铺就GIS全球化之路--解读g.net

介绍了g.net的体系结构,阐明了其特征和关键技术,以ArcGIS为例说明了它的具体实现,为实现地理信息和服务的全球化提供了可能.     

全新的GIS体系结构模式:g.net

.net是微软提出的新一代因特网模型，介绍了基于.net模型的全新GIS体系结构g.net，着重地阐述了g.net的关键技术XML,g.net的结构和g.net上的数据源，展望了g.net的应用前景。     

Geoenvironmental impact analysis of G.B. Pant Sagar reservoir (Rihand Reservoir), U.P. and M.P.

A comparison of aerial photointerpreted data around G.B. Pant Sagar (Rihand Reservoir) for pre-dam (1944) and post-dam (1967) periods and satellite imagery of 1988 shows that slope stability of the hills surrounding the reservoir has not been affected adversely as a result of impounding of the reservoir as no landslides are observed in the area in post-dam period. However, significant changes in the landuse of the area surrounding the reservoir are noticed in the post-dam aerial photographs and satellite imagery. Large areas show decrease in vegetation density as a result of deforestation while the areas bordering the reservoir show increase in vegetation density. The area under cultivation has decreased on the western side due to development of a number of coal fields in post-dam period. Improper management of coal ash disposal from a number of thermal power plants located around the reservoir is causing siltation of the reservoir.     

展望5G/6G时代的地球空间信息技术

随着通信技术的发展,5G/6G时代逐渐到来。在新的网络环境下,地球空间信息技术的发展也将催生新的发展趋势。文章首先对5G/6G时代进行了论述,分析其主要特点。然后阐述了5G/6G时代下地球空间信息技术的发展趋势(真三维实景模型的形成,地球空间信息处理的智能化和自动化,地球空间信息服务的社会化和大众化)。最后分析了新时代背景下我国自主的通导遥一体化空天信息实时智能服务系统建设的必要性;分析其发展路线(局域服务系统,区域服务系统,全球服务系统)和技术储备;对5G/6G、大数据和人工智能技术支撑下,我国地球空间信息技术的发展进行了展望。     

基于TM1300的G.723.1语音编解码器的实时实现

简要介绍了G．723．1编解码算法原理和TM1300定点DSP芯片，针对该芯片的硬件结构特点，设计了一套运行于TM1300之上的实时语音信号采集－编解码－播放的可行方案。讨论了G．723．1语音编解码器在定点TM1300上实时实现的关键技术及在具体实现过程中的问题，提出了相应的解决方法。试验结果表明，单片的TriMedia1300能实现至少5路实时G．723．1语音编解码。