1 and their use on construction sites. 2 - gps is only a tool
TRANSCRIPT
11
and their Use on and their Use on
Construction SitesConstruction Sites
22
- GPS is - GPS is onlyonly a tool. a tool.
33
-GPS is GPS is onlyonly a tool. a tool.
- How do we lay stuff out?- How do we lay stuff out?
44
- - GPS is GPS is onlyonly a tool. a tool.
- How do we lay stuff out?- How do we lay stuff out?
- 3D Modelling.- 3D Modelling.
55
- Departmental Directive on the release of Departmental Directive on the release of electronic drawings and the use of GPS electronic drawings and the use of GPS for Construction Layoutfor Construction Layout..
66
- Departmental Directive on the release of Departmental Directive on the release of electronic drawings and the use of GPS electronic drawings and the use of GPS for Construction Layout.for Construction Layout.
- Still required to set markers in the field. - Still required to set markers in the field.
77
GPS GPS
- Where did it come from? Where did it come from?
88
GPS GPS
- Where did it come Where did it come from?from?
- How does it work? How does it work?
99
Ottawa
300 km
1010
Ottawa
300 kmToronto
200k
m
1111
Ottawa
300 kmToronto
200k
m
North Bay100 KM
1212
- - Pre trip Pre trip PlanningPlanning
1313
-Pre trip PlanningPre trip Planning
- Signal Power only 50 Watts!- Signal Power only 50 Watts!
1414
Sources of Error
• Tropospheric
• Ionospheric
• Multipathing
1515
Virtual Reference Stations
• Calculate coordinates at each receiving station
• Differential GPS, cel phone transmission of error
1616
Other Sources of Error
• Multipathing
1717
Other Sources of Error
• Multipathing
• Urban Canyons
1818
Other Sources of Error
• Multipathing
• Urban Canyons
• Accuracy versus precision
1919
Other Sources of Error
• Multipathing
• Urban Canyons
• Accuracy versus precision
• NAD 27, NAD 83 and CSRS
2020
Other Sources of Error
• Multipathing
• Urban Canyons
• Accuracy versus precision
• NAD 27, NAD 83 and CSRS
• Local Area Network Adjustments
2121
Questions????