摘要:

AbstractThe simplest way to solve a large set of simultaneous linear equations is by the elimination method used in an orderly form attributed to Gauss [7]. It consists of an“elimination”process followed by“back substitution”. A new set of equivalent reduced equations is obtained at each step of the elimination by holding one equation of the set, called the“pivotal equation”, unchanged and adding suitable multiples of it to the following equations, so as to nullify the coefficient of one and the same unknown in each one of these. The elimination finally results in a set of reduced equations consisting of an upper triangular matrix of coefficients and a new vector of right-hand-sides.

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.194

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

AbstractMethods for fixing isolated points on to the national grid system, by observations of a few distances and angles, are discussed. There must always be one or two redundant measurements, to provide checks, but the desired positional accuracy for cadastral surveys can be obtained by semi-graphic methods or intelligent averaging of computed values, taking account of the relative probable errors of angles and distances. It is not necessary, in these simple situations, to use rigorous methods of adjustment under the principle of least squares.

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.206

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

AbstractThe gravity surveys carried out in Australia by the Bureau of Mineral Resources fall into three categories. They cover small areas for detail, large areas for reconnaissance, or are used to establish control points for surveys of a lower order of accuracy. Since 1959 the Bureau has used helicopters for reconnaissance surveying and this has enabled an annual coverage of areas as large as New South Wales on a grid pattern with a seven mile spacing of stations. In order to reduce the large amounts of data collected from the surveys to gravity, height, free-air and Bouguer anomaly values for the stations and to store the data in a convenient form, computer programs have been developed. The programs are written in Fortran and are used on CDC 3600 and 3200 computers. While the programs were developed for helicopter gravity surveys they are sufficiently general to be applied to all types of gravity surveys, and height surveys using barometers and a single base system. This paper presents the methods used in carrying out the surveys and reducing the data collected.

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.216

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

AbstractTo one who has attended several previous meetings in this series, the Commonwealth Survey Officers' Conference 1967 seemed different. And yet it was the same sort of light-hearted meeting of old and new friends, to talk shop, exchange gossip, and enjoy the Cambridge environment.

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.227

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.238

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.239

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1968.19.147.240

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor