| With the development of China's space industry, the number of satellites in the orbit is increasing. The researchers often need to see a satellite coverage area at a particular moment, which requires a model to calculations the coverage area. With the number of satellites in orbit increases, the researchers acquired remote sensing data more and more. Vast amounts of remote sensing data are often controlled by different units, which face the problem of data sharing. With the emergence of Digital Earth, three-dimensional GIS is developing rapidly. The visualization of imaging data based on Digital Earth becoming a problem to be solved. This paper study the above issues.Firstly, Proposed a model to the problem of the satellite coverage area conducting. For the mass remote sensing image visualization problems, an analysis of NASA Wrold Wind system architecture and in-depth study of NASA World Wind of the map display program based on the mention of remote sensing image data multi-resolution slices, publish and display program. To address the flood of multi-source remote sensing image data-sharing problems in remote sensing image management, this paper introduced based on SOA (Service-oriented architecture, service-oriented architecture) framework to manage the datas, and use Web Service technology to achieve. The main contribution of this article with the innovations embodied in the following points:1. Satellite coverage area of remote sensing to model. Satellite coverage model for the Earth as an irregular sphere of influence on the coverage area, the first interception of satellite connection where the center of the earth plane, through the center of the earth, satellite, Satellite View and the ground constitute a triangle intersection, in order to use law of cosines to obtain Center for the vertex angle, in order to gain is the transfer point with the surface by (latitude) degrees. The model solves the sensor Earth observation satellites into the pupil side of the pendulum, before (after) tilt under the satellite coverage area calculation.2. Proposed display platform based on NASA WorldWind visualization of remote sensing program. First designed remote sensing image segmentation algorithm designed to deal with a single remote sensing image view object, its four-Cha tree-based multi-resolution segmentation of mention and tiles. Second sight and resolution under the World Wind World Wind for the relationship between the resolution of the hierarchy. Finally, World Wind sight and multi-resolution remote sensing image matching, according to the size of the horizon to judge World Wind distinguish grade level according to World Wind resolution remote sensing to obtain corresponding effects fitness tiles.3. Design ideas based on SOA architecture model of the satellite coverage area, and remote sensing data dissemination program to Tomcat for the server, the modeling of the satellite coverage area using WebService technology to WSDL as a communications carrier, achieved the release of the server service;-based WMS for Remote Sensing Image implementation using Java Servlet technology to achieve.Based on the above techniques and methods, independently designed and developed a prototype dissemination system. Practice has proved that this system to respond to the rapid and accurate. And has a flexible data query and interactive capabilities, to fully meet the geo-data online publishing service needs and based on NASA Wrold Wind product data for remote sensing image display requirements... |
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