Dr. Hengjian Tong Profile

Dr. Hengjian Tong

Associate Professor at China Univ of Geosciences

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Proceedings Article | 29 December 2008 Paper

3D remote sensing images data organization and web publication

Hengjian Tong, Yun Zhang, Zhenfeng Shao

Proceedings Volume 7285, 72853L (2008) https://doi.org/10.1117/12.815176

KEYWORDS: Image fusion, Three dimensional sensing, Remote sensing, Software development, 3D image processing, Image resolution, Computer programming, Earth sciences, Image compression, Earth observing sensors

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This paper presents a method on how to organize 3D remote sensing images and how to publish these images quickly. We use two levels of grid-based spatial index to organize massive images. First, we divide a huge digital city image into many map sheets (big images). All of map sheets construct a matrix structure. We use row number and column number to encode every map sheet. Second, by using resample and bilinear interpolation method, we build pyramid for every map sheet to form multi-scale hierarchical structure. At the same time building pyramid, we adopt JPEG compression technology to produce JPEG image format files. The number of output image files equals to the number of pyramid layers. Third, divide every pyramid layer image into many small image tiles. The size of each tile image is 256*256 pixels. All of small tiles of each pyramid layer image also construct a matrix structure. We also use row number and column number to encode every small image tile. We create a file directory for each map sheet in order to store all of small image tiles. we neatly combine the spatial index structure with the file name of each tile, which make server be able to return tile to browser side very quickly without any query operation. With the proposed method, we can provide users with a fast and efficiently tool to publish their own spatial information without involving any programming work. The system performance is very good and the response time is almost identical for different size images.

Proceedings Article | 11 November 2008 Paper

Distributed spatial information integration based on web service

Hengjian Tong, Yun Zhang, Zhenfeng Shao

Proceedings Volume 7146, 71462I (2008) https://doi.org/10.1117/12.813186

KEYWORDS: Web services, Information fusion, Geographic information systems, Databases, Computing systems, Information technology, Interfaces, Image registration, Data modeling, Internet

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Spatial information systems and spatial information in different geographic locations usually belong to different organizations. They are distributed and often heterogeneous and independent from each other. This leads to the fact that many isolated spatial information islands are formed, reducing the efficiency of information utilization. In order to address this issue, we present a method for effective spatial information integration based on web service. The method applies asynchronous invocation of web service and dynamic invocation of web service to implement distributed, parallel execution of web map services. All isolated information islands are connected by the dispatcher of web service and its registration database to form a uniform collaborative system. According to the web service registration database, the dispatcher of web services can dynamically invoke each web map service through an asynchronous delegating mechanism. All of the web map services can be executed at the same time. When each web map service is done, an image will be returned to the dispatcher. After all of the web services are done, all images are transparently overlaid together in the dispatcher. Thus, users can browse and analyze the integrated spatial information. Experiments demonstrate that the utilization rate of spatial information resources is significantly raised thought the proposed method of distributed spatial information integration.

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