https://community.esri.com/t5/arcgis-pro-questions/coordinate-conversion-with-add-geometry-attributes/m-p/1149886#M52255 <P>I recently had to convert coordinates into several different coordinate systems and I just now realised when I double-checked the exported table (re-importing it into GIS, data as x,y for different coordinates) that I sometimes had a slight transformation error, where all my points had shifted slightly.</P><P>I did find out that it was due to using "Add geometry attributes" for UTM coordinates while the layer and map frame was in WGS84. I also found out that I can avoid this by:</P><P>a. Changing the map frame CRS</P><P>b. Adding a transformation to the CRS</P><P>c. Projecting the feature class to the UTM</P><P>d. Using Calculate Geometry Attributes instead.</P><P>All of the above gave me slightly different coordinates (in the decimal places). Now my questions are:</P><P>1. Why does Calculate Geometry Attributes work, when Add Geometry Attributes doesn't? What do the two tools do differently?</P><P>2. Which would be the most accurate way to calculate the coordinates? I would have thought to use "Project" and the Calculate Geometry Attributes, however, in my field test, those two points were further apart than the other options.</P> Wed, 02 Mar 2022 20:58:49 GMT IlkaIllers1 2022-03-02T20:58:49Z https://community.esri.com/t5/arcgis-pro-questions/coordinate-conversion-with-add-geometry-attributes/m-p/1149886#M52255 <P>I recently had to convert coordinates into several different coordinate systems and I just now realised when I double-checked the exported table (re-importing it into GIS, data as x,y for different coordinates) that I sometimes had a slight transformation error, where all my points had shifted slightly.</P><P>I did find out that it was due to using "Add geometry attributes" for UTM coordinates while the layer and map frame was in WGS84. I also found out that I can avoid this by:</P><P>a. Changing the map frame CRS</P><P>b. Adding a transformation to the CRS</P><P>c. Projecting the feature class to the UTM</P><P>d. Using Calculate Geometry Attributes instead.</P><P>All of the above gave me slightly different coordinates (in the decimal places). Now my questions are:</P><P>1. Why does Calculate Geometry Attributes work, when Add Geometry Attributes doesn't? What do the two tools do differently?</P><P>2. Which would be the most accurate way to calculate the coordinates? I would have thought to use "Project" and the Calculate Geometry Attributes, however, in my field test, those two points were further apart than the other options.</P> Wed, 02 Mar 2022 20:58:49 GMT https://community.esri.com/t5/arcgis-pro-questions/coordinate-conversion-with-add-geometry-attributes/m-p/1149886#M52255 IlkaIllers1 2022-03-02T20:58:49Z https://community.esri.com/t5/arcgis-pro-questions/coordinate-conversion-with-add-geometry-attributes/m-p/1149897#M52259 <P><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/calculate-geometry-attributes.htm" target="_blank">Calculate Geometry Attributes (Data Management)—ArcGIS Pro | Documentation</A></P><P><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/add-geometry-attributes.htm" target="_blank">Add Geometry Attributes (Data Management)—ArcGIS Pro | Documentation</A></P><P>Calculate Geometry supports geographic transformations as an environment variable.&nbsp; It&nbsp; would be the one that I use should I need to perform a projection and transformation.&nbsp; You will have to compare for any subtle differences in the other geometry returned parameters, or examine the scripts for other differences in parameters and arc* stuff used</P><P>C:\...Your_install_folder ...\Resources\ArcToolBox\Scripts</P> Wed, 02 Mar 2022 21:12:54 GMT https://community.esri.com/t5/arcgis-pro-questions/coordinate-conversion-with-add-geometry-attributes/m-p/1149897#M52259 DanPatterson 2022-03-02T21:12:54Z