The Directorate has no flying unit. Since the last report it has mapped from 
photography flown by commercial firms under contract, by the Royal Air Force, 
by the Royal Navy, by overseas governments and their contractors, and by the 
United States Navy. The photography has been taken by RC8, RC9, F49 and 
T-11 cameras. Helicopter-borne photography was used for the first time to 
produce a series of contoured maps at 1:10 000. Infra-red photography was used 
in photomapping swamp areas. 
Aerial triangulation by the independent model technique (65) is used for mapping 
at all scales: artificial point marking is by Wild PUG4 and observations use 
various Wild plotting machines with EK5, EK8 and EK22 co-ordinate registration 
devices. Plotting machines include a Wild A10, several Wild A8s and B8s, 
Thompson-Watts Plotters and numerous Kern PG2s. Rectification, where needed 
is by Wild E4. Slotted template methods are used to control the mosaics for 
photomap series, which are only produced for areas of low relief. 
’ 
FAIREY SURVEYS LIMITED 
During the period 1972-1975, vertical aerial survey photography was successfully 
flown for approximately 50 overseas projects, covering a total of over 750 000 
km? . The countries served included Botswana, Chad, The Gambia, Ghana, 
Zambia, Libya, Sudan, Yemen, Saudi Arabia, Dubai, Iraq, Nepal, Belize and 
Barbados. Wide angle and super-wide angle survey cameras were employed; 
contact scales ranged from 1:3000 to 1:80 000. Amongst the larger areas 
covered were 180 000 km^ of 1:80 000 super-wide angle photography for one of 
several projects in Saudi Arabia; 28 000 km“ at either 1:20 000 or 1:12 000 
contact scale in Nepal; 54 000 km^ at 1:40 000 contact scale in Botswana; 
12 600 km^ at both 1:10 000 and 1:40 000 scales in Libya. 
In the United Kingdom during the same period, aerial photography for some 245 
projects was completed. Contact scales ranged from 1:2000 to 1:24 000, taken 
mostly with wide angle survey cameras. Amongst the larger aerial photography 
projects were 1:5000 scale cover for the whole of the county of Tyne and Wear 
and 1:10 000 scale colour photography for most of the Scottish coastline. 
Photogrammetric mapping was carried out for approximately 330 separate 
projects, plotting at scales ranging from 1:50 to 1:50 000, although most of the 
work was in the range 1:500 to 1:10 000. The countries for which this mapping 
was produced included United Kingdom, Uganda, Zambia, The Gambia, Libya, 
Saudi Arabia, Kuwait, Dubai, Malaysia, Singapore and Hong Kong. One of the 
largest surveys was the mapping at 1:50 000 scale of a band 630 km long x 10 km 
wide for the route of a proposed road in Libya. Several large road projects in 
the UK have also been mapped at 1:500 and 1:1000 scales with provision of digital 
ground model data. Orthophotomapping for some 21 projects was completed at 
publication scales ranging from 1:1000 to 1:5000, usually with contouring 
superimposed (38, 41, 42, 46). Terrestrial photogrammetry was used for a 
survey of the east face of the Rock of Gibraltar in connection with surface 
stabilisation measures. A land use interpretation survey for all urban areas in 
England and Wales was started during the period under review and is expected 
to be completed in 1976. 
A subsidiary company, Fairey Surveys Scotland Ltd., has been formed during the 
period. It is based at offices in Livingston New Town, near Edinburgh, with 
photogrammetric and cartographic capacity. 
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