ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.96

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractHYDROCAD (HYDROgraphic position fixing through AutoCAD) is a low-cost and powerful microcomputer-based hybrid digital processing system for conventional hydrographic surveys in near and inshore waters. The system was designed for implementing the digital hydrographic charts in AutoCAD, ade factostandard in microcomputer-aided design and drafting (microCAD) system in the engineering industry. Its purpose is to allow engineers ready access into the digital files for designs of near and inshore structures. Implementing the digital charts in AutoCAD integrates the activities of the hydrographic survey office and the engineering design office.HYDROCAD recycles the product life of existing analogue position fixing and echo-sounding systems.

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.97

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractThe coordinated local sphere is used for finding the geodetic coordinates of the spherical polygon vertices, within geodetic range, without utilizing the Gauss kilometrical coordinates.An adequate empirical compensation of the polygon vertices is also shown.

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.109

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractIt is common knowledge that if we level without error from a point A to another point B along two different routes, the two height differences thus obtained in going from A to B will generally not be equal. This lack of equality may be due to the effect of gravity on the levelling and any levelling not corrected for this effect will not always result in the actual height difference between the points. Furthermore, the effect is expected to show up as a systematic error in the circuit closures when the level network is computed.This paper examines the effect of the gravity correction in the circuit closures which arose in the Nigerian Levelling.

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.115

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractRedfearn's method for the Transverse Mercator projection is reduced by using spherical solutions to replace non elliptic terms.

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.125

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.134

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractSome methods providing the opportunity to obtain a star's altazimuth coordinates from non-current right ascension and declination are discussed.

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.135

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.140

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.141

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1989.30.233.142

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor