Our team on the ground uses GPS ASHTECH to correlate
precisely the control points which are indispensable in the
process of aerial triangulation.
Topographical surveys are spread over the whole of a territory,
in accordance with the needs expressed by the client (for
example : a feasibility study before the commencement of specific
work).
In effect, these surveys allow the geographical referencing
of aerial photos
in space by combining the measurement of the position of
the camera, the angle of its orientation and the ground
control points. These are subsequently converted to the
desired co-ordinates (ex : Lambert II). These reference
points, identified on the aerial photos, are the known co-ordinates
obtained by an operator on the ground equipped with GPS.
The precision of the information received is a determining
factor in the quality of our map-making.
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