https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127389#M49177 <P>Australian GDA94: Is this a Geographic Coordinate System?</P><P>Then, you need to use <A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/define-projection.htm" target="_self">Define Projection</A> to the layers with Australian GDA94 Coordinate System. Define their coordinate system as Geocentric Datum of Australia 1994.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="JayantaPoddar_0-1639805976356.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/29986i4D0AF3FC3E4EABC7/image-size/medium?v=v2&amp;px=400" role="button" title="JayantaPoddar_0-1639805976356.png" alt="JayantaPoddar_0-1639805976356.png" /></span></P><P>Once this is done, you should see the appropriate transformation method(s).</P> Sat, 18 Dec 2021 05:44:15 GMT JayantaPoddar 2021-12-18T05:44:15Z https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127385#M49174 <P>Hi Esri Community</P><P>I have an issue with a Datum Transformation. A datum transformation can not be found in Australian GDA94 to GDA2020.<BR />I downloaded and installed "ArcGIS Coordinate Systems Data" from My Esri and restart the computer, but the issue persists. In the dropdown list appear "None". Could you please help me with how to fix it?</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Greta_0-1639802864614.png" style="width: 653px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/29985i1728E5A1C2DA9666/image-dimensions/653x320?v=v2" width="653" height="320" role="button" title="Greta_0-1639802864614.png" alt="Greta_0-1639802864614.png" /></span></P><P>&nbsp;</P> Sat, 18 Dec 2021 04:55:44 GMT https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127385#M49174 Greta 2021-12-18T04:55:44Z https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127387#M49176 <P>I suspect related to your concern</P><P><A href="https://community.esri.com/t5/coordinate-reference-systems-blog/gda2020-amp-wgs84-web-gis/ba-p/1063914" target="_blank">GDA2020 &amp; WGS84 (Web GIS) - Esri Community</A></P> Sat, 18 Dec 2021 05:39:30 GMT https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127387#M49176 DanPatterson 2021-12-18T05:39:30Z https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127389#M49177 <P>Australian GDA94: Is this a Geographic Coordinate System?</P><P>Then, you need to use <A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/define-projection.htm" target="_self">Define Projection</A> to the layers with Australian GDA94 Coordinate System. Define their coordinate system as Geocentric Datum of Australia 1994.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="JayantaPoddar_0-1639805976356.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/29986i4D0AF3FC3E4EABC7/image-size/medium?v=v2&amp;px=400" role="button" title="JayantaPoddar_0-1639805976356.png" alt="JayantaPoddar_0-1639805976356.png" /></span></P><P>Once this is done, you should see the appropriate transformation method(s).</P> Sat, 18 Dec 2021 05:44:15 GMT https://community.esri.com/t5/arcgis-pro-questions/datum-transformation-issue/m-p/1127389#M49177 JayantaPoddar 2021-12-18T05:44:15Z