城市大比例尺航测成图质量评定     

胡景海  钟生伟 《地理空间信息》2008,6(1):121-123

主要从大比例尺航测成图质量评定角度出发,提出了既要满足相应规范和用户要求,又要最大限度的发挥航测成图的优势,对产品质量做出公正、客观、正确的质量评价方法。  相似文献   

A comparative error analysis of manual versus automated methods of data acquisition for algebraic strain estimation   总被引：1，自引：0，他引：1  

Kingshuk Roy Choudhury  Kieran Mulchrone   《Tectonophysics》2006,421(3-4):209-230

This paper presents a statistical analysis of the algebraic strain estimation algorithm of Shimamoto and Ikeda [Shimamoto, T., Ikeda, Y., 1976. A simple algebraic method for strain estimation from deformed eillipsoidal objects: 1. Basic theory. Tectonophysics 36, 315–337]. It is argued that the error in their strain estimation procedure can be quantified using an expected discrepancy measure. An analysis of this measure demonstrates that the error is inversely proportional to the number of clasts used. The paper also examines the role of measurement error, in particular that incurred under (i) a moment based and (ii) manual data acquisition methods. Detailed analysis of these two acquisition methods shows that in both cases, the effect of measurement error on the expected discrepancy is small relative to the effect of the sample size (number of objects). Given their relative speed advantage, this result favours the use of automated measurement methods even if they incur more measurement error on individual objects. Validation of these results is carried out by means of a simulation study, as well as by reference to studies appearing in previous literature. The results are also applied to obtain an upper bound on the error of strain estimation for various studies published in the literature on strain analysis.  相似文献   

SPOT5影像严格几何纠正方法研究   总被引：8，自引：1，他引：8  

宁晓刚  张晓东  胡进刚 《测绘信息与工程》2005,30(1):43-45

根据SPOT卫星的成像原理和特点,讨论了对SPOT5卫星影像按共线方程法进行有控制点的几何纠正的方法,经对关中、陕北和陕南三种地形的影像纠正结果进行对比检验,证明了该方法精度达到了较高水平。  相似文献   

GIS中直线元内插点精度及对误差带的影响   总被引：1，自引：0，他引：1  

魏峰远  邰茜 《测绘学院学报》2005,22(3):232-234

基于误差传播定律，考虑参数r误差影响，推导了线元内插点的精度计算公式，讨论内插点精度对线元误差带的影响，并对影响的结果进行了分析，得到了一些有益的结论。  相似文献   

基于点重要度的地形LOD简化算法及精度   总被引：1，自引：0，他引：1  

张寅宝王光霞  王国庆 《测绘学院学报》2005,22(4):281-284

在分析、讨论目前关于3维地形模型简化与误差控制方法的基础上,提出了一种基于点重要度进行连续LOD模型简化的算法.并以5种典型地貌的实验数据作为运行实例,给出了点重要度与地貌类型之间的精度关系.这为今后连续LOD模型的合理建立提供了一种新思路和方法,也为模型的简化提供了科学依据.  相似文献   

Relationship of Uncertainty and Line Segment for Between Polygon Segment Spatial Data in GIS     

LIU Chun TONG Xiaohua 《地球空间信息科学学报》2005,8(3):183-188

The mathematic theory for uncertainty model of line segment are summed up to achieve a general conception, and the line error hand model of εσ is a basic uncertainty model that can depict the line accuracy and quality efficiently while the model of εm and error entropy can be regarded as the supplement of it. The error band model will reflect and describe the influence of line uncertainty on polygon uncertainty. Therefore, the statistical characteristic of the line error is studied deeply by analyzing the probability that the line error falls into a certain range. Moreover, the theory accordance is achieved in the selecting the error buffer for line feature and the error indicator. The relationship of the accuracy of area for a polygon with the error loop for a polygon boundary is deduced and computed.  相似文献   

交互的初至波反演及静校正     

邹强  周熙襄  钟本善 《物探化探计算技术》2005,27(1):6-9

一种人机交互式的初至波反演方法是在反演过程中加入人为的干预,并利用人的经验控制反演的方向,使结果更加符合实际的地质情况。再将反演的结果与其它的短波长静校正方法相结合,就能够有效地提高静校正的精度。实例证明,这种方法是有效且可行的。  相似文献   

航空伽马能谱地形改正新方法及应用   总被引：5，自引：2，他引：5  

范正国  于长春 《物探与化探》2005,29(1):28-30,33

针对航空伽马能谱测量特点,推导了基于二维地形影响系数的航空伽马能谱测量地形逐点改正的理论公式。通过模型试验,总结了不同地形上不同飞行方式时的航空放射性异常特征,给出实测数据处理与野外异常查证对比结果,地形改正效果较好。  相似文献   

迭代折射静校正技术在鄂北地震资料处理中的应用     

许冬梅  曲安江  冯和平  闫立志 《物探与化探》2005,29(3):261-264

在低速层速度(地表直达波)已知的条件下,利用生产炮初至信息,用加权最小平方法和共轭梯度法建立的折射静校正数学模型,迭代求取长波长、短波长静校正量,在解决鄂尔多斯盆地北部的虚假小幅度构造问题及改善剖面质量方面取得了明显的效果。  相似文献   

GPS RTK技术及其在管线勘控中的应用     

宁卫远  焦利伟 《中国煤田地质》2005,17(6):61-63

针对GPS RTK技术应用中的工作条件、数据链传输、误差特性及质量控制等问题,结合管线勘控测量的作业特点,提出了提高RTK作业精度若干方法.  相似文献