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ET Cogo

Allows the user to build traverses adding straight or curved courses using numerous parameters

1206cogostart.jpg (13892 bytes) ET Cogo Dialog
  • Define TakeOff point by:
    • X & Y
    • Interactively
      • Start or End point of the selected feature
      • Closest vertex of the selected feature
      • Freehand
  • Set Start Point button locates and assigns takeoff point for a traverse
  • Traverse button opens traverse dialog
  • Quit - ends the COGO session
14082000Traverse.jpg (20115 bytes) ET Traverse Dialog

Current location Control Panel shows the coordinates of the last point of the traverse

Next course , Curve Direction and Course parameters Control panels allow the user to define the geometry of the next course.

The following combinations are possible:

  • Straight
    • Distance & Bearing
    • X & Y
    • dX & dY
    • use the GetBearing tool to get the bearing from a feature from the active theme
    • use +90 or -90 buttons to increase (decrease) the bearing with 90 degrees.
    • the two features above allow adding courses parallel or perpendicular to existing features from the active theme
  • Fillet - Distance,Bearing & Fillet radius
  • Tangent curve (left or right to the previous course)
    • Chord  length & Delta
    • Chord length & Radius
    • Chord length & Arc
    • Arc length & Radius
    • Arc length & Delta
    • Radius & Delta
  • Non tangent curve (left or right to the previous course)
    • Chord length, Chord Bearing & Radius
    • Chord length, Chord Bearing & Arc length
    • Chord length, Chord Bearing & Delta

Note: A traverse can not start with Fillet or Tangent curve

Add Course button adds a course with the predefined parameters to the traverse

Undo - removes the last course of the traverse (multiple undo supported)

Close Traverse - closes current traverse

END  button - if current theme is editable - adds the traverse as a feature in the theme otherwise creates a graphic shape in the view.

1206cogotraverse.jpg (22196 bytes)
1206cogoazimuth.jpg (9275 bytes) By default the bearing is entered as Decimal Degrees - (45.2375).

Hold the CONTROL key and click on the Bearing Text Line to introduce ET Azimuth dialog which allows the bearing to be entered as an Azimuth ((N 45 23 00 E). The direction is defined by the selected radio button.