Geodetic intersection on the ellipsoid

Through each of two known points on the ellipsoid a geodesic is passing in a known azimuth. We solve the problem of intersection of the two geodesics. The solution for the latitude is obtained as a closed formula for the sphere plus a small correction, of the order of the eccentricity of the ellipsoid, which is determined by numerical integration. The solution is iterative. Once the latitude is obtained, the longitude is determined without iteration.     

大地坐标系新探

论述了有关大地坐标系的几个问题,它们大都与国家大地坐标系有关;为了坐标系的维持与应用,提出2000中国大地坐标系应由至少2 000个国家级GNSS连续运行站和若干GNSS复测站的坐标和速度实现;认为大地参考架的更新周期取决于参考架的实现精度与具体应用的要求。为满足1∶1 000比例尺测图的需要,大地参考架的更新周期大约为30 a。同时还对"动态大地基准"的说法进行了评说。     

《大地测量术语》修订说明

1997年发布实施的《大地测量术语》(GB/T17159)在某些方面已经不能反映当前测绘生产活动的客观实际,需要修订。介绍了原标准及相关术语标准的概况,以及标准的修订原则。标准修订的主要内容包括修改标准文本体例,增加和删除某些术语和定义,调整某些术语的顺序,修正上一版标准原文及排版印刷中出现的错误,统一术语中涉及的外国人姓氏的拼写,以及修改某些术语的名称和定义等。     

Geodetic Publication Series

Geodetic Publication Series     

Geodetic publication series

Scientific Informations

Geodetic publication series     

空间大地直角坐标与大地坐标反算的非迭代法

介绍一种国外提出的由空间直角坐标 X ,Y,Z不需迭代 ,直接求解大地坐标 B,L,H的算法 ,给出了具体计算公式     

我国大地坐标系发展目标

详细论述我国大地坐标系的发展过程及存在的问题，提出现阶段我国大地坐标系应满足的条件和建立的坐标系的必要性，最后对改善和更新我国现有大地坐标系提出具体措施。     

Geodetic aspects of seismological phenomena

Seismology is related to many problems of geodesy. The energy production of our planet is rather close to energy consumption of the Earth so that the energy balance can be disturbed significantly by minor processes acting on global scale. From this point of view the effect of tidal triggering of earthquakes is discussed by the study of tidal stress tensor components expressed in spherical system of coordinates. Tidal friction influences through the despinning of the axial rotation the geometrical flattening. This flattening variation causes stresses along the longitude and this phenomenon is closely related to the seismic energy release. Until now there is no unambiguous success to relate changes of the Earth orientation parameters with seismicity. Present-day accuracy of the length of day variations is not sufficient yet to detect spin variation generated by the greatest earthquakes. The polar motion is probably more sensitive to earthquakes and then there is a chance to detect the polar displacements generated by seismic events. In the last section of the present contribution, the strain rates derived from the static seismic moments and from space geodetic observations are compared. Future geodetic strain rate data will be useful in earthquake prediction.     

论我国大地测量基础建设

概述了我国大地控制网、高程控制网和地球重力场等基础建设的基本情况、需求分析与任务建议。提出我国空间大地网应由连续运行参考站、一级网、二级网和三级网组成 ;一、二等水准网复测和高程基准再定义 ;为精化大地水准面 ,要补测重力点和加测GPS/水准点。