| 1. | Height datum transference within long distance across sea
长距离跨海高程基准传递方法的研究 |
| 2. | Finally , the rule of geocenter motion is studied . and its effects on the height datum are also discussed in the dissertation
论文最后研究了地球质心的运动变化规律及其对高程基准的影响的有关问题。 |
| 3. | This dissertation presents the theory and method on the establishment of height datums . and some problems on the geocenter motion are also studied
本文系统地研究了建立高程基准的理论与方法、地心运动规律及其对高程基准的影响等有关问题。 |
| 4. | In fact , the transformation and unification of the local height datums have relations to the mean sea level variation at the shore where the tide gauges are located
局部高程基准的转换与统一，不得不涉及沿海各主要验潮站平均海平面的变化。 |
| 5. | Before the transformation and unification of height datums is made , it is necessary that different surfaces used for the definations of height datums should be introduced , and their relationships are also needed studying
在进行高程基准的转换与统一之前，介绍了高程基准的各种起算面及其相互关系。 |
| 6. | As for the transformation between the local height datums , three methods are summarized , which are the direct method , the indirect method and the coordinate transformation method . their respective application fields are also analysed
针对局部高程基准之间转换的不同情况，总结了三种转换方法：直接法、间接法和坐标转换法，并分析了各自的适用范围。 |
| 7. | First , the defmation and status of height datums is introduced and some problems on the local height datums established by the mean sea level , which is defined by the tide gauge data , are discussed . then the research progresses in recent years are analysed
首先介绍了高程基准的定义与现状，指出了用验潮站长期平均海平面建立局部高程基准所存在的问题；分析了当今国内外高程基准的研究现状；进一步明确了我国高程基准现代化的必要性。 |
| 8. | Due to the development of gps , which is representative of spatial geodetic measure technology , and the satellite altimeter technology , it is possible to unify the local height datums in different countries ( or regions ) to the world height datum ( whd ) . and the unification of height datums has been made in some countries
随着以gps为代表的空间大地测量技术以及卫星测高技术的飞速发展，使得将各个国家或地区的局部高程基准统一为全球高程基准成为可能，并且在部分国家已经实现，因此将我国高程系统纳入全球高程系统不仅具有理论意义，而且具有重要的现实意义。 |
| 9. | Then the origin vertical shift of cnhd85 with respect to whd is calculated from geopotentials . and the systematic difference and its distribution of cnhd85 is analyzed from the difference of height anomalies . at last , the systematic difference of the mean sea level at qingdao tide gauge is further testified from the sea surface topography model
然后基于位理论方法求出了1985国家高程基准点的垂直偏差，基于高程异常差分析了1985国家高程基准的系统差及其分布规律，最后基于海面地形模型进一步揭示了青岛验潮站平均海平面的系统差。 |
