topic WGS84 geoidal separation file in ArcGIS Pro Questions https://community.esri.com/t5/arcgis-pro-questions/wgs84-geoidal-separation-file/m-p/1360230#M76298 <P>I am using the&nbsp;<A href="https://pro.arcgis.com/en/pro-app/latest/help/data/imagery/converting-from-orthometric-to-ellipsoidal-heights-pro.htm" target="_self">Converting from orthometric to ellipsoidal heights workflow&nbsp;</A>in ArcGIS Pro 3.2 to convert a DEM provided relative to the WGS84 ellipsoid into geoidal heights. Therefore I am using the equation as follows:</P><P><SPAN>H = h - N</SPAN></P><P><SPAN>, where</SPAN></P><UL><LI>h = ellipsoidal height (current DEM)</LI><LI>H = orthometric (geoid) height (target DEM)</LI><LI>N = geoidal separation</LI></UL><P>The workflow specifies to use the file&nbsp;<SPAN>\Pro\Resources\pedata\geoid\WGS84.img as N.</SPAN></P><P><SPAN>My question is: what geoid model is used in this file? I read a&nbsp;<A href="https://community.esri.com/t5/imagery-and-remote-sensing-questions/query-regarding-wgs84-img-file/td-p/732942" target="_self">post</A> from 2017 that mentionned EGM96. Has it been updated to EGM2008 in newer ArcGIS Pro versions?</SPAN></P><P><SPAN>Thank you!</SPAN></P> Wed, 13 Dec 2023 13:18:09 GMT RoxFra 2023-12-13T13:18:09Z WGS84 geoidal separation file https://community.esri.com/t5/arcgis-pro-questions/wgs84-geoidal-separation-file/m-p/1360230#M76298 <P>I am using the&nbsp;<A href="https://pro.arcgis.com/en/pro-app/latest/help/data/imagery/converting-from-orthometric-to-ellipsoidal-heights-pro.htm" target="_self">Converting from orthometric to ellipsoidal heights workflow&nbsp;</A>in ArcGIS Pro 3.2 to convert a DEM provided relative to the WGS84 ellipsoid into geoidal heights. Therefore I am using the equation as follows:</P><P><SPAN>H = h - N</SPAN></P><P><SPAN>, where</SPAN></P><UL><LI>h = ellipsoidal height (current DEM)</LI><LI>H = orthometric (geoid) height (target DEM)</LI><LI>N = geoidal separation</LI></UL><P>The workflow specifies to use the file&nbsp;<SPAN>\Pro\Resources\pedata\geoid\WGS84.img as N.</SPAN></P><P><SPAN>My question is: what geoid model is used in this file? I read a&nbsp;<A href="https://community.esri.com/t5/imagery-and-remote-sensing-questions/query-regarding-wgs84-img-file/td-p/732942" target="_self">post</A> from 2017 that mentionned EGM96. Has it been updated to EGM2008 in newer ArcGIS Pro versions?</SPAN></P><P><SPAN>Thank you!</SPAN></P> Wed, 13 Dec 2023 13:18:09 GMT https://community.esri.com/t5/arcgis-pro-questions/wgs84-geoidal-separation-file/m-p/1360230#M76298 RoxFra 2023-12-13T13:18:09Z