摘要:

AbstractThere are two main types of Right of Occupancy recognised in Nigeria. These are registered in adeeds registry., although title registration is applied to a very small area. The demand for Statutory R of O is increasing and is causing problems because of the survey methods used and also because of the lack of up to date cadastral control. Inventory and examination of control networks is being undertaken and some aspects of this work are discussed.

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.2

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe modulation frequency and additive constant of an electronic tacheometer Wild Tachymat TC 1600 were tested versus temperature and supply voltage. The differences between measured and predicted frequencies did vary by only±1.4 Hz (or±0.1 ppm) from the average difference across the entire temperature range from−10 to + 50°C. The variation of the additive constant over the same temperature range was very small (±0.23 mm) and statistically insignificant. No significant effects of supply voltage on frequency and additive constant were found. In addition, the additive constant was tested versus signal strength. Changes of 1 mm maximum were found at very low signal strengths creating scale errors of less than 0.5 ppm under field conditions. When establishing the frequency versus-temperature characteristics, full use was made of the accessibility of internally measured temperatures and internally computed predicted frequencies. Internal temperatures differ between 0 and + 11.5?°from ambient temperatures, depending on length of operation, previous temperature exposure and present temperature. The warm-up effects on the difference frequency and the additive constant were also insignificant with 0.2 ppm per 30 min and 0.24 mm per 100 min, respectively. Astandard deviation of a single TC 1600 distance observation ('DIST' mode) of±0.5 mm was found during laboratory tests. On an EDM calibration baseline, average standard deviations of±(0.4 mm + 0.4 ppm) were realized for means of 4–8 distance measurements. Short periodic errors were found to change with distance but did not exceed 1 mm amplitude.

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.9

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe vertical motions of 11 control points in the Northern part of Israel, Haifa North-East, were studied for a period of 1 full year (October 1988 to September 1989). In Israel control points on high tension poles are used as levelling bench marks. The purpose of this research was to determine the reliability of these control points as bench marks. A precise levelling network was established consisting of four levelling loops with the network being measured with an Zeiss Ni2 level equipped with a parallel plate micrometer. The total distance of the levelling network for a single run was 8.4 km. Four sessions were observed at 3.5 month intervals. As a result of the analysis, it was observed that the control points move in a cyclic manner with a nearly annual period.

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.25

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractExisting triaxial number theory is extended to the multiplication of two triaxial numbers as for classical vectors. Differential forms of triaxial numbers, products and transformations are examined. A proposal is made for the practical application of the algebra to a calculator or computer, and examples given.

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.34

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.54

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.57

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.58

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.59

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0039-6265    

DOI:10.1179/sre.1991.31.239.61

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor