FIG Young Surveyors 2013, Lisbon, 18 October 2013 Low-Cost Integrated GNSS/INS for Surface Variation...
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- Slide 1
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Low-Cost
Integrated GNSS/INS for Surface Variation Monitoring Miguel
Cordeiro Joo Apolinrio
- Slide 2
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 High rates of
coastal line retreat. Coastal Erosion Monitoring (1/3) 2
- Slide 3
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Effective
human occupation in stretches of coastline with great vulnerability
to erosive phenomena. Coastal Erosion Monitoring (2/3) 3
- Slide 4
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Such
phenomena originates potential risk situations; That is why it is
extremely important to accurately monitor beach volumetric
variations and assess coastal erosion. Coastal Erosion Monitoring
(3/3) 4
- Slide 5
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Classical
Methods to Address the Problem 5
- Slide 6
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Very
Expensive; Governmental requirements, such as licenses,
environmental and safety issues. Terrestrial and Airborne LiDAR
6
- Slide 7
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Total
Stations Highly Time-Consuming 7
- Slide 8
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Mobile
Mapping Systems (MMS) The use of laser scanners makes it expensive;
Same Government requirements as LiDAR. 8
- Slide 9
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Developed
Low-Cost Solution 9
- Slide 10
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Trolley +
GNSS + Tablet 10
- Slide 11
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Methodology
11
- Slide 12
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Acquisition
Device Integrated system developed to collect GNSS data and
attitude angles simultaneously; Simple storage and portability.
12
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- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Antenna
Corrections Difficult to guarantee the verticality of antenna mast;
Correct acquired data using antenna attitude. 13
- Slide 14
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Air2Ground
Application developed and implemented in C# to correct the
coordinates of the acquired data. Inputs Initial Time offset;
Height of the mast; Mast distance to the ground; Antenna
coordinates in the IPad reference frame; Two text files (from the
GNSS data processing software and from the Tablet). Outputs Point
ID; Time of observation; Pitch, Roll, Yaw; X,Y,Z corrected
coordinates. 14
- Slide 15
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Surface
Computation With the corrected positions, we will be able to
generate a three-dimensional surface estimated using interpolation
techniques 15
- Slide 16
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Surface
Computation Finally, repeating the process at different times it
will be possible to study the coastal line evolution in a time
frame. 16 Repeat!!
- Slide 17
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Progress
Report Conducting experiments in an irregular terrain; Testing C#
application to guarantee that the corrections are right; In process
to generate a 3D surface of the tested area. 17
- Slide 18
- FIG Young Surveyors 2013, Lisbon, 18 October 2013 Thank you for
your attention! 18