�붯̬�������Ϣʱ����Ӧ���й��ִ���ػ�׼   总被引：8，自引：4，他引：4  

陈俊勇 《大地测量与地球动力学》2008,28(4):1-6

??????????????????????????????????????????????????????????й?????????????????????????????????????2008??7??1????????й???????????2000 (CGCS2000)?????????????????  相似文献   

������С���˷�������ά����ת���е�Ӧ��   总被引：9，自引：4，他引：5  

陆珏  陈义  郑波 《大地测量与地球动力学》2008,28(5):77-81

????о???????С???????????С????????????С????????????????е???????????????????????????????У??????????????????μ?????????????????????????????????С???????????????е????????A??????????b??????????????????????????????????????????LS????????????????С??????????????????????????????????  相似文献   

ˮƽ���׼ϵͳ���Զ���ƽ�����о�   总被引：1，自引：0，他引：1  

欧同庚  王琪  傅辉清  路杰  陈志高  杨博雄 《大地测量与地球动力学》2008,28(5):129-132

?????????????????????????3????????????飬??4????????????????????????????????????·????  相似文献   

城市邻近基站间人群流动时空变化同步性分析     

朱菁玮  方志祥  杨喜平  尹凌 《地球信息科学学报》2018,20(6):844-853

不同区域人群流量随时间的变化可以反映城市结构的空间差异。现有对于城市人群空间分布特性的研究大都以人群密度计算为基础,注重时空切片尺度,但是不能有效刻画邻域空间单元间流量变化的时空过程同步特性。本文提出一种基于基站间流量变化过程相似度的城市邻域基站流量变化同步性度量方法,量化分析不同区域的人群进出流量过程的相似程度,研究城市中具有相同人群流量变化过程的同步性区域空间分布规律。以深圳市为例,对城市同步性区域的空间分布与特点进行剖析。实验发现：计算同步性时参数选择需根据城市本身基站分布及流量特点分析,一般研究中,城市基站平均距离可作为邻近区域半径d,描述基站间流量变化相似度的特征阈值λ选取与邻近区域半径有关,半径越小,阈值取值越小。通过基站人群流量同步性得到的城市同步区域的空间分布不同于行政区域划分结果,同步区域面积小,划分更为精细;且规划级别越高的中心区,其范围内基站同步区域数目越多。最后,将同步区域结果与流量密度图对比,发现该方法不仅能够发现流量变化大的同步区域,并且能够发现城市中流量变化小的同步区域。本文提出的方法能量化衡量区域流量变化同步性并发现具有不同流量变化特点的同步性整体区域,对城市人群空间变化特点进行分析,可用于指导和评价城市规划与实际人群活动区域效果,以及城市服务设施布局等。  相似文献   

加权整体最小二乘的验后估计在三维坐标转换中的应用     

王祝安  陈义  毛鹏宇 《大地测量与地球动力学》2018,38(2):216-220

在求解三维小角度坐标转换EIV模型的过程中,顾及到两套坐标系下点坐标初始单位权方差可能不同导致定权不准确的问题,应用Helmert方差分量估计方法,对加权整体最小二乘的随机模型进行验后估计,从而重新分配观测向量和系数矩阵的权,使得解算模型更加合理。算例证明,利用该方法求解坐标转换参数的精确度有所提高,参数估值更接近真值。  相似文献   

基于全球潮汐模型的东海海域潮汐性质空间分布     

邬红涛 《海岸工程》2021,40(4):269-276

利用全球潮汐模型FES 2014(Finite Element Solution 2014)空间分辨率为(1/16)°×(1/16)°的网格点处13个分潮调和常数,借助基于最小二乘法调和分析方法和潮汐特征值的定义算法,定量分析东海海域(117°～131°E,23°～33°N)的潮汐类型、深度基准值和不同潮差类型.结果表...  相似文献   

Height datum unification between Shenzhen and Hong Kong using the solution of the linearized fixed-gravimetric boundary value problem   总被引：4，自引：0，他引：4  

Liming Zhang  Fei Li  Wu Chen  Chuanyin Zhang 《Journal of Geodesy》2009,83(5):411-417

The paper proposes a new algorithm to unify height datums in different regions, which is based on the solution of the linearized fixed-gravimetric boundary value problem. Compared with traditional methods, this method uses GPS ellipsoidal height and gravity disturbances on the surface of the earth to obtain a quasigeoid, which is not related to any local vertical datums. As an example, we calculate the height datum difference between Shenzhen and Hong Kong by applying this new method. The result shows that the height difference obtained by this new method is consistent with the ground leveling result to a few centimeters.  相似文献   

Fitting gravimetric geoid models to vertical deflections   总被引：2，自引：2，他引：0  

W. E. Featherstone  D. D. Lichti 《Journal of Geodesy》2009,83(6):583-589

Regional gravimetric geoid and quasigeoid models are now commonly fitted to GPS-levelling data, which simultaneously absorbs levelling, GPS and quasi/geoid errors due to their inseparability. We propose that independent vertical deflections are used instead, which are not affected by this inseparability problem. The formulation is set out for geoid slopes and changes in slopes. Application to 1,080 astrogeodetic deflections over Australia for the AUSGeoid98 model shows that it is feasible, but the poor quality of the historical astrogeodetic deflections led to some unrealistic values.  相似文献   

Die Hadamard-Konstruktion Greenscher Funktionen auf gekrümmter Raum-Zeit: Physikalische Zusammenhänge und explizite strenge Resultate     

R. W. John 《Astronomische Nachrichten》1987,308(1):9-26

First, in connection with their construction due to HADAMARD, the mathematical and physical meaning of covariant Green's functions in relativistic gravitational fields - according to EINSTEIN: on curved space-time - is discussed. Then, in the case of a general static spherically symmetric space-time the construction equations for a scalar Green's function are cast into symmetry-adapted form providing a convenient starting point for an explicit calculation of the Hadámard building elements. In applying the obtained basic scheme to a special one-parameter family of model metrics one succeeds in advancing to the explicit exact calculation of tail-term coefficients of a massless Green's function which are simultaneously coefficients in the Schwinger-De Witt expansion of the Feynman propagator for the corresponding massive Klein-Gordon equation on curved space-time.  相似文献   

ŷ��Walferdange���������DZȶԹ۲�   总被引：6，自引：3，他引：3  

邢乐林  申重阳  李辉  O.Francis 《大地测量与地球动力学》2009,29(3):77-79

????2007??11????????Walferdange???????ξ????????????????????????????????????????????20???????????μ?????????ECGS??15??????????????????С??2.1??10 ^-8 ms ^-2??  相似文献