ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.2

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

摘要:

AbstractTwo methods of representing geodetic positions conformally as plane coordinates are discussed and compared with the method given in the Notes on Projection, now a classic, published by the Federal Surveys of Nigeria in the 1920s. Results show the existence of some systematic errors in the Nigerian system due to inadequacy of the formulae used. Now that Nigeria has gone over to the UTM system, it is recommended that plane coordinates be computed directly from original observations. These will also serve as a check on coordinates converted from the existing values.

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.3

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

摘要:

AbstractConsidering not only one variable–the distance–but also the pressure, dry and wet temperatures for each station respectively (for the above distance), an approach to the‘identification of outliers’problem in a sample of E.D.M. data is attempted with the help of an existing technique based on multivariate analysis.Several cases in this sample of measurements are examined and, by changing the number and/or the type of variables, the outliers obtained are generally different in each case.Although this paper reflects our first step in this direction, we think the method could be a useful tool (even more realistic) for the analysis of the behaviour of distance measurements due to the variation of pressure, temperature, humidity or any combination of these. Other fields also, such as the weather quality problem and E.D.M. or the influence of meteorology on geodetic refraction or the refractive index, are also considered interesting subjects to be investigated with the help of such a technique.

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.13

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.18

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

摘要:

AbstractThis paper presents a cpecklist for land registration purposes for less developed countries. It deals with adjudication, demarcation including cadastral mapping, improvement of registration of deeds systems, the implementation of registration of title systems and gives some guiding principles. These aspects are generally considered in the wider context of the place of the land registration system in the total land information system.

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.19

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.28

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

摘要:

AbstractRobust estimation methods are presented and applied, together with the conventional least squares procedure, to typical deformation models. The comparison of the results shows that the least squares method yields biased and in unfavourable situations even useless estimates if the mathematical model does not account for existing single-point displacements. A procedure of repeated testing and estimation is required to arrive at reasonable results. If in the same situation robust estimators are employed the final and complete result is attained unbiasedly in a single estimation step. A reliable separation of single-point displacements and the general deformation model is achieved without difficulties.

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.29

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.46

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.47

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1987.29.223.52

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor