The experimental project of measuring the earthwork quantities from air photographs taken by this office was completed but results were disappointing. Although the air photographs were excellent there were discrepancies in the final figures which indicated that the method and/or the computer programming needed more investigation before this system can be used successfully.
6.23. Production of the new topographical maps at 1:10,000 scale by the Directorate of Overseas Surveys continued at a steady rate. During the year 12 plotted sheets were received for field-completion and 17 completed and returned for fair-drawing. The sheets covering the built-up areas of Kowloon and Hong Kong are now being received; because these are plotted from air photography taken in December 1964, each sheet requires a large amount of additional surveying, plotting etc. to bring up-to-date. Negative proofs of five sheets covering the frontier area were received for comments and returned to the Directorate with minor amendments for final printing. 23 sheets were published during the year bringing the total number available at the end of the year to 26. Bulk supplies of most of these were received and distributed to Government departments.
6.24. A final printed proof of the first 1:25,000 scale sheet was received for comments and approved. Printing of the first few sheets at this scale is now in hand.
6.25. The Director of Overseas Surveys visited the Colony in November 1968 for discussions on the mapping programme. The Assistant Director of Military Survey, Far East Land Forces, Singapore, arranged to be present in Hong Kong at the same time and, at a joint meeting, agreement was reached on future co-operation between the Directorate of Overseas Surveys in United Kingdom, the Survey Branch of Far East Land Forces in Singapore and this Office for the production of military editions of the new topographic maps. Approval was obtained to proceed with arrangements to publish the revised editions of the new maps locally and for production in Hong Kong of Chinese-language editions in due course.
6.26. The field work in connection with the Geological Survey of the Colony was completed in March 1969 and the Geologist seconded from the Institute of Geological Sciences returned to United Kingdom. The special geological maps were all completed before his departure and it is hoped that his interim report will be available in July or August 1969.
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The experimental project of measuring the earthwork quantities from air photographs taken by this office was completed but results were disappointing. Although the air photographs were excellent there were discrepancies in the final figures which indicated that the method and/or the computer programming needed more investigation before this system can be used successfully.
6.23. Production of the new topographical maps at 1:10,000 scale by the Directorate of Overseas Surveys continued at a steady rate. During the year 12 plotted sheets were received for field-completion and 17 completed and returned for fair-drawing. The sheets covering the built-up areas of Kowloon and Hong Kong are now being received; because these are plotted from air photography taken in December 1964, each sheet requires a large amount of additional surveying, plotting etc. to bring up-to-date. Negative proofs of five sheets covering the frontier area were received for comments and returned to the Directorate with minor amendments for final printing. 23 sheets were published during the year bringing the total number available at the end of the year to 26. Bulk supplies of most of these were received and distributed to Government departments.
6.24. A final printed proof of the first 1:25,000 scale sheet was received for comments and approved. Printing of the first few sheets at this scale is now in hand.
6.25. The Director of Overseas Surveys visited the Colony in November 1968 for discussions on the mapping programme. The Assistant Director of Military Survey, Far East Land Forces, Singapore, arranged to be present in Hong Kong at the same time and, at a joint meeting, agreement was reached on future co-operation between the Directorate of Overseas Surveys in United Kingdom, the Survey Branch of Far East Land Forces in Singapore and this Office for the production of military editions of the new topographic maps. Approval was obtained to proceed with arrangements to publish the revised editions of the new maps locally and for production in Hong Kong of Chinese- language editions in due course.
6.26. The field work in connection with the Geological Survey of the Colony was completed in March 1969 and the Geologist seconded from the Institute of Geological Sciences returned to United Kingdom. The special geological maps were all completed before his departure and it is hoped that his interim report will be available in July or August 1969.
76
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