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Highway Levelling &
Helicopter
Surveys
Photarc Surveys has developed a
photogrammetric method for the provision and analysis of
precise 3D data on motorways and trunk
roads. |
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Whilst aerial photography for mapping
purposes is usually taken with a large format aerial survey camera
in a fixed wing aircraft, Photarc Surveys also successfully uses a
smaller format (18 x 13cm) Zeiss UMK survey camera mounted on a twin
Squirrel or Bell Jet Ranger helicopter. This can be used in
situations where the use of a fixed wing aircraft would be
uneconomic or where larger scale photography is required. In
particular, we have devised a system of highway levelling based on
low level photography.
The technique provides road level information
remotely avoiding the costs, dangers, and resultant inconvenience
associated with the traffic management necessary with ground
survey.
3D modelling derived from highway
helicopter surveys.
Advantages:
The advantages of using a photographic system are many
and cannot be over emphasised. Whilst the ability to produce
further information from the photography without revisiting
the site are well known, other major advantages of the system
are: |
- Accuracy comparable to ground
surveys
- Non-intrusive measuring
technique
- Record photography
produced
- Limited traffic
management
- Cost effective.
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- Minimal site time
- Production of large scale
plans
- Wide Coverage
- High safety factor
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Results:
The resultant 3D surface can be provided in the
form of: |
- Tabulated data
- Plotted profiles and sections at
any scale
- Data files for most CAD
systems
- Triangulated surface or DTM for
further analysis
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| For a downloadable .pdf report on a low level
helicopter survey project for the Channel Tunnel Rail Link,
please visit our downloads
page. |
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