The characters between scan map digitization and manual digitization are compared . the error sources of cadastral map digitization are analyzed . the error analysis and error distribution tests shows that the error in scan map digitization is almost the same as that in manual digitization 2 、对扫描数字化与手扶跟踪数字化的作业特点作了比较,分析了地籍图数字化的误差来源,扫描数字化的误差分析试验表明,对1 : 500的地籍图,扫描数字化的误差与手扶跟踪数字化的误差基本一致。
The main contents are as follows : ( 1 ) the measurement data processing theory and the design scheme of gps tunnel control network are introduced ; a wavelet analysis technique that can efficiently reduces the multi - path effects caused by tall buildings is presented ; finally , the factor sources of transfixions errors of underground tunnel and limit error distribution method which depends on unequal influence principle are proposed 具体研究内容如下: ( 1 )研究了遂洞gps测控网的布设、数据处理理论;探讨和研究了构筑物反射等产生的多路径效应的影响及应用小波分析理论有效减弱gps接收信号的多路径噪声的方法;讨论了地下隧洞贯通的误差来源及贯通误差的优化配赋方法。
Furthermore , according to the dynamic time - variant characteristics of manufacturing errors , a concept of dynamic manufacturing ability index is initiated for the first time . and on this basis , according to the principles of mathematical statistics and quality control , the relations between the dynamic - error distribution of some different manufacturing dimensions and corresponding manufacturing quality are individually analyzed , the relevant mathematical model is set up , and a critical value criterion for waste appearance is advanced 另外,根据加工误差动态时变的特性,首次提出了动态加工能力指数的概念,在此基础上,依据数理统计和质量控制的原理,分别研究了几种加工尺寸动态误差分布与制造质量的关系,建立了相应的数学模型,提出了废品开始出现的临界值判据。
In this study , two geometric correction methods are introduced . based on the characteristics of modis data , geo - location of the experimental area , and the error distribution patterns of different projections , we conclude that the albers conical equal area projection is feasible for the geometric correction 并对制作我国modis遥感影像图时的投影方式选取问题进行了讨论,通过分析modis数据的特点和用途、根据应用区域的地理位置以及各种投影方式的误差分布模式,确定在几何校正的过程中使用亚尔勃斯( albers )等积圆锥投影。