topic Re: Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion in ArcObjects SDK Questions https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578025#M15613 <HTML><HEAD></HEAD><BODY><SPAN>Melita:&nbsp; Actually, I need to the calculation formula or component for this conversion for dynamically converting some individual points.&nbsp; Do you have any idea how to get it?&nbsp; Thanks.</SPAN></BODY></HTML> Wed, 08 Jan 2014 10:54:14 GMT ShaningYu 2014-01-08T10:54:14Z Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578022#M15610 <HTML><HEAD></HEAD><BODY><SPAN>I am Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion.&nbsp; If you know the resource, please help.&nbsp; Thanks.</SPAN></BODY></HTML> Tue, 07 Jan 2014 17:12:16 GMT https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578022#M15610 ShaningYu 2014-01-07T17:12:16Z Re: Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578023#M15611 <HTML><HEAD></HEAD><BODY><SPAN>?? </SPAN><BR /><BR /><SPAN>The macro is esriSRGeoTransformation_NAD1983_To_WGS1984_1 but you can always use the well-known ID instead, 1188. You would use it to create a geotransformation that would then be used with the ProjectEx or ProjectEx5 methods.</SPAN><BR /><BR /><SPAN>Melita</SPAN></BODY></HTML> Tue, 07 Jan 2014 18:38:21 GMT https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578023#M15611 MelitaKennedy 2014-01-07T18:38:21Z Re: Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578024#M15612 <HTML><HEAD></HEAD><BODY><SPAN>Thanks for your response.&nbsp; Could you provide the details for the sources?</SPAN></BODY></HTML> Tue, 07 Jan 2014 18:48:11 GMT https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578024#M15612 ShaningYu 2014-01-07T18:48:11Z Re: Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578025#M15613 <HTML><HEAD></HEAD><BODY><SPAN>Melita:&nbsp; Actually, I need to the calculation formula or component for this conversion for dynamically converting some individual points.&nbsp; Do you have any idea how to get it?&nbsp; Thanks.</SPAN></BODY></HTML> Wed, 08 Jan 2014 10:54:14 GMT https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578025#M15613 ShaningYu 2014-01-08T10:54:14Z Re: Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578026#M15614 <HTML><HEAD></HEAD><BODY><SPAN>Then you want the datum transformation equations/algorithms? One place is the EPSG aka OGP Geomatics Committee </SPAN><A class="jive-link-external-small" href="http://www.epsg.org/guides/G7-2.html" rel="nofollow" target="_blank">Guidance Note 7-2</A><SPAN>. This particular transformation uses a "3 parameter" transformation, geocentric translation. Many of the equation-based methods work in 3D Cartesian (XYZ) coordinates so you will have to implement lat/lon/h to/from XYZ converters too.</SPAN><BR /><BR /><SPAN>Melita</SPAN></BODY></HTML> Wed, 08 Jan 2014 17:24:35 GMT https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578026#M15614 MelitaKennedy 2014-01-08T17:24:35Z Re: Looking for arcobjects component for NAD_1983_To_WGS_1984_1 conversion https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578027#M15615 <HTML><HEAD></HEAD><BODY><SPAN>Thanks.&nbsp; Will review the doc.</SPAN></BODY></HTML> Wed, 08 Jan 2014 18:48:56 GMT https://community.esri.com/t5/arcobjects-sdk-questions/looking-for-arcobjects-component-for-nad-1983-to/m-p/578027#M15615 ShaningYu 2014-01-08T18:48:56Z