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BASIC SURVEYING KNOWLEDGE FOR HIGH DEFINITION SCANNING
Steven Rames, PE/LSSeptember 12, 2013
BACKGROUND KNOWLEDGE TO HDS
Youtube Video
Equipment
• Levels (Dumpy, Auto, Digital)• Transit• Theodolite• EDM – Electronic Distance Measurement• Total Station• GPS – Global Positioning System• LiDAR – Light Detection and Ranging• HDS - High Definition Scanning• Photogrammetry.
Equipment - Levels
Equipment – Transit/Total Station
Equipment - Modern
Examples
Datum(s)
• Horizontal/Vertical–Assumed–Local–Building Based–Geodetic–ECEF–National
Datums - Examples
• Horizontal– Latitude, Longitude– NAD 27– NAD 83– 0,0– 1000.00,10,000.00– State Plane Coordinates– UTM– NTRS
• Vertical– Sea Level– NAVD29– NGVD88– GRAVD– Geoid– Ellipsoid– Ground/Floor– 100.00
Control
• System of horizontal and vertical positions with know accuracy
HDS Uses
• Forensics• Architecture• Engineering• Historical Preservation• Science/Exploration• Construction• Surveying• Utilities Management
• Static• Mobil• Airborn• Hydrographic• Ground Penetrating
Methods of HDS
Surevey Exercises
• Horizontal Measurement– Chaining
• Plumbing• Sag• Thermal
– Cloth Tape– Pacing
• Leveling– Notes
• Angles
Leveling
Questions
• Sag – 30 Lbs Pull offset the sag in a 100.00’ chain
• Thermal ChangeC=0.00000645(T-68)100