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How to shift between two orthometric heights ?

J
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I everyone,

 

I need to vertically shift data between two canadian orthometric heights (HT2.0 to CGVD2013). I have this conversion grid in .byn format (I get it from NaturalRessources Canada website) and create de .gdc file to use it in the CsmapReprojector transformer.

 

However the CsmapReprojector transformer offers only orthmetric to ellipsoid or ellipsoid to orthometric handling, but the shift should be between to orthometric heights. So when I try both I get my data shifted up or down regarding to the vertical handling choice. But I have no idea wich one is the right shift !

 

Is there's a way to just apply (or transform) a .byn file for vertical shift ?

 

Thanks !

 

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Best answer by havmoejbv 10 March 2021, 11:35

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havmoejbv
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I would think you can transform from orthometric1 -> ellipsoidic and then ellipsoidic -> orthometric 2 ?

 

This is the normal way to handle these transformations here. You need data for both vertical datums to handle this anyway.

J
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Yes you're right it seems to work fine this way.

 

Thanks a lot !

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