control point

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Note added at 5 mins (2005-04-23 14:12:52 GMT)
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Definition points of detail selected as being easily recognisable on the overlap of three successive aerial photographs of a flight strip and on that of adjoining strips; used in the building up of a radial line plot

Reference Ford-Robertson,Soc.Am.Foresters
(1)
TERM minor control points

Reference Ford-Robertson,Soc.Am.Foresters

Note {GRM} n.p.pl.
{NTE} there are 6 per photograph;aerial survey
(2)
TERM pass points

Reference Ford-Robertson,Soc.Am.Foresters

Note {GRM} n.p.pl.
{NTE} there are 6 per photograph;aerial survey
(3)
TERM wing points

Reference Ford-Robertson,Soc.Am.Foresters

Note {GRM} n.p.pl.
{NTE} there are 6 per photograph;aerial survey