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Hi all, I'm attempting to set up a custom XFORM_DEF to move between CSRS (1997) and CSRS (2010) using the grid shift file CVG69710.gsb provided by NRCAN, and I'm having trouble getting it to show up in FME Options > Coordinate Systems. I was wondering if anyone might have experience setting up this transformation or if anyone could otherwise spot what might be going wrong.

I've placed the grid shift file in Reproject\\GridData\\Canada and placed this definition in the bottom of the MyCoordSysDefs.fme file. I also did a test by uncommenting the ASTRLA66-Grid_to_GDA94 XFORM_DEF in the same file and it shows up in Workbench without issue.

Here is my custom definition:

I was thinking that perhaps I need another datum to represent either CSRS (1997) or CSRS (2010), but I'm not really sure. There seems to be some ambiguity surrounding the representation of different CSRS realizations within the EPSG code system and I am unsure which is being represented by the CSRS datum I'm referencing in my definition here.

 

Any help is greatly appreciated!

Hi @k_lander,

The CSRS datum in FME is assumed to be CSRS (1997). To do this transformation, you will need to define a CSRS_2010 datum, then use that as the target datum in the transformation. You will also need to define a copy of the coordinate system you are working in, with its datum set to CSRS_2010.

With these definitions created, using the CsmapReprojector to reproject from the existing coordinate system to the new CSRS_2010 coordinate system will apply the transformation for you.

Hi @k_lander,

The CSRS datum in FME is assumed to be CSRS (1997). To do this transformation, you will need to define a CSRS_2010 datum, then use that as the target datum in the transformation. You will also need to define a copy of the coordinate system you are working in, with its datum set to CSRS_2010.

With these definitions created, using the CsmapReprojector to reproject from the existing coordinate system to the new CSRS_2010 coordinate system will apply the transformation for you.

Hi @daveatsafe, many thanks, you've got me on the right track now.

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