topic Customising the data frame spatial reference in Coordinate Reference Systems Questions

Customising the data frame spatial reference

BenLeslie1 — Tue, 22 Jun 2021 08:47:31 GMT

ArcDesktop 10.2.2. Coordinate system: WGS84.

I want to view the map of the world to that the centre is at 180 degrees instead of zero - as discussed by Chris Fox in this post https://community.esri.com/ideas/1132 . He mentions that this can be done by customising the spatial reference but I can't find the controls to do it - can someone walk me through it?

i.e. so my map looks like 2 instead of 1.

Re: Customising the data frame spatial reference

DanPatterson_Retired — Tue, 09 Aug 2016 11:55:17 GMT

this one How To: Project a data frame to a custom coordinate system with a non-Greenwich central meridian

Re: Customising the data frame spatial reference

JenniferMcCall4 — Tue, 09 Aug 2016 12:08:08 GMT

Hi Ben,

I believe since at least 10.1 you can open the Data Frame properties, go to the coordinate system tab, right-click the projection you want and choose "Copy and Modify". Here, you can re-name the projection and alter the Central Meridian property to 180.

Re: Customising the data frame spatial reference

BenLeslie1 — Tue, 09 Aug 2016 13:02:08 GMT

Thanks - got there in the end.

Dan's method seems to refer to v8 & 9 - my Catalogue tab doesn't seem to metion coordinate systems.

The "Copy and Modify" method was not sufficiently intuitive for me so, for anyone else with this question, here's what I did:

1. Make a new copy of WGS84.prj in windows explorer

2. Open it in a text editor and change the prime meridian to 180.

3. In the Coordinate system tab of the Dataframe properties click on little globe symbol and Import...

4. Select Transformations, then New... and change the "X Axis Translation (meters)" to 180.

note: this give the desired 180 degree translation even though the dialog suggests that the translation is in metres.

and I don't understand why you have to change the prime meridian and set a translation...