Map digitizing data quality control method 地图数字化数据质量控制方法
Generally , digital data in blocks of fixed bit length is combined with a digital encryption key 一般而言,固定位长的字块中数字化数据是与数字密钥混合在一起的。
The error distribution in scan digitization may not obey the normal distribution , and is greatly affected by the systematic error 扫描数字化误差分布检验表明扫描数字化误差不一定服从正态分布,扫描数字化数据受系统误差的影响较大。
Based on the digitizing data of the land use map of the taiping st . area in wenling city between 1996 and 2001 , the characteristics of land use changes were analyzed 基于土地利用图的数字化数据,分析了1996 - 2001年温岭市太平街道土地利用的动态变化及其景观生态效应。
The results show that the correlation between digitized coordinates is obvious . therefore , in order to evaluate the accuracy of digitized data pertinently , it is necessary to process them by correlation adjustment 计算和分析表明,数字化坐标相关性较强,为合理评价数字化数据的精度,应该采用相关平差方法。
With the difficulty to segment badly - illuminated structured images , we proposed a method based on the characteristic of laser sheet , and also we proposed a method of how to prune the thinning curves with much spikes and branches 最终,我们获得了可用于cad cam的三维数字化数据。本文研究的方法和结论在类似的三维数字化领域也具有普遍的意义。
It is necessary to explore methods to find out interpolation points for processing of substantive and dense digitized data in an automatic manner . this dissertation presents two algorithms called as " quintic - curve - method " and " sixtic - curve - method " which are applied to automatically select nodes for quintic spline interpolation ( 3 )针对大量稠密数字化数据五次样条插值的需要,开发了两种插值节点自动选择算法:五次曲线法和六次曲线法。
In this paper , the theories and techniques of data quality control are thoroughly studied by taking pudong construction and management geographic information system ( js - gis ) , including error analysis and accuracy evaluation of digitized data , sample tests of housing surveying product , the principle and method of disfigurement measurement of attribute data based on sampling theories , and total quality control techniques of gis data . these methods are implemented in the construction of js - gis . the main contents are as follow : 1 本论文以浦东建设管理地理信息系统( js _ gis )为例对gis数据质量控制的一些具体内容进行了研究,包括数字化数据误差分析以及精度评定、房产测量成果的抽样检验、属性数据缺陷率度量的抽样原理和方法、 gis数据的全面质量控制方法,并将这些方法应用于js _ gis中,主要内容有: 1 、介绍js _ gis的系统组成,对js _ gis中数据的主要构成以及数据采集进行分析。