GNSS Monitoring
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Transcript of GNSS Monitoring
The Department of Water Affairs in South Africa expands Dam Monitoring to GPS/GNSS Deformation Monitoring
Trimble - NetR5 receiver - Zephyr Geodetic Antenna
DELL T310 Server Poynting WIFIRB411 panel Antenna
Sector 90 deg Antenna
Omni 360 deg Antenna VSAT Antenna SkyEdge Modem
GNSS BASIC EQUIPMENT
BASIC GNSS SETUP CREST OF DAM WALL
TYPICAL GNSS REFERENCE STATION
Zephyr Geodetic Antenna3rd Arch Stompdrift dam
Omni 360 deg AntennaRoode Els Berg dam
GNSS Monitoring LayoutDuivenhoks Dam
GNSS Monitoring LayoutStompdrift Dam
GNSS Monitoring LayoutKouga Dam
GNSS Monitoring LayoutRoode Els Berg Dam
Some Key features of Trimble 4D ControlPost Processing Monitoring
• Computation and analysis of sensor displacement
• Axis Rotation – computation and display of displacements along a user defined
• Displacement charts and tables
• User defined tolerance settings Instant notification of deformations that exceed he pre-set tolerance values.
• Alarm Manager – Real time warnings and alerts via email Real time warnings and alerts via email
• Remote login to view and control the system
Kouga dam - Left Flank Crest1 Hour Post Processing Graph
Kouga dam - Right Flank Crest6 Hour Post Processing Graph
GNSS Reference station coordinates derived from Geodetic Deformation results
Roode Els Berg Dam
Station Date Y X dy dx (m) (m) (m) (m)
P01 22/02/2012 205.2479 400.8471 P01 17/02/2013 205.2495 400.8486 +0.0016
+0.0015 Mean 205.2487 400.8478
P03 22/02/2012 -86.0861 252.9499 P03 17/02/2013 -86.0854 252.9516 +0.0007
+0.0017 Mean -86.0858 252.9508
Computed local GNSS co-ordinates of secondary GNSS pillars on crest of dam
Roode Els Berg Dam
Station Date Y X (m) (m)
P203 22/02/2012 GNSS -38.9167 27.0547 22/02/2012 Geodetic -38.9169 27.0540 Diff -0.0002 -0.0007
P203 18/02/2013 GNSS -38.9176 27.0532 19/02/2013 Geodetic -38.9172 27.0545 Diff +0.0004 +0.0013
P206 22/02/2012 GNSS 36.0821 26.9494 22/02/2013 Geodetic 36.0819 26.9488 Diff -0.0002 -0.0006
P206 18/02/2013 GNSS 36.0811 26.9492 19/02/2013 Geodetic 36.0815 26.9499 Diff +0.0004 +0.0007
GNSS vs GEODETIC Deformations at Roode Els Berg dam
Temperature and Water Level
Up/Downstream GNSS Deformations
GNSS vs GEODETIC Deformations at Roode Els Berg dam
Temperature and Water Level
Left/Right Flank GNSS Deformations