Setting a custom projection for each page of a map series (custom WKT string)

[magenta744]

Hi everyone, I'm creating a map series of the world with one map per country. I'd like each map have a custom orthographic projection where the country in question is centred.

I understand that you can set a Spatial Reference field for the map series, which I have set up. I was planning on using a WKT string in this field (if this is the correct syntax) to define the projection for each map.

What should this string look like for an orthographic projection centred on X and Y? Also, what format should the Spatial Reference field be - just text? Once I have the syntax, generating the X and Y values should be no problem. I have no experience with this or with Arcade or anything like that.

Thank you!

[AdrianWelsh]

This sounds very interesting and I'd love to see the final product!

My guess is to not use the WKID but to use the official title of the coordinate system from the details

I haven't tried this but that would be what I would suspect. I am curious to hear what you find out from this! 

And, you have to be sure that you are using a Spatial map series for this. Looking at this documentation, that is the only support for coordinate systems.
https://pro.arcgis.com/en/pro-app/latest/help/layouts/map-series.htm