https://community.esri.com/t5/arcmap-questions/transformation/m-p/1091934#M2900 <P>Hello,</P><P>I found some discrepancies while converting datums in ArcMap and NOAA transformation Tools (<A href="https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgeodesy.noaa.gov%2FNCAT%2F&amp;data=04%7C01%7CCTurlington%40Geosyntec.com%7C58abd80b1af04573779d08d95cd5bb4a%7C7125495671b047f48977c4c17bc205cb%7C0%7C0%7C637642895323405298%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=NtRPodAPRLDj6f%2FkOxypV3SSNODbQnmlyv%2F6uKieBsk%3D&amp;reserved=0" target="_blank" rel="noopener">https://geodesy.noaa.gov/NCAT/</A>). The easting seems to match but Northing is approximately 3ft off. I used NAD 1983 (2011) (US Feet) Delaware State Plane in both conversions. Can someone help me to understand the reason for this discrepancy?</P> Tue, 24 Aug 2021 19:52:58 GMT ChuckTurlington 2021-08-24T19:52:58Z https://community.esri.com/t5/arcmap-questions/transformation/m-p/1091934#M2900 <P>Hello,</P><P>I found some discrepancies while converting datums in ArcMap and NOAA transformation Tools (<A href="https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgeodesy.noaa.gov%2FNCAT%2F&amp;data=04%7C01%7CCTurlington%40Geosyntec.com%7C58abd80b1af04573779d08d95cd5bb4a%7C7125495671b047f48977c4c17bc205cb%7C0%7C0%7C637642895323405298%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=NtRPodAPRLDj6f%2FkOxypV3SSNODbQnmlyv%2F6uKieBsk%3D&amp;reserved=0" target="_blank" rel="noopener">https://geodesy.noaa.gov/NCAT/</A>). The easting seems to match but Northing is approximately 3ft off. I used NAD 1983 (2011) (US Feet) Delaware State Plane in both conversions. Can someone help me to understand the reason for this discrepancy?</P> Tue, 24 Aug 2021 19:52:58 GMT https://community.esri.com/t5/arcmap-questions/transformation/m-p/1091934#M2900 ChuckTurlington 2021-08-24T19:52:58Z