I'm not sure if this is the issue but the preferred way to change a file
into an url is to use the Urls.toUrl method.

Ian

On Tue, 24 Jul 2018, 21:46 Stanislav Dušek, <dusek.stan...@gmail.com> wrote:

> Hello,
>
> I'm trying to use GeoTools to calculate the grid coverage based on NTv2
> .gsb file.
> However, I'm unable to create the instance of NTv2Transform.
> When I use this piece of code:
>
>     File gridFile = new File("C:\\Dev\\VTS\\Grids\\WA\\wohpgn.gsb");
>     NTv2Transform transform = new NTv2Transform(gridFile.toURI());
>
> I get this exception:
>
>     Exception in thread "main"
> org.opengis.referencing.NoSuchIdentifierException: Could not locate NTv2
> Grid File file:/C:/Dev/VTS/Grids/WA/wohpgn.gsb
>         at
> org.geotools.referencing.operation.transform.NTv2Transform.<init>(NTv2Transform.java:105)
>         at
> com.frequentis.example.Main.transformFromNad27UsingGrid(Main.java:75)
>         at com.frequentis.example.Main.main(Main.java:90)
>
> Am I using the syntax properly?
> Is there some other way of how to achieve that?
> Do you know about some workaround?
>
> Btw, I was trying it with versions 18.4 and 19.1 with Maven.
>
> Thank you,
> Stanislav
>
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