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Surveying is carried out by Datum Surveys Ltd using the latest Leica Viva total station and GNNS equipment. A minimum of 15 points per image are obtained in as wide and as deep a pattern as possible with particular attention being paid to obtaining points near the edges and corners of the frame as this provides the widest convergent angles to ensure the best possible alignment accuracy. Where there are insufficient fixed points then temporary targets are placed in the scene and the photography and surveying are carried out together.
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