topic Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG? in Developers Questions https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116802#M749 <HTML><HEAD></HEAD><BODY><P>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?</P><P>Thank you</P><P>Paul</P></BODY></HTML> Tue, 03 Nov 2015 12:12:56 GMT StephenDowd 2015-11-03T12:12:56Z Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG? https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116802#M749 <HTML><HEAD></HEAD><BODY><P>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?</P><P>Thank you</P><P>Paul</P></BODY></HTML> Tue, 03 Nov 2015 12:12:56 GMT https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116802#M749 StephenDowd 2015-11-03T12:12:56Z Re: Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG? https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116803#M750 <HTML><HEAD></HEAD><BODY><P><A href="https://community.esri.com/migrated-users/3120">Melita Kennedy</A>​ flagging this one in case you miss it.</P></BODY></HTML> Tue, 03 Nov 2015 12:51:05 GMT https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116803#M750 DanPatterson_Retired 2015-11-03T12:51:05Z Re: Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG? https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116804#M751 <HTML><HEAD></HEAD><BODY><P><SPAN>I suggest looking at examples at </SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=http%3A%2F%2Fspatialreference.org" rel="nofollow" target="_blank">http://spatialreference.org</A></P></BODY></HTML> Tue, 03 Nov 2015 14:47:01 GMT https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116804#M751 curtvprice 2015-11-03T14:47:01Z Re: Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG? https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116805#M752 <HTML><HEAD></HEAD><BODY><P>It can be omitted. We don't use custom authority information right now anyway.</P><P></P><P>Melita</P></BODY></HTML> Tue, 03 Nov 2015 17:12:57 GMT https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116805#M752 MelitaKennedy 2015-11-03T17:12:57Z Re: Does the .prj file require the AUTHORITY tag for a CRS not recognised by ESRI or EPSG? https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116806#M753 <HTML><HEAD></HEAD><BODY><P>Thanks Melita</P><P>Paul</P></BODY></HTML> Wed, 04 Nov 2015 05:19:37 GMT https://community.esri.com/t5/developers-questions/does-the-prj-file-require-the-authority-tag-for-a/m-p/116806#M753 StephenDowd 2015-11-04T05:19:37Z