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State Grid Factor program

Discussion in 'General Land Surveying' started by djames, Oct 22, 2013.

  1. djames

    djames 4-Year Member

    Joined:
    Jul 2, 2010
    Messages:
    851
    Location:
    North Carolina
    Anyone know of a stand alone program that will compute state combine grid factor using Geoid 12A ? for a given point or site average .
     
  2. John Putnam

    John Putnam 4-Year Member

    Joined:
    Feb 4, 2011
    Messages:
    464
    Location:
    Forest Grove, OR
    I would say CORPSCON but I'm not sure that it uses Geoid12A yet. I don't think this is a real problem though. The geoid model is used in the computation of the sea-level correction and I don't think a couple of cm difference in the model is going to add any significant error. We are talking about changes in the 9th decimal place which translates to a change of about .1 millimeter, definitely not a problem if you are using a combined factor.
     
  3. Mark Mayer

    Mark Mayer 4-Year Member

    Joined:
    Jul 21, 2010
    Messages:
    3,401
    Location:
    Portland, OR
    > I would say CORPSCON but I'm not sure that it uses Geoid12A yet.
    These instructions for loading Geoid09 can be easily adapted to load Geoid12a.
     
  4. djames

    djames 4-Year Member

    Joined:
    Jul 2, 2010
    Messages:
    851
    Location:
    North Carolina
    Current download says combine scale is wrong dont use.
     

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