topic Definition of Multiple Coordinate Systems in ArcMap Questions https://community.esri.com/t5/arcmap-questions/definition-of-multiple-coordinate-systems/m-p/327021#M741 <HTML><HEAD></HEAD><BODY><P>Hi Everyone,</P><P></P><P>I am posting this question regarding a term called "multiple coordinte system". I firstly see this term in ESRI ArcGIS Web Developer Certification guidnance, and it is shown as "Evaluate the impact of using multiple coordinate system". However, I feel confused here about this term "multiple coordinte system". Does it mean "Multiple" + "Coordinate systems", which from my understanding, e.g. geographic coordinate systems/projected coordinate systems. Or there is a concept callled "Multiple coordinate system" where a feature/asset can have multiple coordinate systems (multi coordinate system models) in the same time so they can change the coordinate on demand (for BIM etc?) I am looking forward for your answer.&nbsp;</P></BODY></HTML> Tue, 08 Jan 2019 09:15:23 GMT HaoYe1 2019-01-08T09:15:23Z Definition of Multiple Coordinate Systems https://community.esri.com/t5/arcmap-questions/definition-of-multiple-coordinate-systems/m-p/327021#M741 <HTML><HEAD></HEAD><BODY><P>Hi Everyone,</P><P></P><P>I am posting this question regarding a term called "multiple coordinte system". I firstly see this term in ESRI ArcGIS Web Developer Certification guidnance, and it is shown as "Evaluate the impact of using multiple coordinate system". However, I feel confused here about this term "multiple coordinte system". Does it mean "Multiple" + "Coordinate systems", which from my understanding, e.g. geographic coordinate systems/projected coordinate systems. Or there is a concept callled "Multiple coordinate system" where a feature/asset can have multiple coordinate systems (multi coordinate system models) in the same time so they can change the coordinate on demand (for BIM etc?) I am looking forward for your answer.&nbsp;</P></BODY></HTML> Tue, 08 Jan 2019 09:15:23 GMT https://community.esri.com/t5/arcmap-questions/definition-of-multiple-coordinate-systems/m-p/327021#M741 HaoYe1 2019-01-08T09:15:23Z Re: Definition of Multiple Coordinate Systems https://community.esri.com/t5/arcmap-questions/definition-of-multiple-coordinate-systems/m-p/327022#M742 <HTML><HEAD></HEAD><BODY><P>It is referring to having different layers in the map with individually different coordinate systems. You can not define multiple coordinate systems for an individual file.</P><P>Regards,</P><P>Jim</P></BODY></HTML> Tue, 08 Jan 2019 13:40:09 GMT https://community.esri.com/t5/arcmap-questions/definition-of-multiple-coordinate-systems/m-p/327022#M742 JimCousins 2019-01-08T13:40:09Z