4.40. As a preliminary to several major survey projects, the main triangulation of the Colony was completely reobserved between October 1962 and February 1963 and work started on computation. By the end of the year it was clear that the result would be an overall improvement in the Colony Triangulation.
4.41. A contract was awarded for a large scale survey from aerial photographs. As a preliminary, Messrs. Hunting Air Surveys Ltd. carried out a comprehensive flying programme in January and February 1963.
Revenue Survey
4.42. Demands for Revenue Survey which deals with boundaries of lots for lease, surrender, reconstruction, regrant of lease, etc. continued to increase.
4.43. 1,327 new lots were set out, compared with 1,068 last year and 733 the previous year. 18 miles of buildings lines for 589 lots were checked, compared with 12 miles for 340 lots in the previous year.
4.44. Details of 235 lots were sent to the Registrar General for the issue of Crown Leases. 364 surrender plans were made and 661 boundary stones were fixed for 135 lots. 31 lots had their boundaries re-established.
4.45. At the end of the year 542 surveys for leases, 30 surveys for surrenders, 113 requests to set out boundaries, 7 requests to re-establish boundaries and 14 surveys for forthcoming sales were on the waiting list.
Triangulation and Traversing
4.46. 71 new triangulation stations were established and 53 miles of precise traversing were run to establish 974 permanent survey marks.
Levelling
4.47. 34 miles of precise levelling was carried out to establish 74 bench marks, and 34 miles of ordinary levelling to provide spot heights was completed.
4.48. Computations from the recordings of the automatic tide gauge at North Point showed the mean sea level for the year to be 3.88 feet above principal datum, compared with 3.91 for the previous year and 4.01 for 1959-60.
Page 29
Page 29
Page 29