Topographical
4.27. Contour surveys were made covering 4,862 acres for town planning and development schemes and were plotted to a scale of 1/600 at a vertical interval of 10 feet.
Revenue Survey
4.28. Demands for Revenue Survey which deals with boundaries of lots for lease, surrender, reconstruction, regrant of lease, etc. continued to increase.
4.29. 1606 new lots were set out, compared with 1327 last year and 1068 the previous year, 28 miles of buildings lines for 969 lots were checked, compared with 18 miles for 589 lots last year.
4.30. Details of 614 lots were sent to the Registrar General for the issue of Crown Leases. 391 surrender plans were made and 959 boundary stones were fixed for 221 lots. 37 lots had their boundaries re-established.
4.31. At the end of the year 399 surveys for leases, 61 surveys for surrenders and 104 requests to set out boundaries were on the waiting list.
New Territories Survey
4.32. The function of this group changed with the introduction of the Air Survey and its activity was confined to the area along the Colony border not covered by the Air Survey.
4.33. During the year a total of 12 miles of control traverse was laid down establishing 65 permanent co-ordinated points. Detail survey at a scale of 1/1,200 amounting to 6 square miles was completed.
4.34. 53 survey sheets were traced and forwarded to the District Commissioner, New Territories for identification of lot boundaries and areas of all lots and parcels of land were computed for 5 sheets. There are now 422 sheets available in this 1/1,200 series, compared with 369 sheets last year.
Air Survey
4.35. 1274 control points were converted to the new co-ordinate system and 472 air-photo control points fixed.
4.36. 45 machine plots were received from the contractor for field checking and 30 checked and returned.
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