参考椭球

本文以参考椭球面为边界研究变分情形下S-N类混合边值问题的适定性。

The proper determination of S-N mixed boundary value problem on the reference ellipsoid is studied in this paper .

尽管GPS能提供高精度的三维坐标，然而由于GPS测定的高程是相对于参考椭球面的大地高，而不是测量中通常所需要的相对于似大地水准面的正常高。

Although GPS can provide high-precision three-dimensional coordinates , but as a result of GPS elevation , its relative to the earth reference ellipsoid high , rather than high-normal is usually required in relation to the quasi-geoid .

不同参考椭球体的GIS数据转换探讨

Study on GIS data conversion of different reference ellipsoids

通过一项工程和不同参考椭球转换软件的实现过程，探讨了不同参考椭球GIS数据的转换问题。

The paper deals with the conversion of CIS data of different reference ellipsoids .

论文首先从椭球坐标的Laplace方程和常用的椭球谐函数出发，介绍了参考椭球面外调和函数的椭球谐级数展开。

Firstly , according to the Laplace equation of ellipsoidal coordinates and the ellipsoidal harmonic functions in common use , the ellipsoidal series expansion of harmonic functions outside the referential ellipsoidal is introduced .

随着GPS技术的发展，具有RTK功能的GPS接收机不但在平面位置上可以达到厘米级，而且以WGS84为参考椭球的垂直高程也可以达到厘米级，因而被广泛地应用于海岸带测量中。

Along with the development of GPS technology , the positioning precision of RTK GPS has achieved the order of cm both in horizontal positioning and in height based on WGS 84 system , so RTK GPS has been used widely in the coastal zone survey .

参考椭球面上的水平形变网平差

Adjustment of horizotal deformation network on the ellipsoid reference information

基于参考椭球面的陆海垂直基准统一的研究

The Research on Amphibious Vertical Unified Datum Based on Reference Ellipsoid Surface

试论选择地方参考椭球体长半径的合理公式

The choice of semi-major axis of local reference ellipsoid

第二，参考椭球的选择和定位；

The selection and orientation of the reference spheroid ;

并介绍了有关参考椭球面与大地高、大地水准面与正高、似大地水准面与正常高的概念。

And introduces reference ellipsoid and geodetic height , geoid and orthometric , like the geoid and normal height .

给定参考椭球体的四个基本参数，椭球体产生的外部正常重力位场可利用传统方法确定。

Given four basic parameters of a reference ellipsoid , the normal potential field generated by the ellipsoid could be determined by using conventional method .

为了解决地图制图中不同坐标系之间的相互转换的问题，采用构建通用地理坐标转换类方法，实现常用大地坐标系和平面投影坐标系之间在相同或不同参考椭球参数下的相互转换。

To solve the problems of difference geographic coordinates transformation , the paper adopts the methods of establishing general coordinate transformation class , and implements the coordinate transformation .

利用卫星测高数据解算的渤海平均海面高格网模型，进行参考椭球转换处理，将参考基准转换为海洋无缝垂直基准面（CGCS2000椭球）。

By means of satellite altimetry data to build Bohai Sea mean sea level grid modeling and converted reference ellipsoid to make reference datum to be seamless vertical datum ( CGCS 2000 ) .

坐标解算中，参考椭球的大小及定位、坐标转换参数的选择和确定、投影变形、高程系统等不可避免影响到库容的精度。

Coordinate calculation , scale and position of reference ellipsis , election and determination of coordinate transformation parameters , projection reformation and height system are main influences effects to accuracy of reservoir volume observed .

本文讨论了水平形变网在参考椭球面上的平差问题，以邢台地震区的水平形变网为例，说明在参考椭球面上作高精度水平形变网平差是可行的。

In this paper , the adjustment of horizontal deformation network on the ellipsoid is discussed , with an example of the adjustment of deformation network in the region of the Xingtai earthquake ( 1966 ) .

控制测量在数据处理时，通常要进行两次投影（地面→参考椭球面→高斯投影平面），也相应地产生两次投影变形，不利于大比例尺测图和工程施工放样。

When processing data in controlling survey , we usually project twice ( land surface → according to ellipsoid plane → gauss projection plane ) and it brings about Deformed projection twice too . It is not good for large scale mapping and setting-out of project construction .