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Problem installing Canada NTv2 grid files

  • November 15, 2019
  • 3 replies
  • 62 views
maphew
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How to install NTv2 grid files?

Following the instructions at http://docs.safe.com/fme/2019.0/html/FME_Desktop_Documentation/FME_Workbench/Workbench/options_coordinate_systems.htm I've copied the `NTV2_0.GSB` file I acquired from NRCAN into "C:\\Program Files\\FME\\Reproject\\GridData\\NTv2".

From FME Options I select Coordinate Systems. Now what? Which of the listed items do I edit?

I tried NAD83_to_CSRS. I'm able to use the down arrow to select the NTV2_0.GSB file from previous step, but the [OK] button remains disabled.

3 replies

maphew
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  • maphew
  • Author
  • November 15, 2019
Ok button solved. You need to delete the extra red rows.

 

(I didn't create them, they were there the first time I opened the Edit dialog)

 

maphew
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  • maphew
  • Author
  • November 15, 2019

After a nights sleep I realized NAD83_to_CSRS is the wrong selection for the NRCAN ntv2 files, they're meant for NAD27 to 83 transforms. However when I went to add it to NAD27_to_NAD83_Canada_FME instead I discovered the grid shift file was already there and set!

It would be nice if http://docs.safe.com/fme/2019.0/html/FME_Desktop_Documentation/FME_Workbench/CoordSys/Included_Grid_Shift_Files.htm were updated to reflect this. (The page does currently say NAD27<->NAD83 grid shift files are included, but doesn't say they are NTv2.)

 

nampreetatsafe
Safer
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maphew wrote:

After a nights sleep I realized NAD83_to_CSRS is the wrong selection for the NRCAN ntv2 files, they're meant for NAD27 to 83 transforms. However when I went to add it to NAD27_to_NAD83_Canada_FME instead I discovered the grid shift file was already there and set!

It would be nice if http://docs.safe.com/fme/2019.0/html/FME_Desktop_Documentation/FME_Workbench/CoordSys/Included_Grid_Shift_Files.htm were updated to reflect this. (The page does currently say NAD27<->NAD83 grid shift files are included, but doesn't say they are NTv2.)

 

Hi @maphew: I'm sorry that it would have saved you time if we included the NTv2 info in the documentation. I've logged a request to our publications team about this suggestion. Thanks for your input!

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