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?
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.