Tawn Nugent, George Butler Associates, Inc.

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BEGINNING HORIZONTAL VERTICAL ALIGNMENT DESIGN
Tawn Nugent, George Butler Associates, Inc.
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• HORIZONTAL GEOMETRY TOOLS
• Coordinate Geometry (COGO)
• Graphical COGO
• Horizontal Alignment Generator
• Store Graphics

Store points, lines, curves, spirals, chains,
parcels and profiles
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• VERTICAL GEOMETRY TOOLS
• Ground Profiles
• VPI Based Vertical Alignment Design Tools
• Component Based Vertical Alignment Design Tools

Store profiles
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COGO

• Stored within a binary database (job.gpk)
• Visualizes computations on screen (if desired)
• Records commands to file (if desired)
• Able to calculate new elements based on existing
  COGO elements

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GRAPHICAL COGO

• MicroStation look and feel
• Graphically stored and identified
• Double precision solutions
• Stored within same binary database (job.gpk)
• Visualizes commands on screen (if desired)
• Shows commands in COGO dialog
• Automatic element name generation, but user can
  modify

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HORIZONTAL ALIGNMENT GENERATOR

• COGO must be open to use tools
• MicroStation look and feel
• Stored within same binary database (job.gpk)
• Visualizes commands on screen (if desired)
• Shows commands in COGO dialog
• Automatic element name generation from
  preferences
• Extensive alignment design options

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STORE GRAPHICS

• Stores existing MicroStation elements into COGO
• Precision depends on design file resolution and
  settings
• User must identify all elements
• Always creates new COGO elements
• Use only when precision is not critical
  (utilities)

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EXAMPLE PROJECT

• Coordinates available from another consultant for
  baseline of connecting roadway
• Survey points provided for another connecting
  roadway
• Rough idea of where proposed roadway will be
  located

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COORDINATES

• State plane or ground coordinates
• Verify Combined Adjustment Factor (CAF)
• Use COGO tools to store points, curves and chains

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SURVEY POINTS

• First use Survey Manager to process survey
• Option 1 - Convert Survey Chains to Chains w/in
  Survey Manager
• Option 2 - Store Chain using Survey points w/in
  COGO

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PROPOSED ALIGNMENT

• Graphical COGO tools
• Horizontal Alignment Generator tools
• Calculating new alignment using two already
  stored chains

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GROUND PROFILES

• Determines existing ground elevation from TIN at
  user defined intervals along chain
• Stores profile in COGO
• Able to store offset profiles
• Option 1 - Pre-2001 tool Ground Profile
• Option 2 - 2001 tool Draw Profile
• Must have chain stored already to use either tool

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VPI BASED VERT. ALIGNMENT

• Must reference previously stored chain
• Able to distort horizontal/vertical scale
• Use Profile Cell!!!!!
• Place cell at beginning of chain even if profile
  starts within chain
• User can define Grade, design speed, K-value,
  elevation and station values
• Dynamically manipulate VPIs and curves

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COMPONENT BASED VERT. ALIGNMENT

• Requires Active Chain Control tool activated,
  COGO session open, and Profile Cell identified
• Able to place lines and curves and also
  manipulate previously placed elements
• Stores profile into COGO
• Can import profile from COGO also
• Profile Cell Control enables user to define size
  of cell unlike VPI Based tool or Design Comp.
  Manager

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EXAMPLE PROJECT

• Existing profiles can be stored using either tool
• VPI Based tool used to store profile from
  as-built plans
• Either tool used to store proposed alignment
• Use Design Computation Manager or Draw Profile
  tool to display stored profiles