MicroStation GeoGraphics

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MicroStation GeoGraphics
Mohammad A. Masud
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MicroStation GeoGraphics

• Create, store and analyze spatially referenced
  data
• Built on MicroStation, which can be seen in the
  interface as well as in functionality
• Data in GeoGraphics is stored in projects.
• Project includes
• Database with attribute data, commands, feature
  definitions etc.
• DGN files with graphic elements like points,
  lines and shapes.

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PROJECT STRUCTURE
Attributes Commands
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Feature Components

• Necessary Components
• Graphics
• Feature Definitions
• Element Type
• Symbology
• Level
• Feature Code etc.
• Optional Components
• Attributes (Non Graphic)
• Commands
• Key-ins
• Macros etc.

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Topology

• Topology refers to the study of spatial
  relationships among map features.
• Three basic topology layers
• Nodes
• Lines and
• Area
• Topology Cleanup is the process of ensuring the
  map features to be topologically valid.
• Basic clean-up operations
• Removing Duplicates, Similars Fragments
• Removing Redundant Vertices,
• Segmenting Elements,
• Removing Gaps,
• Resolving Overshoots

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Thematic vs. General Purpose

• Thematic maps or special-purpose maps
• represent the spatial distribution of data to
  portray a particular theme.
• Climate, population distribution, vegetation and
  traffic flow.
• General-purpose or Reference maps
• represent natural and man-made features from the
  geographical environment.
• Examples include topographic maps and atlas maps.

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Thematic Resymbolization Options

• Based on attribute values
• Specify Table and Column
• Classification
• Automatic
• Unique, Equal Count or Equal Range
• Add/ Delete Classes
• Manual editing of class limit, label, level etc
• Automatic generation of legends

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Annotation

• Text labels for point, line and area features
  based on values in their associated database
  records
• Column values to be placed with an SQL statement
• Position, size, orientation of text labels can be
  specified.
• Annotations are automatically linked to their
  source database records.

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Spatial Analysis

• Layer Creation
• from displayed features,
• from zone generation, and
• from SQL statements.
• Layer Overlay
• Area to Area, Point to Area etc.
• Outputting
• Update Database tables, save txt, dat files etc.

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Linear Networking

• Edges and nodes are the two basic components,
• Cost Analysis based on distance, travel time and
  direction,
• Radial Search, Shortest Path, Forward and Reverse
  trace functionalities,
• Further Filtration is possible by SQL statements.

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Reprojection of Data

• Coordinate System Toolbar
• Coordinate Transformation
• On-the-fly Reprojection
• Grids and Graticules generation
• Geodesic Circles
• Design Plane Readout

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A Typical GeoGraphics Workflow
DWG Data
GIS Data
Reprojection
Warping
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TRAFFIC STUDY PROJECT

• Each Intersection will be resymbolized with
  appropriate symbols
• Any intersection that currently does not have a
  signal light, should be considered for promotion
  to signal light and flagged, if - for a
  4-segment intersection Total index gt 24, or
• - for a 3-segment intersection Total index
  gt 20

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TRAFFIC STUDY PROJECT

• Each segment will be
• symbolized according to its Traffic Index value
• labeled with its Segment ID and Travel Length in
  seconds based on V45 kmph
• short segments (less than 25 meter) should not be
  labeled

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TRAFFIC STUDY PROJECT

• A network analysis of all but the very slow
  traffic segments (Traffic Index lt 2) should be
  spatially done based on the following
  parameters
• Segment length
• Travel Length in seconds (both directions)
• Estimated Traffic delays in each intersection

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TRAFFIC STUDY PROJECT

• A network trace based on segment length showing
• The shortest path between two extreme flagged
  intersections that are considered for promotion
• A 500 meter radial search from an intersection in
  between the shortest path

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TRAFFIC STUDY PROJECT

• Final map should include all legends, a title,
  and important reference features.
• Finally a pdf conversion should be made that can
  display all the levels and reference files
  separately.

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Bentley Training Classes

• Applying GeoGraphics (3 day)
• Utilizing PowerMap (1 Day)
• Topology in GeoGraphics (1 Day)
• Projection Systems Management (1 Day)
• Administering GeoGraphics (1/2 Day)

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Question??
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• THANK YOU