摘要:

AbstractSection 1 of this paper appeared in the July issue of this journal. (Vol. 32, No. 249)

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.200

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

摘要:

AbstractA model for the establishment of an integrated geodetic datum covering a region is treated. The integrated geodetic datum is understood here to comprise the geoid, the reference ellipsoid, and the positional coordinates. A comprehensive unified solution model including the three parameters comprising the datum is considered. The estimation model adopted rigorously incorporates determined prior information in the estimation of the datum parameters. Mathematical models together with the pertinent observation equations are presented, followed by a description of the procedure for the actual setting up of the datum. The observational scheme is based on a system of modular traverses anchored on a trilateration of GPS baselines.

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.213

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

摘要:

AbstractAn iterative solution is presented to provide rapid computation, in a geocentric Cartesian system, of the coordinates of the projection of a fixed point on a topographic surface onto an ellipsoid of revolution.From the cofactor matrix of the geocentric Cartesian coordinates of such a point the cofactor matrix of the total vector of the coordinates of this topographic point and of the coordinates of the projection onto the ellipsoid is also derived in order to compute the ellipsoid height and the relative variance.

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.233

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.238

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

摘要:

AbstractThis paper demonstrates the internal relations of the error ellipsoid and error ellipses in a horizontal control network. The research indicates that principal component analysis may not directly represent the position error of control points. The difference between the directions of ellipsoidal principal components and those of the major axes of error ellipses may be significant. Therefore, when applying principal component analysis to a horizontal control network, special attention should be paid to this problem.

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.239

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

摘要:

AbstractSurveyors are familiar with the concept and application of a three-dimensional, orthogonal, rotation matrix (ORM). Its derivation and properties are widely known.However, when a number of rotation matrices, each with an associated set of covariances, must be multiplied together, then allowance must be made for the successive introduction of such errors, and the effect that this has on the covariances of the elements of the final rotation matrix, and its parameters.The author derives and describes the form of the resulting covariance matrix and gives an example of the use of such results.

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.244

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.248

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor

摘要:

AbstractThe series of articles byCol. Sir Charles CloseonA fifty-years retrospectcontinued from the previous volume right through 1933 and into 1934. This provides extensive human interest stories, and in particular the mention of Major Jervis is noted since he was at one time nominated as a possible Surveyor General of India in succession to Sir George Everest, but that did not materialise.

ISSN:0039-6265    

DOI:10.1179/sre.1993.32.250.249

出版商:Taylor&Francis    

年代:1993

数据来源: Taylor