用于应急三维GIS的DEM数据压缩方案  

Design and Realization of DEM Data Compression Based on the 3D Emergency GIS

作　　者：田继辉[1,2] 卢小平[2] 李英成 肖金城 王恩泉 冯琅 

机构地区：[1]中测新图(北京)遥感技术有限责任公司,北京100039 [2]河南理工大学矿山空间信息技术国家测绘局重点实验室,焦作454003

出　　处：《遥感信息》2011年第2期46-50,共5页Remote Sensing Information

基　　金：中国测绘科学研究院重大科技专项(7771016)

摘　　要：近年来,公共安全事件不断发生,如何科学地应对和及时妥善地处理突发事件是我国乃至全球必须面对的一个课题。而应急三维DEM可视化平台为这一课题提供了有效的解决途径。DEM数据作为空间数据中基础数据之一,但最新Lidar获取的局部数据,其数据量之大,无法快速地浏览与显示。针对于此,本文设计出DEM数据压缩方案,利用SevenZip结合Int5/3小波+SPHIT编码对其进行压缩,利用C#语言编程实现了该方案,并验证了该压缩方案的可行性及良好性。In recent years,as the incidents of the public safety frequently occur,how to reply scientifically and deal with the emergencies timely and proper has aroused wide concern in our country even all over the world.Luckily the research topic ＂3D DEM visualization platform of the emergency＂ provides an effective solution to this problem.DEM is one of the basic spatial data,however,the latest technology of the Lidar can obtain vast local data,but hardly to browse and display speedily.In light of this,the paper puts forward a design of compression scheme of the DEM data.Firstly,we can compress DEM data using SevenZip with Int5 / 3 wavelet and SPHIT encoding.Secondly,we realized this program using the C # language.Finally,the feasibility of the method was verified and the method worked well.

关 键 词：应急 三维GIS平台 Int5/3小波 SPHIT编码 SevenZip压缩 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]