Using Videoconferencing and Webgis to Support Distributed Concurrent Urban Planning Workshops

Leleito, Emanuel; Ohgai, Akira; Koga, Motoya

doi:10.3130/aijt.15.541

Cited by 4 publications

(2 citation statements)

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“…At present, the C/S architecture is mainly oriented toward a specific number of users, mainly concentrated in a local area network, which is difficult to use on a large scale. B/S is an improvement upon the C/S architecture and is the current development direction of the application system [53]. B/S has the advantages of convenient access, and users can view the geographic spatial data through a browser.…”

Section: Integration Of Video and Gismentioning

confidence: 99%

Real-Time Web Map Construction Based on Multiple Cameras and GIS

Zhang

Shi

Luo

et al. 2021

IJGI

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Previous VideoGIS integration methods mostly used geographic homography mapping. However, the related processing techniques were mainly for independent cameras and the software architecture was C/S, resulting in large deviations in geographic video mapping for small scenes, a lack of multi-camera video fusion, and difficulty in accessing real-time information with WebGIS. Therefore, we propose real-time web map construction based on the object height and camera posture (RTWM-HP for short). We first consider the constraint of having a similar height for each object by constructing an auxiliary plane and establishing a high-precision homography matrix (HP-HM) between the plane and the map; thus, the accuracy of geographic video mapping can be improved. Then, we map the objects in the multi-camera video with overlapping areas to geographic space and perform the object selection with the multi-camera (OS-CDD) algorithm, which includes the confidence of the object, the distance, and the angle between the objects and the center of the cameras. Further, we use the WebSocket technology to design a hybrid C/S and B/S software framework that is suitable for WebGIS integration. Experiments were carried out based on multi-camera videos and high-precision geospatial data in an office and a parking lot. The case study’s results show the following: (1) The HP-HM method can achieve the high-precision geographic mapping of objects (such as human heads and cars) with multiple cameras; (2) the OS-CDD algorithm can optimize and adjust the positions of the objects in the overlapping area and achieve a better map visualization effect; (3) RTWM-HP can publish real-time maps of objects with multiple cameras, which can be browsed in real time through point layers and hot-spot layers through WebGIS. The methods can be applied to some fields, such as person or car supervision and the flow analysis of customers or traffic passengers.

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Section: Integration Of Video and Gismentioning

confidence: 99%

Real-Time Web Map Construction Based on Multiple Cameras and GIS

Zhang

Shi

Luo

et al. 2021

IJGI

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“…The authors have been developing community scale WebGIS-based decision support systems coupled with simulation models such as fire spread and evacuation in crowded residential areas (Ohgai et al 2006, Leleito et al 2009). Based on the success of these systems in supporting participatory planning and increasing awareness among citizens on the community scale, the authors plan to expand these systems for use in supporting regional scale participatory planning processes through visualization and simulation.…”

Section: Strengths and Limitations Of The Acs Methodsmentioning

confidence: 99%

Approximating Inter-modal Travel Cost Using a Hierarchical Accumulated Cost Surface Method

Leleito

Ohgai

2010

Journal of Asian Architecture and Building Engineering

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An essential component of spatial analysis travel is often inter-modal and any surface such as the ground, air or water can be a travel path depending on the travel mode. Current geospatial software, while offering various procedures for complex computation of travel costs based on different factors, can however become quite cumbersome, inflexible and limited in meeting a researcher's needs especially when dealing with inter-modal travel. To more realistically capture this ground truth, simulation models need fast and efficient methods that take into consideration available travel modes rather than simple networks. An innovative approach for computing and visualizing optimal paths in inter-modal travel is proposed in this paper. A modified Accumulated Cost Surface method is used with several travel cost surfaces created based on the underlying topography and available modes of travel. Preliminary tests demonstrated a high level of success in computing travel time on actual road network data. This paper discusses the effectiveness and limitations of this method. Current findings suggest that this method might provide a convenient way for computation and visualization that is suitable for use in Web-based planning support systems.

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