基于有理函数模型多源遥感数据网络服务设计

Design of Web Service Using Multi-original Remote Sensed Images Based on RFM and SVG

针对不同遥感数据校正方法不一致以及不同时相、载荷数据源间易失配等问题,提出了基于小波变换的快速匹配结果,解算卫星影像有理函数模型以自动建立一致成像几何模型的策略。进一步使用Oracle空间数据库进行数据层设计。根据遥感数据源数据量大、细节恢复度要求高的特点,且为兼顾传输效率,基于可缩放矢量图形格式进行栅格数据的压缩、传输及展示。经验证基于文中策略、多源遥感数据均能获得优于两个像素的高精度定位信息,可作为通用网络服务数据来源;Web服务客户端实现了实时对多源遥感数据的无缝浏览缩放、更新及缓存,保证了服务的实用性。

A strategy that automatically calculates rational polynomial coefficients （RPC） and establishes ima- ging geometry model with the results of fast image matching based on wavelet transform is proposed to deal with the complexity of different platforms, resolutions or time phases and possible mis-registration. The Oracle spatial data- base is employed to provide web services, and SVG to render data and response operations on web client side. Ex- periments shows that location data of high consistency can be achieved the proposed strategy for different remote sensed origins and can serve as a reliable source of web GIS system; by using SVG to transfer and render data of remote sensed data, the Web service achieves resolution independence scaling, browsing, updating or comparing on client-side.