topic Measure tool: Measurement modes/Units in ArcGIS Pro Questions https://community.esri.com/t5/arcgis-pro-questions/measure-tool-measurement-modes-units/m-p/1282895#M68423 <P>Using the Measure tool, I see there are 4 Measurement modes, including 'Geodesic' which I think of as being related to "Geographic coordinate systems", and 'Planar' which I think of as being related to "Projected coordinate systems" ...Is this concept correct?</P><P>...But, what dictates which of these are available to use? I ask because sometimes I see 'Planar' grayed-out -- even when the Current Map Coordinate System is set to a Projected Coordinate System.</P><P>With this, I've sometimes noticed that my measurements are quite different than a colleague for the same thing ...even over short distances. I also notice differences with this same person/computer when 'calculating geometry' for a field ...so there appears to be some relation here?</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Wed, 26 Apr 2023 16:22:42 GMT Craig_Eissler_Iceman 2023-04-26T16:22:42Z Measure tool: Measurement modes/Units https://community.esri.com/t5/arcgis-pro-questions/measure-tool-measurement-modes-units/m-p/1282895#M68423 <P>Using the Measure tool, I see there are 4 Measurement modes, including 'Geodesic' which I think of as being related to "Geographic coordinate systems", and 'Planar' which I think of as being related to "Projected coordinate systems" ...Is this concept correct?</P><P>...But, what dictates which of these are available to use? I ask because sometimes I see 'Planar' grayed-out -- even when the Current Map Coordinate System is set to a Projected Coordinate System.</P><P>With this, I've sometimes noticed that my measurements are quite different than a colleague for the same thing ...even over short distances. I also notice differences with this same person/computer when 'calculating geometry' for a field ...so there appears to be some relation here?</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Wed, 26 Apr 2023 16:22:42 GMT https://community.esri.com/t5/arcgis-pro-questions/measure-tool-measurement-modes-units/m-p/1282895#M68423 Craig_Eissler_Iceman 2023-04-26T16:22:42Z