半参数估计与LS估计的有效性比较

建立半参数回归模型,将系统误差加入,推导出了模型正则化矩阵时参数平差的计算方法,并用直接法得到了参数、非参数的估计量,在MSE准则下与最小二乘估值(简称LS估值)进行比较,证明了半参数估值的有效性。     

1：100万图号中行号、列号正误的快速判断方法

针对多个县(市)、区土地调查文字材料将1:100万图号中的行、列号用错而产生严重缺陷的事实,本人认真学习了"国家基本比例尺地形图分幅和编号"的基础知识,并总结归纳出简易的快速判断正误的方法,以杜绝类似差错的发生.     

引黄入晋工程的桩号系统设计与应用

对于象引黄入晋工程这样的由多个混凝土建筑物紧密且“硬性”衔接而成的,高精度、超长线路工程来说,村号系统设计是一个十分重要且具有实际应用意义的问题,为了避免高斯投影误差与高程投影误差对桩号的影响,解决桩号方面由此而引起的矛盾,以及满足工程远程运营管理对桩号的要求,作者提出了在工程的勘测设计、施工和运营管理等阶段中,应分别使用设计桩号、施工桩号和管理桩号,这３种桩号就构成了超长线路工程的桩号系统。文中     

Mapping for history: the influence of the 7th Field Survey Company’s 1917 operation maps on the historiography of the 3rd Battle of Gaza

ABSTRACT

During Palestine Campaign of World War I, the British Army’s Egyptian Expeditionary Force produced a series of operation maps to track and control the progress of their offensive into Palestine. These maps demonstrated innovation in both their form and function, and they have been referenced and reproduced by both map scholars and military historians ever since. Leaning on J.B. Harley and Matthew Edney’s ideas about critical map history, this essay provides a critical examination of these operation maps to illuminate the sociocultural context of their creation and examines the maps’ influence over the broader historiography of the Palestine Campaign. In doing so it highlights the interdisciplinary value of critical map histories.     

Android平台下的地形图图幅信息检索

针对当前移动端缺少快速、实时检索地形图图幅信息的系统,本文依据国家基本比例尺地形图分幅与编号标准,提出了基于Andriod平台的地形图图幅信息检索方法并编程实现了该系统。该系统实现的功能有:点所在图幅编号检索、图幅范围检索、地形图新旧编号的转换及区域范围内图幅编号集检索。此系统可应用于Andriod智能手机和平板电脑等移动设备。实验表明,本文的方法和系统执行效率能够基本满足移动用户实时检索地形图图幅信息的需求。     

改进的能量守恒方法及其在CHAMP重力场恢复中的应用

An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year＇s worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S.     

地球重力场模型在GPS高程测量中的应用

介绍了地球重力场模型（EGM2008）及其精度,对利用EGM2008模型进行GPS高程测量这一方法进行了探讨。在试验区内采用多种方案进行数据处理,结合试验区内的已有GPS水准点资料的情况进行了分析,通过对多种方案进行比较分析,得出了利用EGM2008模型进行GPS高程测量的精度与采用水准点的大致关系,为GPS高程测量提供一种新思路。     

A new technique to determine geoid and orthometric heights from satellite positioning and geopotential numbers

This paper takes advantage of space-technique-derived positions on the Earth’s surface and the known normal gravity field to determine the height anomaly from geopotential numbers. A new method is also presented to downward-continue the height anomaly to the geoid height. The orthometric height is determined as the difference between the geodetic (ellipsoidal) height derived by space-geodetic techniques and the geoid height. It is shown that, due to the very high correlation between the geodetic height and the computed geoid height, the error of the orthometric height determined by this method is usually much smaller than that provided by standard GPS/levelling. Also included is a practical formula to correct the Helmert orthometric height by adding two correction terms: a topographic roughness term and a correction term for lateral topographic mass–density variations.     

SAR图像海岸线检测的区域距离正则化几何主动轮廓模型

合成孔径雷达(SAR)卫星遥感图像可以极大地提高全国海岸线覆盖频率,然而受到海洋波浪所引起的随机海水表面粗糙度的影响,海岸目标与海水背景边界易混淆不清,因此本文提出了基于区域距离正则化几何主动轮廓模型(RDRGAC),引入距离正则项,解决重复初始化水平集函数为符号距离函数的问题,提高了算法收敛速度。此外,将区域面积项系数与SAR图像等效视数(ENL)建立非线性拟合关系,实现RDRGAC模型根据不同SAR遥感图像的自适应调整,改善海岸线自动提取精度。通过河北省北戴河和大连市金州湾SAR数据海岸线提取对比试验,验证了所提方法的有效性。     

对DMAPS野外采集程序的改进

随着数字化测图的开展和深入,安徽省测绘局DMAPS成图软件野外采集程序的原有功能已不能较好的满足数字化生产需求,但其本身和其它数字化成图软件的野外采集程序相比又有较多的优点,如加以适当改进,便能更好的适应数字化测图的需要,本文论述对野外采集程序加以改进的方法。