In this study, road network using KOMPSAT EOC imagery and IKONOS imagery are directly compared to multiple road layers with NGI digital map with geo-coordinates, as ground truth; furthermore, accuracy evaluation is also carried out through method of computation of commission and omission error at some target area. Conclusively, the results processed in this study is thought to be one of useful cases for further researches and local government application regarding transportation geographic analysis using remotely sensed data sets.

• 한국ITS학회 논문지
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• 제20권1호
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• pp.132-145
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• 2021

본 연구는 효율적인 도로관리를 위해 이용자 중심의 핵심적인 도로망을 분석하고 개선 필요구간을 도출하고자 하였다. 기존의 도로관리는 혼잡을 바탕으로 한 관리자 중심의 다원화된 도로관리체계로 운영되어 왔다. 따라서 본 연구에서는 이용자 중심의 관점에서 여객이동, 물류이동, 관광이동 중심의 핵심도로망을 선정하였으며 서비스 수준(LOS) 분석, EPDO 사고율을 이용한 교통사고 안전성 분석, 네트워크 서비스 분석 등을 통해 개선 필요구간을 도출하였다. 이를 통해 핵심도로망 구축과 이용자 중심의 효율적인 도로 건설·관리체계 구축의 필요성을 강조하고 개선방안을 제시하였다.

• 대한원격탐사학회지
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• 제18권5호
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• pp.263-271
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• 2002

Recently, spatial information technologies using remotely sensed imagery and functionality of GIS (Geographic Information Systems) have been widely utilized to various types of transportation-related applications. In this study, extraction programs of some practical indices, to be effectively used in transportation reference planning problem, were designed and implemented as prototyped extensions in GIS development environment: traffic flow estimation (TFL/TFB), urban rural index (URI), and accessibility index (AI). In TFL/TFB, user can obtain quantitative results on traffic flow estimation at link/block using high-resolution satellite imagery. Whereas, URI extension provides urban-rural characteristics related to road system, being considered one of important factors in transportation planning. Lastly, AI extension helps to obtain accessibility index between nodes of road segments and surrounding district areas touched or intersected with the road network system, and it also provides useful information for transportation planning problems. This approach is regarded as one of RS-T (Remote Sensing in Transportation), and it is expected to expand as new application of remotely sensed imagery.

• Journal of Electrical Engineering and Technology
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• 제8권4호
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• pp.889-898
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• 2013

The shortest-path searching algorithm must not only find a global solution to the destination, but also solve a turn penalty problem (TPP) in an urban road transportation network (URTN). Although the Dijkstra algorithm (DA) as a representative node-based algorithm secures a global solution to the shortest path search (SPS) in the URTN by visiting all the possible paths to the destination, the DA does not solve the TPP and the slow execution speed problem (SEP) because it must search for the temporary minimum cost node. Potts and Oliver solved the TPP by modifying the visiting unit from a node to the link type of a tree-building algorithm like the DA. The Multi Tree Building Algorithm (MTBA), classified as a representative Link Based Algorithm (LBA), does not extricate the SEP because the MTBA must search many of the origin and destination links as well as the candidate links in order to find the SPS. In this paper, we propose a new Link-Based Single Tree Building Algorithm in order to reduce the SEP of the MTBA by applying the breaking rule to the LBA and also prove its usefulness by comparing the proposed with other algorithms such as the node-based DA and the link-based MTBA for the error rates and execution speeds.

• Journal of Forest and Environmental Science
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• 제32권1호
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• pp.1-9
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• 2016

Accessibility of urban green space, as an important index of evaluating the service level of urban green space, not only shows the resident's access to green space, but also reflects the environment quality of urban living. Since the quantity, area and space distribution of the patches in urban green space directly affect the function of urban green space and the quality of urban environment, the research on the accessibility of urban green space holds great significance to improve the service of urban green space and the living environment quality. Based on GIS software, this research uses the road network and the population distribution data of Nanjing's city proper to conduct quantitative analysis of the accessibility of park green space and the convenience for residents to travel under different forms of transportation. After the case analysis, the author tests the application of road network in studying the accessibility of urban park green space and proposes a GIS-based method to study the accessibility and the rational layout of urban green space.

• 대한원격탐사학회지
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• 제20권1호
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• pp.57-64
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• 2004

In GIS-based network analysis, topological measure of network structure can be considered as one of important factors in the urban transportation analysis. Related to this measure, it is known that the connectivity indices such as alpha index and gamma index, which mean degree of network connectivity and complexity on a graph or a circuit, provide fundamental information. On the other hand, shimbel index is one of GIS-based spatial metrics to characterize degree of network concentration. However, the approach using these quantitative indices has not been widely used in practical level yet. In this study, an application program, in complied as extension, running on ArcView- GIS is implemented and demonstrated case examples using basic layers such as road centerline and administrative boundary. In this approach, geo-spatial imagery can be effectively used to actual applications to determine the analysis zone, which is composed of networks to extract these indices. As the results of the implementation and the case examples, it is notified that alpha and gamma indices as well as shimbel index can be used as referential data or auxiliary information for urban planning and transportation planning.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권11호
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• pp.4483-4501
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• 2020

Recent findings identified the scatter and shape of MFD (macroscopic fundamental diagram) is heavily influenced by the spatial distribution of link density in a road network. This implies that the concept of MFD can be utilized to divide a heterogeneous road network with different degrees of congestion into multiple homogeneous subnetworks. Considering the actual traffic data is usually incomplete and inaccurate while most traffic partition algorithms rely on the completeness of the data, we proposed a three-step partitioned algorithm called Iso-MB (Isoperimetric algorithm - Merging - Boundary adjustment) permitting of incompletely input data in this paper. The proposed algorithm was implemented and verified in a simulated urban transportation network. The existence of well-defined MFD in each subnetwork was revealed and discussed and the selection of stop parameter in the isoperimetric algorithm was explained and dissected. The effectiveness of the approach to the missing input data was also demonstrated and elaborated.

• 한국빅데이터학회지
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• 제2권2호
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• pp.1-7
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• 2017

ITS(Intelligent Transport Systems)는 시민들의 교통이용 안전과 편의를 도모하고 교통 시스템의 효율적인 운영 및 관리를 위해 대도시를 중심으로 도입되었다. 우리나라의 경우 ITS가 전국적으로 확대되면서 도로소통상황, 교통량, 대중교통운영현황 및 관리상황, 대중교통이용현황 등 다양한 교통정보가 생성되고 있다. 본 논문에서는 ITS에서 수집되는 데이터 중 하나인 DSRC(Dedicated Short Range Communications) 빅데이터를 활용하여 도시 교통구조를 네트워크 분석 기법을 통해 규명한다. 이를 통해 도심에서의 복잡한 교통현상을 단순화시키고, 차량 흐름에 따른 도시 교통의 구조적 특징을 도출한다. 분석 결과는 도시의 교통을 좀 더 쉽게 이해할 수 있도록 도와주고, 향후에 도시교통의 혼잡 해소방안, 도로 확장 계획 등의 교통정책 수립시 기초연구 자료로 활용할 수 있다.

• 한국재난정보학회:학술대회논문집
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• 한국재난정보학회 2023년 정기학술대회 논문집
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• pp.259-260
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• 2023

The rapid urbanization and modernization observed in countries like Myanmar have led to significant concerns regarding traffic congestion, especially in urban areas. This study focuses on the analysis and revitalization of urban transport in selected areas of Myanmar. The core of urban transportation planning lies in travel forecasting, which employs models to predict future traffic patterns and guide decisions related to road capacity, transit services, and land use policies. Travel demand modeling involves a series of mathematical models that simulate traveler behavior and decision-making within a transportation system, including highways, transit options, and policies. The paper offers an overview of the traditional four-step transportation modeling system, utilizing a simplified transport network in the context of Mandalay City, Myanmar.

• 대한교통학회지
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• 제19권4호
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• pp.85-96
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• 2001

본 연구에서는 좌회전 금지 및 U-turn과 같이 회전제한이 있는 기하구조적 특성과 통행을 위한 시간창과 같이 특정 시간대에만 통행이 허용되는 가변적 특성이 부여된 도시도로망에서 기종점을 잇는 합리적인 최단경로를 탐색하는 문제를 다룬다. 본 연구의 동기는 지능형 교통시스템(ITS)의 응용분야인 첨단 여행자 정보시스템(ATIS)의 운영을 위해 필수적으로 요구되는 최단여행시간 경로를 탐색하고자 하는 문제에 의해서 유발되었다. 기하구조적 특성과 가변적 특성이 부여된 교통망은 도시도로망의 현실성을 보다 더 사실적으로 표현하지만 전통적인 알고리즘과 지금까지 개발된 알고리즘들은 가변적 특성이 반영된 최단경로를 탐색하는데 실패한다. 본 논문은 ATIS를 도시도로망에서 운영하는데 필요한 합리적인 최단경로 정보를 실시간으로 탐색할 수 있는 최단경로 알고리즘을 제안한다. 최단경로 알고리즘은 유전자 알고리즘 접근법을 이용하여 개발되었으며 모의실험에 의해 제안된 알고리즘의 우수성을 입증하였다.