In-Hak Joo

MPEG-7 metadata for video-based GIS applications

In this paper, we present a MPEG-7 metadata scheme designed for a video-based Geographic Information System (VideoGIS). Recently, VideoGIS have been developed for integrated management of spatial data such as map, 3D graphic, still image, and video to provide better and more realistic information of spatial objects. Main functions of VideoGIS are to calculate 3D geographic position of a spatial object and to search image and video that correspond to the object. In this paper, a MPEG-7 metadata scheme is proposed for emerging Location-Based Services (LBS), e.g., tourist information and restaurant reservation services, which becomes more and more popular in emerging mobile environments.

A smart web platform for telematics services toward ubiquitous environments

Abstract : Abstract This paper takes care of an evolution of web architecture for Telematics services on ubiquitous environments. Telematics has become one of upcoming convergence fields where many kinds of services are now be operated or planned to be launched. However, most of Telematics services are currently operated in a closed architecture: they require hardware and software configurations exclusively. In order to achieve ubiquitous capabilities in Telematics model, this paper proposes a web service platform for Telematics based on web service architecture. With the proposed Telematics service broker, service providers can register their services, and service consumers can find what services are available and how to use them. Adopting open architecture, the platform will contribute to efficient provision of Telematics services in upcoming ubiquitous environments.

Web services framework for geo-spatial services

In this paper, we propose a Web Service framework for four kinds of geo-spatial services of GIS, SIIS, ITS, and GNSS. First, we examine what requirements are needed when designing the framework for various kinds of geo-spatial services. Then, we show how the framework can contribute to efficient geo-spatial services on both wired and wireless environment. Main issues in a design of the framework are to define interoperable interfaces, to define standardized metadata, and to design efficient geo-spatial server for various kinds of geo-spatial services. The framework fundamentally adopts international standards such as WMS, WFS, WCS, and WRS announced by OGC. The adoption satisfies the interoperability, extensibility, and standardization of the framework. Especially, we focus on a design of main memory-based GIS server(MM server). The MM server can efficiently serve huge volume of GML documents via Web Service. And experimental results show the effectiveness of the framework and MM server.

A web services framework for integrated geospatial coverage data

This paper refers Web Coverage Service which provides geospatial data as Coverages that are geospatial information representing space-varying phenomena. It also takes care of Coverage Portrayal Service that defines a standard operation for producing visual pictures from coverage data. This paper proposes an interoperable and integrated coverage service. It takes international recommendations of coverage operations, WCS and CPS, on web environments and implements them in a single server system. For interoperability, it takes XML Web Services enabling cooperation of separate systems regardless of their platforms and languages. Through this paper, we are able to propose a prototype model for real geospatial services from an implementation viewpoint. It is expected that this endeavor can develop existing HTTP-based geospatial web services into XML Web Services, which enhances the Internet GIS services to give users fundamental benefits of ubiquitous accesses.

Generation of video metadata supporting video-GIS integration

Geospatial information expressed by video can provide more realistic and comprehensible information that cannot be obtained from digital map. We introduce video and integrate it to CIS by supporting video-map cross reference and bidirectional search. To support content-based search of geospatial objects appearing on video, we generate video metadata that has necessary information of geospatial objects. The most important part of the video metadata is outline of object on video frame. The outline of an object varies frame to frame, and thus should be generated for every frame in which the object appears. Because the object moves rapidly between video frames collected with 1-second interval, object tracking cannot be easily done by simple algorithm. In this paper, we devise a semi-automatic object tracking method by combining photogrammetric solution with image-based method.

Development of information platform server for telematics service provider

We proposed the Telematics Information Platform to manage the telematics contents with efficient performance in distributed environment. The Telematics Information Platform is middleware to offer a rapid essential telematics contents management, client connectivity, and communications. The telematics service providers can design and develop independently with telematics contents provider. It is useful for the telematics service provider to build telematics system under distributed environment. Keywords-component; Telematics, GIS, GDF, GML

Updating geospatial database: an automatic approach combining photogrammetry and computer vision techniques

In this paper, we suggest an automatic approach based on photogrammetry and computer vision techniques to build and update geospatial database more effectively. Stereo image or video is spotlighted as a useful media for constructing and representing geospatial database. We can acquire coordinates of geospatial objects appearing in image frames captured by camera with mobile mapping system, but quite a lot of manual input are required. We suggest a change detection method for geospatial objects in video frames by combining computer vision technique and photogrammetry. With the suggested scheme, we can make the construction and update process more efficient and reduce the update cost of geospatial database.

Improving the Quality of an R-Tree Using the Map-Reduce Framework

An R-tree is an index structure that enables fast access to multi-dimensional data. Constructing an R-tree for a given data set yields a more efficient R-tree structure than incrementally building one as data are inserted. However it usually takes a lot of time to construct an R-tree for a huge volume of data. In this paper, we propose a parallel R-Tree construction scheme based on a Hadoop framework. The proposed scheme divides the data into partitions, builds local R-trees in parallel, and merges them to construct an R-tree that covers the whole data set. While generating the partitions, it considers the data distribution so that each partitions have nearly equal amounts of data. Therefore the proposed scheme gives an efficient index structure while reducing the construction time.

Disposition of information entities and adequate level of information presentation in an in-car augmented reality navigation system

As Augmented Reality Navigation systems receive increasing attention as the next generation navigation systems, the importance of the layout of the elements and searching for the appropriate level of information cannot be overstated. Due to this, a series of experiments of usability tests had been designed. According to the experiments, the results for the screen arrangement showed that the MBN screen displayed on the left and the ARN screen on the right was preferred the most while the results for changing lanes showed that displaying information directly on the road and highlighting the path was the best method. As for switching direction, using the upper icons and displaying information directly on the road was preferred. The adequate amount of information was found out to be an average of 3 POI with 20pt font sizes for ARN displays and 10 POI with 18pt font sizes for MBN displays. Lastly, the Eye-tracking experiments showed that the ARN screen was viewed more often with a ratio of 7:3.

Fire Service in Korea: Advanced Emergency 119 System Based on GIS Technology

Fire service is one of the most important fields in e-government of Korea. In this paper, we introduce a pilot project for fire service currently operated at Daegu Fire Headquarter. For the project, we develop several components related to fire service and an emergency 119 system integrated with GIS technology. It supports information sharing between related organizations and mobile fire facility management. The system provides real-time information of fire service via Web. The developed system is efficiently used for fire extinction and rescue action, and will be also applied to other local fire service systems and extended to nationwide fire service system.