Vertical Datum Transformation

[DanielEccles]

Hi, I'm trying to convert ETRS89 (UK) both vertical and horizontal to OSGB36 (OSTN15/OSGM15) using meters ODN as the vertical datum.  ArcPro has the transformation parameters for the horizontal conversion but it doesn't seem to have the vertical transformation available.  Having search the web, I think the following is the latest transformation:

ETRS89 to Newlyn height (2)

Is there somewhere I can download this transformation and if so how do I add it to the ESRI set of verical transformations?  Or, am I going about this all wrong?

Thanks.

[DanPatterson]

Vertical Coordinate Systems in the ArcGIS Platform (esri.com)

maybe got to My Esri, My Organizations, Downloads.

But the only ones available there are

[BojanŠavrič]

Thank you, @DanielEccles, for your inquiry. 

Currently, ArcGIS Pro doesn't not include a vertical transformation using OSGM15 geoid model to covert heights to Newlyn (WKID::5701). It is on our list and we are working on it to make it available. 

Unfortunately, Pro also doesn't support custom vertical transformations, so you cannot just add a new one to the set. This is also something on our list, but some other projects came up and we haven't been able to get to it.