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LSS has been used for beach and coastal surveys since the very early days of the software. At that time 'two-man' teams would use EDM survey equipment to measure a beach. More recently however, with the threat of coastal erosion due to rising sea levels and the increased risk from damaging storms many organisations are now required to monitor stretches of coastline and beaches much more frequently.
One solution to providing quick and accurate beach surveys has been the use of a GPS antenna mounted on a 4 wheel drive All Terrain Vehicle (ATV). This setup allows hundreds if not thousands of surveyed points to be collected in a day.
In spite of the obvious advantages of this method, there is one major disadvantage. When the ATV is driving along a sloping beach the pole of the antenna is not vertical which means that the surveyed points are not where they should be. The diagram below illustrates the problem.
While, for gently sloping beaches the error will be minimal, when traversing beach berms and storm ridges the errors can be quite large. The table below gives you some idea of the likely errors.
The above table assumes a 1.4m pole height, 1.2m wheelbase length and 1.0m wheelbase width.
What we have done in LSS is provided a solution to this problem and it is called 'GPS Pole Verticality Correction'. This command will make the necessary adjustments to every point which was surveyed from the ATV and generate a corrected terrain model. This command is available in LSS Solo, although the minimum that would be required in order to calculate volumes (often a requirement of beach surveys) would be LSS Vista.
We have put together a full explanation of the problem and the solution in a PDF document. Please select the button below to view this explanation and if you have any further questions then please contact us.