Power InRoads SS2

I am running Power InRoads SS2 and using working units in survey feet.  It has come to the attention of my client, that my horizontal alignments are not tracking correctly.  The problems grows over the course of the project.  Are there any know issues with this?  We are both set in the same working units/seed files.

Parents
  • Actually it is worse than that. 
    After some investigation, this is what I have discovered:
    Test:  Create a straight line horizontal alignment from a line 170000 survey feet in length.  Check stationing, length and coordinates.
    - I am working in the proper seed file with the proper units set in survey feet.
    -I am georeferenced.
    -Coordinates are correct.
    -When I create a horizontal alignment, the alignment is 169993.1831 long.
    Does anyone know what on earth I have got that is distorting my alignment?  Is it affecting anything else (surface, etc.). 
    Running Power InRoads (SS2) V08.1106.428.
     
  • Check your Project Defaults (File > Project Defaults). There is a Default Grid Factor. It is used to scale grid  coordinates to ground coordinates. This is an excerpt from the Help topic:

    Grid Factor

    Specifies the grid factor. Multiplying a ground measurement by the Grid Factor produces a grid measurement. The Grid Factor applies to horizontal distances, which include arc lengths, tangent distances, chord lengths, radii, stationing, offsets, and slopes/gradients. (Slopes are affected because they involve a horizontal component.) Other computations that involve the Grid Factor include spiral constants, areas, volumes, and rate of change/K values.

    If you find its not 1, try setting it to 1. You might want to see if some survey person has dictated that this value is correct, however.


    Charles (Chuck) Rheault
    CADD Manager

    MDOT State Highway Administration

    • MicroStation user since IGDS, InRoads user since TDP.
    • AutoCAD, Land Desktop and Civil 3D, off and on since 1996
Reply
  • Check your Project Defaults (File > Project Defaults). There is a Default Grid Factor. It is used to scale grid  coordinates to ground coordinates. This is an excerpt from the Help topic:

    Grid Factor

    Specifies the grid factor. Multiplying a ground measurement by the Grid Factor produces a grid measurement. The Grid Factor applies to horizontal distances, which include arc lengths, tangent distances, chord lengths, radii, stationing, offsets, and slopes/gradients. (Slopes are affected because they involve a horizontal component.) Other computations that involve the Grid Factor include spiral constants, areas, volumes, and rate of change/K values.

    If you find its not 1, try setting it to 1. You might want to see if some survey person has dictated that this value is correct, however.


    Charles (Chuck) Rheault
    CADD Manager

    MDOT State Highway Administration

    • MicroStation user since IGDS, InRoads user since TDP.
    • AutoCAD, Land Desktop and Civil 3D, off and on since 1996
Children
No Data