1 and their use on construction sites. 2 - gps is only a tool

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1 1 and their Use on and their Use on Construction Sites Construction Sites

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Page 1: 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

Page 2: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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- GPS is - GPS is onlyonly a tool. a tool.

Page 3: 1 and their Use on Construction Sites. 2 - GPS is only 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?

Page 4: 1 and their Use on Construction Sites. 2 - GPS is only 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?

- 3D Modelling.- 3D Modelling.

Page 5: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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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..

Page 6: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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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.

Page 7: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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GPS GPS

- Where did it come from? Where did it come from?

Page 8: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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GPS GPS

- Where did it come Where did it come from?from?

- How does it work? How does it work?

Page 9: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Ottawa

300 km

Page 10: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Ottawa

300 kmToronto

200k

m

Page 11: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Ottawa

300 kmToronto

200k

m

North Bay100 KM

Page 12: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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- - Pre trip Pre trip PlanningPlanning

Page 13: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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-Pre trip PlanningPre trip Planning

- Signal Power only 50 Watts!- Signal Power only 50 Watts!

Page 14: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Sources of Error

• Tropospheric

• Ionospheric

• Multipathing

Page 15: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Virtual Reference Stations

• Calculate coordinates at each receiving station

• Differential GPS, cel phone transmission of error

Page 16: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Other Sources of Error

• Multipathing

Page 17: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Other Sources of Error

• Multipathing

• Urban Canyons

Page 18: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Other Sources of Error

• Multipathing

• Urban Canyons

• Accuracy versus precision

Page 19: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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Other Sources of Error

• Multipathing

• Urban Canyons

• Accuracy versus precision

• NAD 27, NAD 83 and CSRS

Page 20: 1 and their Use on Construction Sites. 2 - GPS is only a tool

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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????