[http://www.bayo.com/]
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At the designing stage Depending of course on the type of line or pipe in project, many different aspects have to be taken into account when searching for the best alignment. Usually, the following elements have to be analyzed: - The horizontal alignment - The vertical alignment (and in some cases the cross sections) - The accesses The search for corridors can be optimized by using existing maps in developed countries or satellite imagery combined with a worldwide DTM in the rest of the world. Profile surveys are used at a later stage of the process. They can be obtained using GPS or extracted from a DTM by stereo plotting aerial photographs or from high-resolution satellite images rectified with GPS. At the working stage The actual staking out of the axis, masts, manholes or other elements can be accomplished more quickly than with conventional methods.
Surveying and staking out overhead lines, pipelines and drain systems using GPS
Staking out pylons near Saint Etienne
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TopoSat - Topography by Satellite
[http://www.toposat.fr/pages/metier_lignespag.html]
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