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Progressive coding technology based on ROI can effectively improve network transmission efficiency of remote image and meet application demand for users to concern important region with a priority. This article firstly analyzes traditional ROI coding method based on bit plane shift, points out existent deficiency of such methods; then put forward a novel ROI progressive coding algorithm. Basic principle...
Because of the higher resolution, the data volume of remote sensing image is very large. To communicate and use them on network, efficient compression is very important. Based on the frame of conventional JPEG2000 compression, this paper puts forward a kind of modified compression algorithm aiming at characteristics that the correlation of remote sensing image is lower than common images. The core...
SOA is a service-oriented software architecture model, and it can support the transformation of geographic information software from “system and function” to “service and application”. This paper first analyzes the connotation, model structure and main features of SOA, then proposes the basic frame and service process of geographical information service based on SOA, and finally takes the “Yellow...
Vector map is an important and valuable information resource, which is a kind of basic data for many information systems related to spatial location, such as GIS, ITS, etc. To protect copyright of vector map, this article presents a digital watermarking algorithm based on double-grid, which hides watermark information into the least significant bit of node coordinates separately. Experiments prove...
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