Air Photography for New Roads in the New Territories
5.32. Advantage was made of the presence of the aircraft to have low-level photographs taken of many possible new road alignments in the New Territories, so that in future, if and when surveys are required for these routes, strip-maps can be prepared quickly and economically for location purposes and for computation of earthworks.
New Series of Topographical Maps
5.33. Discussions were held with the Director of Overseas Surveys London with a view to his organization producing a completely new series of maps on 1/10,000 and 1/25,000 scale from the new topography. Negotiations were still proceeding at the end of the year.
Electronic Computation
5.34. An experiment was carried out in the use of the I.C.T. 55 electronic computer at the Commerce and Industry Department for computation of survey material. The experiment showed that the computer would only be of limited assistance and could not be utilized for routine survey work. An experiment on a desk-type electronic calculating machine however proved very successful.
5.35. At the end of the year about 700 lots were awaiting survey for lease plans. In addition 153 requests to set out boundaries were on the waiting list.
Triangulation and Traversing
5.36. 202 new triangulation stations were established or re-fixed and 53 miles of precise traversing were run to establish 989 permanent Survey marks.
Levelling
5.37. 122 miles of precise levelling were run to establish 168 bench-marks. This included the checking of buildings at Mong Kok and Chai Wan affected by ground subsidence. 59 miles of ordinary levelling were run to provide spot heights.
Revision
5.38. 2,261 acres, or nearly 3 square miles, of Hong Kong Island and Kowloon were surveyed at 1/600 scale, bringing the total number of sheets available in this series to 394, an increase of 100 over last year's figure. Second revision survey continued in the Sai Ying Pun area of
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Air Photography for New Roads in the New Territories
5.32. Advantage was made of the presence of the aircraft to have low-level photographs taken of many possible new road alignments in the New Territories, so that in future, if and when surveys are required for these routes, strip-maps can be prepared quickly and economically for location purposes and for computation of earthworks.
New Series of Topographical Maps
5.33. Discussions were held with the Director of Overseas Surveys London with a view to his organization producing a completely new series of maps on 1/10,000 and 1/25,000 scale from the new topography. Negotiations were still proceeding at the end of the year.
Electronic Computation
5.34. An experiment was carried out in the use of the I.C.T. 55 electronic computer at the Commerce and Industry Department for computation of survey material. The experiment showed that the com- puter would only be of limited assistance and could not be utilized for routine survey work. An experiment on a desk-type electronic calculating machine however proved very successful.
5.35. At the end of the year about 700 lots were awaiting survey for lease plans. In addition 153 requests to set out boundaries were on the waiting list.
Triangulation and Traversing
5.36. 202 new triangulation stations were established or re-fixed and 53 miles of precise traversing were run to establish 989 permanent Survey marks.
Levelling
5.37. 122 miles of precise levelling were run to establish 168 bench- marks. This included the checking of buildings at Mong Kok and Chai Wan affected by ground subsidence. 59 miles of ordinary levelling were run to provide spot heights.
Revision
5.38. 2,261 acres, or nearly 3 square miles, of Hong Kong Island and Kowloon were surveyed at 1/600 scale, bringing the total number of sheets available in this series to 394, an increase of 100 ever last years. figure. Second revision survey continued in the Sai Ying Pun area of
57
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