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As a new remote sensing technology, the global navigation satellite system (GNSS) reflection signals can be used to collect the information of ocean surface wind, surface roughness and sea surface height. Ocean altimetry based on GNSS reflection technique is of low cost and it is easy to obtain large amounts of data thanks to the global navigation satellite constellation. We can estimate the sea surface height as well as the position of the specular reflection point. This paper focuses on the study of the algorithm to determine the specular reflection point and altimetry equations to estimate the sea surface height over the reflection region. We derive the error equation of sea surface height based on the error propagation theory. Effects of the Doppler shift and the size of the glistening zone on the altimetry are discussed and analyzed at the same time. Finally, we calculate the sea surface height based on the simulated GNSS data within the whole day and verify the sea surface height errors according to the satellite elevation angles. The results show that the sea surface height can reach the precision of 6 cm for elevation angles of 55° to 90°, and the theoretical error and the calculated error are in good agreement. 相似文献
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通过对当前大比例尺地形图更新存在问题的分析,对测绘大数据时代的大比例尺地形图在数据采集手段、加强历史数据的挖掘和利用、建立地图综合缩编系统、开展城市地下空间测绘等4个方面进行了探讨,总结了测绘大数据时代的大比例尺地形图更新机制和技术方法。 相似文献
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传统的房产信息仍停留在属性数据库管理阶段,已不能适应现代房产业务的需求。本文基于天地图提供的二次开发接口,并充分应用天地图API接口技术、系统数据整合与关联技术、数据集成应用Mashup技术、房产专题数据库构建技术设计开发了房产信息系统,实现了地图浏览和房产信息查询等一系列功能,为房产管理提供了崭新的方式,取得了良好的应用效果。 相似文献
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