topic Differences between EPSG 4170 and EPSG 4674 in Coordinate Reference Systems Questions https://community.esri.com/t5/coordinate-reference-systems-questions/differences-between-epsg-4170-and-epsg-4674/m-p/857452#M1546 <HTML><HEAD></HEAD><BODY><P>I'm currently creating a spatial database using Oracle Spatial and it lists both EPSG 4170 and EPSG 4674 as SIRGAS for SDO_GEOMETRY type.</P><P>The problem is when I try to transform from WGS 84 (EPSG 4326) to SIRGAS. If my table is defined as EPSG 4674, I get an error about different dimensions. If my table is defined as EPSG 4170, the transformation works.</P><P>Because of that, all my tables metadata are currently defined as EPSG 4170.</P><P><BR />But what are the differences between EPSG 4170 and 4674? Should I expect any displacement by storing data defined as 4674 in 4170 without transforming it?</P></BODY></HTML> Tue, 10 Jan 2017 15:55:39 GMT BrunoMendes 2017-01-10T15:55:39Z Differences between EPSG 4170 and EPSG 4674 https://community.esri.com/t5/coordinate-reference-systems-questions/differences-between-epsg-4170-and-epsg-4674/m-p/857452#M1546 <HTML><HEAD></HEAD><BODY><P>I'm currently creating a spatial database using Oracle Spatial and it lists both EPSG 4170 and EPSG 4674 as SIRGAS for SDO_GEOMETRY type.</P><P>The problem is when I try to transform from WGS 84 (EPSG 4326) to SIRGAS. If my table is defined as EPSG 4674, I get an error about different dimensions. If my table is defined as EPSG 4170, the transformation works.</P><P>Because of that, all my tables metadata are currently defined as EPSG 4170.</P><P><BR />But what are the differences between EPSG 4170 and 4674? Should I expect any displacement by storing data defined as 4674 in 4170 without transforming it?</P></BODY></HTML> Tue, 10 Jan 2017 15:55:39 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/differences-between-epsg-4170-and-epsg-4674/m-p/857452#M1546 BrunoMendes 2017-01-10T15:55:39Z Re: Differences between EPSG 4170 and EPSG 4674 https://community.esri.com/t5/coordinate-reference-systems-questions/differences-between-epsg-4170-and-epsg-4674/m-p/857453#M1547 <HTML><HEAD></HEAD><BODY><P>According to EPSG..</P><P>Wkid 4674 is called SIRGAS2000 (and uses the ITRF200 epoch).</P><P>4170 is called SIRGAS1995 (and uses ITRF 1994).</P><P></P><P>I would say that both are "functionally equivalent" to WGS84.</P><P>Unless your data is extraordinarily accurate, I don't think you will see any miss-alignment between them.</P></BODY></HTML> Tue, 10 Jan 2017 16:46:10 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/differences-between-epsg-4170-and-epsg-4674/m-p/857453#M1547 NeilAyres 2017-01-10T16:46:10Z