GPS Survey Equipment GPS Trimble R6 or R8 Legs+Bipod Controller* Base Station or VRS Competencies...
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Transcript of GPS Survey Equipment GPS Trimble R6 or R8 Legs+Bipod Controller* Base Station or VRS Competencies...
GPS Survey Equipment
• GPS Trimble R6 or R8• Legs+Bipod• Controller*• Base Station or VRS
Competencies #1-5
GPS Survey Equipment
GPS Equipment Basics•In every office?•Requires only 1 person•Controller Setup
• Datums
•Anyone can get GPS buttons to work, we want QUALITY DATA!
Competencies #1-5
GPS Survey Equipment
GPS Survey Equipment
Competencies #1
•How GPS works with satellites
Position Dilution of Precision (PDOP)
Sources of Error
GPS Survey Equipment
•Satellites send timestamp signals to Earth•3 satellites required for horizontal•4 satellites required for vertical•5th is required for survey grade
Competencies #1
GPS Survey Equipment
Competencies #1
•Why need phone?
GPS Survey Equipment
Competencies #1
•Rover plus base station•Why need phone
GPS Survey Equipment
•Horizontal-Total Station accuracy about the
same
•Vertical- Total Station generally more
accurate
Accuracy if not fixed•Does not work properly without “sky”
• PDOP, Satellites
Competencies #1
Competencies #1
GPS Survey Equipment
GPS Equipment Special Issues•Site Calibration
• Once per Job• Minimum # control points
•2 big settings• Observed Control Point• Fast shot- Topo
•Can’t get close to building (15degree rule)
Competencies #2
Competencies #2