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Coordinate System Shift between 2021.1 and 2022.1

warrendev
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We recently upgraded from FME Desktop and Server 2021.1 to 2022.1 and are now noticing about a 3' shift while using the Reprojector and CsmapReprojector. The shift is not present while using the ESRIReprojector and PROJReprojector.

 

In this example scenario I've attached workspaces for both version and shapefile outputs of the coordinates. The workspace has not been modified and has been ran in each version to generate shapefiles for reference that contain the coordinate values that differ between the two. We are going from NSRS11.LL to TX83-CF. Is there anything specific that has changed in the newer version that I might be missing when handling certain reprojections?

 

Both workspaces have reprojection engine set to FME.

 

shift 

 

 

 

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Best answer by warrendev 22 July 2022, 23:16

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warrendev
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After researching this some more and working with test data, I found this message in the 2021 version regarding which transformation that was selected. So it was just that the transformation that was used had changed between the versions.

 

2021.1 FME

CS-MAP Reprojector: Transformation will be automatically selected for 'LL83_2011' -> 'TX83-CF', and is not guaranteed to remain the same in future releases of FME
 
Reprojector: Using transformation `NAD83_to_WGS84,Forward(Null,EPSG:1188)' when reprojecting from LL83_2011 to TX83-CF
 
Reprojector: Using transformation `NAD83_to_WGS84,Inverse(Null,EPSG:1188)' when reprojecting from LL83_2011 to TX83-CF

I then looked at the 2022.1 version and read this message in the log file.

 

2022.1 FME

CS-MAP Reprojector: Transformation will be automatically selected for 'LL83_2011' -> 'TX83-CF', and is not guaranteed to remain the same in future releases of FME
Reprojector: Using transformation `WGS_1984_ITRF08_TO_NAD_1983_2011,Inverse(Bursa Frame Rotation)' when reprojecting from LL83_2011 to TX83-CF
Reprojector: Using transformation `NAD83_to_WGS84,Inverse(Null,EPSG:1188)' when reprojecting from LL83_2011 to TX83-CF

 

panda
Rank
Badge +13

If you have used TX83-CF as coordinate system in previous version and notice in data shift, try use NSRS11.TX-CF instead. This will put it in the correct spot. Looks like transformation that apply to the non-2011 coordinate system version has been change and we not sure how apply change to transformation currently.

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