GPS MAPPING OF UTILITIES THE CITY OF ROWLETT RETROSPECT

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GPS MAPPING OF UTILITIESTHE CITY OF ROWLETT-
RETROSPECT
Cody Cantrell - Western Data Systems
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ACKNOWLEDGEMENT
Krishna Veeragandham Lance Singleton - City of
Rowlett
Dr. Carlos Aiken - University of Texas at Dallas
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PROJECT GOALS

• Position City Owned Utilities For GIS Data Base
• Use Trimble Pro XRS For GPS Positioning
• Use Laser Atlanta For Laser Offsets
• Maintain Sub-meter Accuracy Horizontal
• Correctly Identify All Features

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PROJECT REQUIREMENTS

• Unique ID Number for each Feature
• Minimum 15 Positions for each Feature
• MAX. PDOP of 6.00
• System U.S. State Plane 1983
• Zone Texas North Central 4202
• Datum NAD 1983 (conus)
• Units US Survey Feet

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PROJECT SETUP

• Data Dictionary
• Set Features
• Define Selected Objects To Be Collected
• (Fire Hydrants, Manhole Covers, Water Valves,
  Street Signs, Traffic Signs, etc.)
• Set Attributes
• Define Information About Each Feature
• (Color, Manufacturer, Year, Size, etc.)

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USING GPS - MOBILE
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NEED FOR LASER OFFSETS
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LASER GUN ERROR
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OTHER NEEDS FOR LASER OFFSETS
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USING LASER OFFSET
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USING LASER OFFSET

• Internal Laser Compass Not Used
• Magnetic Interference from Vehicle
• Heading from GPS used for Reference Bearing
• Laser Gun Operated at Right Angle from Heading

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TODAY

• Currently
• Pro Series capable of 10 cm Real-Time
• Handhelds capable of 10 cm Post-Processed
• Multiple Gigs of Memory and Storage
• Palm sized Laser Range Finders
• Costs less

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QUESTIONS?