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Question

Are .GDC files for vertical transformations reversible?

  • November 28, 2018
  • 1 reply
  • 16 views
M

I have converted data from NAD83 (CSRS) 1997 to NAD83 (CSRS) 2010, along with this conversion, vertical handling is converting the z values to CGVD2013.

I am now trying to reverse the transformation. I am able to successfully reverse the horizontal values using the (Reversed) transformation option. I am wondering if there is a reversed option for vertical .gdc files? or is a new file altogether required?

I am having no luck finding information online for this.

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    1 reply

    daveatsafe
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    • daveatsafeSafer
    • Safer
    • 1637 replies
    • November 29, 2018

    Hi @michoo,

    The Vertical Handling option 'Orthometric height -> Geocentric or ellipsoidal height' is the reverse of 'Geocentric or ellipsoidal height -> Orthometric height'. You should choose the same grid file for each.

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