En jämförelse mellan TLS och UAV-fotogrammetri : Inmätning av hårdgjorda ytor
At present day there are several different methods for measuring of paved surfaces.
The most common methods today are measuring with a total station, the Global
Navigation Satellite System (GNSS) and terrestrial laser scanning (TLS). Recently the
development of unmanned aerial vehicles, known as drones, has increased
exponentially and today there are several ways of using drones for measuring surfaces
by photographing and laser scanning.
This thesis contains a comparison between the methods terrestrial laser scanning
(TLS), and unmanned aerial vehicle photogrammetry (UAV). The measurements have
been applied on two different test surfaces, one of asphalt and one of gravel. The
purpose of the comparison is to investigate whether the airborne photogrammetry is
equivalent accurate in its height levels as the terrestrial laser scanning. For the
comparison to be more extensive, these two methods have not only been compared
in precision but also in the areas of ease of use and economy.
The precision was analyzed by comparing the height levels in randomly placed control
points on the test surfaces. This has been made possible by the creation of terrain
models of test surfaces in the software Geo where a surface scan of the models have
been implemented. With the help of surface control the height deviations in the
control points have been calculated and from these deviations the precision of the
airborne photogrammetry has been evaluated. The ease of use has been analyzed
based on observations made and information gathered from experienced consultants
for each technology. For the economic aspect the costs for each measurement
method has been presented to get an overall picture of each measurement method
The work has been carried out on behalf of the consulting firm Bjerking AB. The goal
is to be able to provide Bjerking with a recommendation for which technology is best
suited for measuring of paved surfaces.
The results of the survey show that the UAV varies by a mean of 11 mm on the
surface of gravel and 2 mm on the surface of the asphalt. The final recommendation
given is that the UAV is preferred for measurement of asphalt roads, because since
the precision is equivalent to TLS, the method is safe
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