导线网方差分量估计的综合研究

提出方差分量估计的多余观测分量平均匹配方式；总结出导线网方差分量估计定权的基本规律，并给出其权增量循环算法和特征根法以及将两个实对称矩阵同时对角化的实用方法。     

浅析边角精度匹配问题

根据横纵向误差来说明边角网中的匹配问题,并从传统的方法,最弱点的横纵向误差比,由平均必要观测数得出的横纵向误差比,平均多余观测分量比四个方面来进行边角相对匹配,然后考虑了边角匹配在地面控制网中的意义。     

综合多层优选尺度的高分辨率影像分割

采用面向对象方法处理高空间分辨率遥感影像时,影像分割质量对后续影像的信息提取结果影响很大。本文主要针对高分辨率影像分割中地物多尺度的问题,提出了一种基于多层优选尺度的高分辨率影像分割算法。该算法首先采用一系列规律变化的尺度对高分辨率影像进行多尺度分割,然后通过单分割层全局标准差的变化与尺度的关系确定一组最优分割尺度。在此基础上,通过各优选分割层之间的包含关系,局部建立多层次对象树,从整体上形成影像森林;通过局部同质性异质性综合评价指数的比较及父层光谱特征的限制来选取多层次对象树中的优势对象,从而获得最终的高分辨率影像分割结果。最后,本文分别采用了Geoeye和ZY3多光谱影像进行了2组分割实验,结果表明本文算法能有效地提高正常分割影像对象的比例。     

两种坐标系转换计算方法的比较

出于对目前常用的两种坐标系转换模型的学习和理解,对原本适合于小角度坐标转换的布尔莎模型进行了拓展,使其适合于任意角度坐标转换。将改进后的7参数布尔莎模型与13参数的大角度模型,结合盾构三棱镜法解算盾首盾尾坐标的工程实例,通过大旋转角和小旋转角两组数据以及编程实现两者的对比,并得出了结论。     

小波包分解树结点与信号子空间频带的对应关系及其应用

小波包变换的Mallat分解算法可以把较宽的信号频带划分成相等带宽且互不重叠的窄频带,但由于信号子空间频带的频率大小并非按照分解树结点（node）编号的大小顺序排列,各个结点重构信号的频率范围不易判定. 本文通过分析小波包变换的Mallat分解算法与分解滤波器的关系,设定频带编号与结点编号间进行二进制转化的运算规则,得到了小波包分解树结点与信号子空间频带的对应关系,然后通过模拟信号进行了验证. 结果表明,本文给出的小波包信号子空间频带的排列规则是正确的.      

Corresponding relationships between nodes of decomposition tree of wavelet packet and frequency bands of signal subspace

Mallat decomposition algorithm of wavelet packet transform can divide broader band into narrower ones with equal bandwidth and no overlapping each other. However, order by size of frequency within signal subspace is not in accordance with that of node label of decomposition tree. Therefore, it is not easy to determine frequency range of reconstructed signal from each node. In this paper, by analyzing the relationship between Mallat decomposition algorithm of wavelet packet transform and decomposition filter and setting operation rule of binary conversion of band labels into node labels, we find the corresponding relationships between nodes of decomposition tree and frequency bands of signal subspace. Then, the conclusion is verified by analog signals. Also, it shows that the ar- ranged rule of bands of signal subspace summarized in the paper is correct.     

新疆数字地震观测网络信息服务系统建设

论述了新疆数字地震观测网络信息服务系统的项目建设概况、目标、内容以及系统建成后的网络管理、数据库、信息应用服务和资源共享等平台的基本功能和发挥的效益.     

Comprehensive study on the estimation of the variance components of traverse nets

This paper advances a new simplified formula for estimating variance components,sums up the basic law to calculate the weights of observed values and a circulation method using the increaments of weights when estimating the variance components of traverse nets,advances the charicteristic roots method to estimate the variance components of traveres nets and presents a practical method to make two real and symmetric matrices two diagonal ones.     

The hypermedia data model based on the infinity image

This paper presents the hypermedia data model based on the infinity RS image information system we have developed.The hypermedia data model consists of different semantic units called nodes,and the associations between nodes are called links.This paper proposes three kinds of nodes (interior node,physical node and complex node) and two kinds of links (plane network structure link,hyper-cube network structure links).The hypermedia information system,based on the model and the basic data layer (the infiniy RS image),represents a digital globe.An approach to the "Getting Lost in the Hyper-space" problem is presented.The approach using the hypermedia data model is an efficient way of handling a large number of RS images in various geographical information systems.