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Manual Notice
| TxDOT GPS User’s Manual |
TxDOT Manual System
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Manual Notice 2005-1
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1.
Introduction
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1.
Overview
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Summary
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Documentation of Authority
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Laws and Standards
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Purpose of the TxDOT GPS User’s Manual
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Scope
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Organization of Chapters
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2.
Chapter Descriptions
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About this Section
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Chapter 2, Background
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Chapter 3, Accuracy Standards
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Chapter 4, Equipment and Resources
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Chapter 5, Network Design
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Chapter 6, GPS Survey Specifications
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Chapter 7, Units, Data, and Metadata
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Chapter 8, Project Documentation and Deliverables to TxDOT
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Appendix A, References
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Appendix B, Glossary
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Hyperlinks
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How to Get Help
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Printing
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2.
Background
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1.
Overview
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Purpose
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2.
Surveying with GPS
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Survey Background Information
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Accuracy of a GPS Survey
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Error Sources in a GPS Survey
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Operational Procedures
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3.
Surveying Vertical Networks with GPS
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Overview
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Ellipsoid Measurements
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Height Component
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4.
Coordinate Systems
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Overview
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National Spatial Reference System (NSRS) and Continuously Operating Reference Stations (CORS)
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Cooperative CORS Stations
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FBN and CBN
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3.
Accuracy Standards
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1.
Overview
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Summary
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2.
GPS Survey Accuracy
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Overview
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Federal Geographic Data Committee Methodology
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3.
Local and Network Accuracy
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Standards
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Positional Tolerance and Associated Coordinates
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Federal Geodetic Data Committee (FGDC) Standards
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TxDOT Standards
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4.
Standards and Specifications
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Standards and Specifications Issues
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Accuracy Levels and Specifications
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Statistical Analyses
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Terminology
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4.
Equipment and Resources
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1.
Overview
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Summary
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2.
Instruments
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GPS Receiver
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GPS Antenna
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GPS-RTK Rover Rod
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Tripods
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Tribrachs
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Instrumentation Requirements
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Personnel
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3.
Internet Resources
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The CORS Site
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Retrieving Data from the CORS Site
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Obtaining Coordinates from the CORS Site
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OPUS
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NGS Description of OPUS
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NGS OPUS Requirements
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Useful Web Sites
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Retrieving Data from TxDOT
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5.
Network Design
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1.
Overview
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Summary
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2.
Design Features
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Control
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Orthometric Heigth
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Network Baseline
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Accuracy Standards for Network Baseline
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Example of a Network Design Procedure
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6.
GPS Survey Specification
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1.
Overview
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Scope
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2.
Specifications
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Overview
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3.
Planning
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Overview
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Reconnaissance
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Monumentation for New Stations
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Naming Convention for Level 1 and Level 2 Monuments
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Control Point Data Sheet Form
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GPS Control Point
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Satellite Health and Availability
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Sky Visibility
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Satellite Geometry
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Space Weather Considerations
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4.
Monumentation
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Overview
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Monumentation Guidelines
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5.
Survey Methods
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Static Positioning
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FastStatic (Rapid Static) Positioning
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Post-Processed Kinematic (PPK) Positioning
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Real-time Kinematic (RTK) Positioning
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6.
Field Survey Operations and Procedures
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Overview
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TxDOT Survey Levels
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Level 1 Surveys
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Level 2 Surveys
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Level 3 Surveys
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Level 4 Surveys
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Level 5 Surveys
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Level 6 Surveys
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Level 7 Surveys
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Field Quality Control
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Monument Identification
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Data Collection Forms
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Static Observation Field Procedures
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RTK Field Procedures
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Rover Settings
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Rover Initialization
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RTK for Wing Panels
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RTK for Topographical Surveys
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7.
Data Processing
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Overview
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Orbit Ephemeris
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Atmospheric Error Reduction
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Baseline Processing
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Troubleshooting Problematic Baselines
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Baseline Analysis
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Baseline Processing Reports
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Comparison of Redundant Baselines
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Loop Closure Reports
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Data Adjustment Analysis
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Minimally Constrained Adjustment
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Fully Constrained Adjustment
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Orthometric Height Determination
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7.
Units, Datum and Metadata
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1.
Overview
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Purpose
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2.
Units and Datum
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Units
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Datum
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Surface Coordinates vs. State Plane Grid Coordinates
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3.
Metadata
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Identifying Delivered Coordinates
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Conversions and Transformations
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8.
Project Documentation and Deliverables to TxDOT
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1.
Overview
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Purpose
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Scope
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2.
Project Documentation
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Printed Technical Reports
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Digital Data
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Control Point Data Sheets
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3.
Project Deliverables
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Validation Surveys
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A.
References
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B.
Glossary
TxDOT GPS User’s Manual
August 2005
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