ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.2

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

AbstractThe assumption of sensible temperature equivalence between the fluids of a binary hydrostatic line is examined. Errors in determining the difference in dynamic heights of the ends of the line, due to reasonable temperature differences between the fluids, are likely to be no greater than those resulting from errors in pressure measurement.

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.3

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

AbstractSeveral recent papers have dealt with various problems associated with perfectly static fluids in hydrostatic levelling systems. This paper examines the problems which can arise due to motions of the supposed“hydrostatic”fluids and indicates likely magnitudes of the effects of such motions. Steps which might be taken to reduce the significance of the consequent errors are also discussed.

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.15

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

AbstractThe determination of heights for vertical control purposes has been performed successfully by the hydrostatic technique many times in the past under conditions where the line was laid in a body of water with its ends at approximately the same level. The possibility of a more general application such as to the measurement of height differences under conditions in which the line is subject to variable and extreme environmental conditions is discussed. It is concluded that a hydrostatic heighting system might be developed capable of measuring, for example, height differences of up to 10m in hydrostatic lines up to 1000 m in length, with an accuracy of 1 nun or better.

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.23

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

AbstractSystems analysis is a proven technique of research which leads to a simplification of complex problems and an increase in understanding of fundamental principles It is a tool which has its own, at times confusing, jargon. This paper attempts to express in simple terms the ideas behind general systems theory and to indicate how, in the case of the cadastre, it can lead to an enhanced understanding of the subject.

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.28

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

AbstractResection can be used to measure the velocity of a glacier even where the co-ordinates of rock stations are unknown. The method is an adaptation of conventional semi-graphic resection and requires that the rock stations (targets) can be identified on a map. It can be extended to cover further points resected with the same targets even if there is no map. Stations whose velocities have been determined can then be used as control for detailed studies, thus avoiding the necessity to visit rock stations which, in rugged country, may be inaccessible.

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.33

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.45

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.47

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1979.25.191.i

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor