• Title/Summary/Keyword: Geo-data

Search Result 1,227, Processing Time 0.035 seconds

Developing the Core Modules of for Viz-Platform for Supporting Public Service in the City (도시의 공공서비스 제공을 위한 시각화 플랫폼의 핵심모듈 개발)

  • Kim, Mi-Yun
    • Journal of Korea Multimedia Society
    • /
    • v.18 no.9
    • /
    • pp.1131-1139
    • /
    • 2015
  • The purpose of this research is creating the visualization platform of the user interface to make able to be provide the demanded service while users communication with surrounding space in a smart city environment. This comes from the latest enhanced interface technology and social media, and it uses the shares information to support the proper interface environment according to a life style and spatial properties. "EzCity" which is the user interface platform suggested in this research, can control the enormous amount of public data for the smart city. The core module of user platform is made up with Public data module, Interface module, Visualization module and Service module. The role of this platform is to be provide "Geo-Intelligent Interface Service" for space users to access the data in easier and more practical interface environment. This reinforces the visualization process for data collecting, systematization, visualization and providing service. Also this will be expected to be the base to solve the problem which complexity and rapidly increasing amount of data.

Flood Simulation by using High Quality Geo-spatial Information (고품질 지형공간정보를 이용한 홍수 시뮬레이션)

  • Lee, Hyun-Jik;Hong, Sung-Hwan
    • Journal of Korean Society for Geospatial Information Science
    • /
    • v.18 no.3
    • /
    • pp.97-104
    • /
    • 2010
  • The important factors in a flood simulation are hydrologic data (such as the rainfall and intensity), a threedimensional terrain model, and the hydrologic inundation calculation matrix. Should any of these factors lack accuracy, flood prediction data becomes unreliable and imprecise. The three-dimensional terrain model is constructed based on existing digital maps, current map updates, and airborne LiDAR data. This research analyzes and offers ways to improve the model's accuracy by comparing flood weakness areas selected according to the existing data on flood locations and design frequency.

A Study on GIS Metwork Security (지리공간 유통망 보안 방안에 관한 연구)

  • Kim, Ji-Hong;Lim, Gi-Uk
    • Journal of Korea Spatial Information System Society
    • /
    • v.3 no.2 s.6
    • /
    • pp.53-61
    • /
    • 2001
  • The GIS Network consists of the Clearinghouse Network Gateway and Clearinghouse Node and Geo-spatial Data Server. Recently with the development of Information and Network technologies, GIS Network should be needed to be more secure than ever. In this paper, we proposed the effective access control method for the distributed GIS network. PKI (Public Key Infrastructure) Technologies are used for access control and security for transmission on Geo-spatial data

  • PDF

The Design and Prototype Presentation of Web-based Geographic Information System for Irrigation Facilities (농업수리시설물의 웹 기반 지리정보시스템 설계 및 프로토타입 구현)

  • 고홍석;최진규;이정문;박순철;오동석;백영기
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.40 no.3
    • /
    • pp.54-62
    • /
    • 1998
  • This study is the part of development of information management system for irrigation facilities. It describes the design and prototype presentation of WISIF(Web-based geographic Information System for Irrigation Facilities). WISIF manages the IFDB(Irrigation Facilities DataBase) and offers geographic information of irrigation facilities from IFSDB(Irrigation Facilities Spatial DataBase) through World Wide Web. GeoMedia Web Map software of Intergraph is used to offer geographic information to users. GeoMedia Web Map generates vector format, so called ActivCGM. The file generated in ActiveCGM format can be downloaded fast since its size is so small and generated as an interactive map file since its format supports hyperlink.

  • PDF

2D Resistivity Modeling Including Tunnel (터널을 포함한 전기비저항탐사 2차원 모델링)

  • Kyeung, Keu-Ha;Cho, In-Ky;Kim, Ki-Ju;Jung, Jae-Hyeung;Bae, Gyu-Jin;Ahn, Hee-Yoon;Kim, Ki-Seog
    • 한국지구물리탐사학회:학술대회논문집
    • /
    • 2007.06a
    • /
    • pp.179-184
    • /
    • 2007
  • The electrical resistivity method has been widely used for the efficient maintenance of tunnel. In this case, the main purpose of the survey is to find out resistivity distribution around the tunnel. However, resistivity data are severely distorted by the tunnel, which make it hard to detect anomalous zones developed around the tunnel. In this study, using the finite element modeling, we analyze resistivity data distorted by the tunnel. Finally, we propose a simple method to correct the tunnel effect.

  • PDF

An Analysis for Urban Change Using Satellite Images and GIS (GIS와 위성영상을 이용한 도시의 변화량 분석)

  • Shin, Ke-Jong;Yu, Young-Geol;Hwang, Eui-Jin
    • Journal of the Korean GEO-environmental Society
    • /
    • v.6 no.4
    • /
    • pp.73-80
    • /
    • 2005
  • The domestic Remote Sensing field uses mainly Landsat TM image that is used to the monitoring of the wide area. In this study, it is analyzed the land cover change of rural and urban area by time series using satellite images and is proposed the vision for a urban balanced development. It execute an analysis for urban change which is a fundamental data of city planning through the integration of the spatial analysis technique of GIS and Remote Sensing using satellite data.

  • PDF

Development of Mobile 3D Terrain Viewer with Texture Mapping of Satellite Images

  • Kim, Seung-Yub;Lee, Ki-Won
    • Korean Journal of Remote Sensing
    • /
    • v.22 no.5
    • /
    • pp.351-356
    • /
    • 2006
  • Based on current practical needs for geo-spatial information on mobile platform, the main theme of this study is a design and implementation of dynamic 3D terrain rendering system using spaceborne imagery, as a kind of texture image for photo-realistic 3D scene generation on mobile environment. Image processing and 3D graphic techniques and algorithms, such as TIN-based vertex generation with regular spacing elevation data for generating 3D terrain surface, image tiling and image-vertex texturing in order to resolve limited resource of mobile devices, were applied and implemented by using graphic pipeline of OpenGL|ES (Embedded System) API. Through this implementation and its tested results with actual data sets of DEM and satellite imagery, we demonstrated the realizable possibility and adaptation of complex typed and large sized 3D geo-spatial information in mobile devices. This prototype system can be used to mobile 3D applications with DEM and satellite imagery in near future.

Geo-spatial Analysis of the Seoul Subway Station Areas Using the Haversine Distance and the Azimuth Angle Formulas (다트판형 공간분할 기법을 이용한 서울지역 지하철 역세권 분석)

  • Cho, Jae Hee;Baik, Eui Young
    • Journal of Information Technology Services
    • /
    • v.17 no.4
    • /
    • pp.139-150
    • /
    • 2018
  • This paper investigated the human distribution in subway station areas in Seoul, using geotweets and subway ridership data. Eight stations were selected from the districts of Gangnam and Gangbuk. Geotweets located within a 600-meter radius of the central coordinates of each station were extracted, and distances between the center of station and each tweet location were calculated. Donut-shaped dimension and pie-shaped dimension were generated, using the Haversine distance formula and the Azimuth angle formula respectively. By combining the two dimensions, Dartboard-shaped space division is created. Popular places within the subway station areas identified from this research are almost the same as the current well-known popular places, and this is an important case showing that people send tweets from various places where they engage in daily activities. We expect this study can be a methodological guideline for social scientists who use spatio-temporal or GPS data for their research.

A Terrestrial LiDAR Based Method for Detecting Structural Deterioration, and Its Application to Tunnel Maintenance (터널 유지관리를 위한 지상 LiDAR 기반의 구조물 변상탐지 기법 연구)

  • Bae, Sang Woo;Kwak, Jae Hwan;Kim, Tae Ho;Park, Sung Wook;Lee, Jin Duk
    • The Journal of Engineering Geology
    • /
    • v.25 no.2
    • /
    • pp.227-235
    • /
    • 2015
  • In recent years, owing to the frequent occurrence of natural disasters, the inspection and maintenance of structures have become increasingly important on a national scale. However, because most structural inspections are carried out manually, and due to the lack of objectivity in data acquisition, quantitative data are not always available. As a result, researchers are seeking ways to collect and standardize survey data using terrestrial laser scanning, thereby bypassing the limitations associated with visual investigations. However, field data acquired using a laser scanner have been required to measure changes in structure geometry resulting from passive deterioration. In this study, we demonstrate that it is possible to identify the processes of structural deterioration (e.g., efflorescence, leakage, delamination) using intensity data from terrestrial laser scanning. Additionally, we confirm the viability of automated classification of alteration type and objectification of the polygon area by establishing intensity characteristics. Finally, we show that our method is effective for structural inspection and maintenance.

Verification of GEO-KOMPSAT-2A AMI Radiometric Calibration Parameters Using an Evaluation Tool (분석툴을 이용한 천리안2A 기상탑재체 복사 보정 파라미터 검증)

  • Jin, Kyoungwook;Park, Jin-Hyung
    • Korean Journal of Remote Sensing
    • /
    • v.36 no.6_1
    • /
    • pp.1323-1337
    • /
    • 2020
  • GEO-KOMPSAT-2A AMI (Advanced Meteorological Imager) radiometric calibration evaluation is an essential element not only for functional and performance verification of the payload but for the quality of the sensor data. AMI instrument consists of six reflective channels and ten thermal infrared ones. One of the key parameters representing radiometric properties of the sensor is a SNR (Signal-to-Noise Ratio) for the reflective channels and a NEdT (Noise Equivalent delta Temperature) for the IR ones respectively. Other important radiometric calibration parameters are a dynamic range and a gain value related with the responsivity of detectors. To verify major radiometric calibration performance of AMI, an offline radiometric evaluation tool was developed separately with a real-time AMI data processing system. Using the evaluation tool, validation activities were carried out during the GEO-KOMPSAT-2A In-Orbit Test period. The results from the evaluation tool were cross checked with those of the HARRIS, which is the AMI payload vendor. AMI radiometric evaluation activities were conducted through three phases for both sides (Side 1 and Side 2) of AMI payload. Results showed that performances of the key radiometric properties were outstanding with respect to the radiometric requirements of the payload. The effectiveness of the evaluation tool was verified as well.