Coordinate transformations not being applied

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3
11-22-2016 07:27 AM
DanEvans
Occasional Contributor II

I've just spent hours trying to figure out why my feature class in British National Grid (OSGB) coordinates wouldn't line up with any of the Esri Basemaps despite (apparently) having set up the appropriate transformation, attempting to project the feature class etc. etc.

It seems that the transformations I was selecting were not being applied. If I went back to the Data Frame Properties to try a different transformation it had reverted to 'none'. 

Finally I tried copying down the details of the transformation I wanted, and creating a custom transformation with those details, and it worked!

Does anyone know why the built in transformations weren't being applied? Even when I tried to reproject the feature class using the built in transformation the result was still misaligned, but with my custom transformation (specified identically to the built in one), it worked!

Is this a known issue? I'm using ArcMap 10.2.1. Any ideas how to fix this in future?

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3 Replies
JayantaPoddar
MVP Esteemed Contributor

Not sure about 10.2.1 but there had been an issue with 10.2.2, which was fixed by the following patch.

ArcGIS 10.2.2 (Desktop, Engine, Server) Geographic or Datum Transformation Patch



Think Location
DanEvans
Occasional Contributor II

That does sound like a similar issue, but I am definitely using 10.2.1 and it has worked correctly in the past!

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RebeccaStrauch__GISP
MVP Emeritus

This might not have anything to do with it, but just in case..

BTW - I had tested in 10.2.2 and 10.3.x, and I suspect the issue was around for a few more versions.  The description is a little misleading, but basically, things were truncating and/or not being appried.  Mine was in Convert Coordinate Notation, so like I said, might not apply.