1 and their use on construction sites. 2 - gps is only a tool
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and their Use on and their Use on
Construction SitesConstruction Sites
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- GPS is - GPS is onlyonly a tool. a tool.
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-GPS is GPS is onlyonly a tool. a tool.
- How do we lay stuff out?- How do we lay stuff out?
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- - 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.
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- 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..
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- 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.
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GPS GPS
- Where did it come from? Where did it come from?
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GPS GPS
- Where did it come Where did it come from?from?
- How does it work? How does it work?
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Ottawa
300 km
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Ottawa
300 kmToronto
200k
m
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Ottawa
300 kmToronto
200k
m
North Bay100 KM
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- - Pre trip Pre trip PlanningPlanning
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-Pre trip PlanningPre trip Planning
- Signal Power only 50 Watts!- Signal Power only 50 Watts!
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Sources of Error
• Tropospheric
• Ionospheric
• Multipathing
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Virtual Reference Stations
• Calculate coordinates at each receiving station
• Differential GPS, cel phone transmission of error
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Other Sources of Error
• Multipathing
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Other Sources of Error
• Multipathing
• Urban Canyons
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Other Sources of Error
• Multipathing
• Urban Canyons
• Accuracy versus precision
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Other Sources of Error
• Multipathing
• Urban Canyons
• Accuracy versus precision
• NAD 27, NAD 83 and CSRS
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Other Sources of Error
• Multipathing
• Urban Canyons
• Accuracy versus precision
• NAD 27, NAD 83 and CSRS
• Local Area Network Adjustments
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Questions????