AnsweredAssumed Answered

Why is the projection upside down

Question asked by simon.ross on Nov 9, 2016
Latest reply on Nov 15, 2016 by GSCUser85

Does anyone know why the south African national grid projections display upside down in ArcMap?  ESRI appear to have deviated from the standard EPSG definitions by inverting the scale factor.  If I customise the scale factor then it displays the correct way up again.  In desktop this is fine but on the web it is causing me issues


For example I have some data that is correct if using EPSG definition 2054.  The ESRI definition with the same coordinate system but inverted scale factor is 102488.  Unfortunately my coordinate data is in a third party system and I'd prefer not to edit it.  The WKID is stored in that system as 2054.  Unfortunately the out of the box geometry server does not include 2054 as a definition so on projecting in a webmap it fails to recognise the WKID and puts the data at the same coordinate location in web Mercator (middle of the atlantic ocean)


I presume there is some specific reason why the projections have been configured this way but at the moment without either customising my geometry server or changing my coordinate data it simply doesn't work online.  I'm resigned to the fact that I probably need to make one of these changes but would really like to understand the reasoning behind this deviation from EPSG




(Willing to bet it will be Melita that picks this one up!)