topic Vertical Datum Transformation? in Coordinate Reference Systems Questions https://community.esri.com/t5/coordinate-reference-systems-questions/vertical-datum-transformation/m-p/729981#M54 <HTML><HEAD></HEAD><BODY><P>I have dataset that my company receives from a vendor every month. We have a script that takes the dataset and clips it to an AOI and transforms the horizontal from NAD27 to WGS84 Web Mercator Auxillary Sphere. There is one feature that has Z values. So my question is do we have to apply a specific transformation to the vertical when we do a horizontal transformation?&nbsp;projection transformation#&nbsp;vertical transformations&nbsp;<A href="https://community.esri.com/t5/tag/geodetics/tg-p">#geodetics</A></P></BODY></HTML> Mon, 25 Jun 2018 12:39:05 GMT DavidNugent1 2018-06-25T12:39:05Z Vertical Datum Transformation? https://community.esri.com/t5/coordinate-reference-systems-questions/vertical-datum-transformation/m-p/729981#M54 <HTML><HEAD></HEAD><BODY><P>I have dataset that my company receives from a vendor every month. We have a script that takes the dataset and clips it to an AOI and transforms the horizontal from NAD27 to WGS84 Web Mercator Auxillary Sphere. There is one feature that has Z values. So my question is do we have to apply a specific transformation to the vertical when we do a horizontal transformation?&nbsp;projection transformation#&nbsp;vertical transformations&nbsp;<A href="https://community.esri.com/t5/tag/geodetics/tg-p">#geodetics</A></P></BODY></HTML> Mon, 25 Jun 2018 12:39:05 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/vertical-datum-transformation/m-p/729981#M54 DavidNugent1 2018-06-25T12:39:05Z