https://community.esri.com/t5/arcmap-questions/transformation-to-alter-radius-circumference/m-p/1027681#M1998 <P>Good day,</P><P>I'm trying to find a way to represent a planet with the following properties:<BR /><SPAN>-RADIUS<BR />&nbsp; 3,980 mi (6,410 km) (equator)</SPAN><BR /><SPAN>&nbsp; 3,960 mi (6,370 km) (poles)</SPAN></P><P><SPAN>If anyone can help me out I would appreciate it greatly..</SPAN></P><P><SPAN>I'm guessing this can be done with a transformation but I don't know enough about creating / altering datums, GCSs, or projections to make this work currently.</SPAN></P><P>&nbsp;</P><P><SPAN>Thanks in advance!</SPAN></P> Wed, 17 Feb 2021 16:58:00 GMT BrandonKnoll 2021-02-17T16:58:00Z https://community.esri.com/t5/arcmap-questions/transformation-to-alter-radius-circumference/m-p/1027681#M1998 <P>Good day,</P><P>I'm trying to find a way to represent a planet with the following properties:<BR /><SPAN>-RADIUS<BR />&nbsp; 3,980 mi (6,410 km) (equator)</SPAN><BR /><SPAN>&nbsp; 3,960 mi (6,370 km) (poles)</SPAN></P><P><SPAN>If anyone can help me out I would appreciate it greatly..</SPAN></P><P><SPAN>I'm guessing this can be done with a transformation but I don't know enough about creating / altering datums, GCSs, or projections to make this work currently.</SPAN></P><P>&nbsp;</P><P><SPAN>Thanks in advance!</SPAN></P> Wed, 17 Feb 2021 16:58:00 GMT https://community.esri.com/t5/arcmap-questions/transformation-to-alter-radius-circumference/m-p/1027681#M1998 BrandonKnoll 2021-02-17T16:58:00Z https://community.esri.com/t5/arcmap-questions/transformation-to-alter-radius-circumference/m-p/1027704#M2001 <P>flattening</P><P><A href="https://en.wikipedia.org/wiki/Reference_ellipsoid#:~:text=That%20is%2C%20f%20is%20the,set%20a%2C%20b%20and%20f." target="_blank">Reference ellipsoid - Wikipedia</A></P><P><A href="https://en.wikipedia.org/wiki/Flattening" target="_blank">Flattening - Wikipedia</A></P><P>or its inverse... some values and formulae within</P> Wed, 17 Feb 2021 17:40:16 GMT https://community.esri.com/t5/arcmap-questions/transformation-to-alter-radius-circumference/m-p/1027704#M2001 DanPatterson 2021-02-17T17:40:16Z