Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG?

[StephenDowd]

I am writing shapefile sets for CRSs that are not always in the EPSG database. It seems that ArcGIS does not accept the AUTHORITY tag unless it references a valid code e.g. AUTHORITY["EPSG", "2000"]. Does the PE require this tag or can it be omitted under these circumstances? If not then which strings should it contain?

Thank you

Paul

[DanPatterson_Retired]

Melita Kennedy​ flagging this one in case you miss it.

[curtvprice]

I suggest looking at examples at http://spatialreference.org

[MelitaKennedy · Accepted solution]

It can be omitted. We don't use custom authority information right now anyway.

Melita

[StephenDowd]

Thanks Melita

Paul