ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.290

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

AbstractThe intersection problem in triangulation is solved on the ellipsoid without mathematical approximations, using normal section azimuths. The solution is numerically stable in all practical cases. No restrictions are imposed on the sizes of triangles or the lengths of lines.

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.291

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

AbstractThe method of measuring lines in groups was applied in a survey of seven radial lines ranging in length from 32 to 93 km. Measurements made a month apart and adjusted to a common scale were totally consistent and agreed within 0.2 parts per million. These remarkable results encourage further studies in the applications of this method.

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.295

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

AbstractDetailed knowledge of the astrogeodetic geoid in Southern Africa is presently lacking. Asmoother representation of this geoid may be obtained by a suitable transformation of existingsatellite /gravimetric geoids. Of these, the most suitable is the Goddard Space Flight Centregeoid, which, referred to the Cape Datum, has an accuracy of about 5 metres.

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.303

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

AbstractA brief description of the operating principles and procedure for use of the AGA Geotracer digitising equipment is given. This is followed by a more detailed treatment of a straightforward user calibration technique. Finally, a theoretical error analysis of the instrument is attempted.

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.311

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

AbstractA screen is described that avoids direct observation of the sun. Sights may be taken to the centre of the sun. Times are taken using a Hewlett-Packard HP45 calculator as a recording stopwatch. The rate of change of altitude is measured as well as the altitude. Latitude, longitude and azimuth are then calculated. The sun does not need to be on the prime vertical.

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.323

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

AbstractSince 1977,The Star Almanac for Land Surveyorshas contained monthly sets of polynomial coefficients as an alternative to the main tabulation of sun and sidereal time data. The choice of Chebyshev polynomials, converted into simple polynomials, was considered to be convenient considering the number of coefficients required to be stored and the amount of calculation required of a person using a PPC (Acronym for programmable pocket calculator). A description of the construction and accuracy of these polynomials has been given by Sinclair (1975). Considering the advances which have been made in PPC technology, an alternative to the same main tabulation of The Star Almanac for Land Surveyors, based mainly on Fourier series valid for a year is advocated.

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.326

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.329

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.336

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1978.24.189.i

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor