[Qgis-user] Re: Using CRS to convert from Lat Long to Irish National Grid

[Andre Joost]

Am 27.03.2012 20:14, schrieb Kurt Springs:
> Hi Folks,
>
> I'm in a bit of a pickle.  I am preparing some maps for a grant
> proposal and wanted to add some good vector maps for lakes and
> oceans.  The problem is these vector maps are in latitude/longitude
> and I need to convert them to Irish National Grid.  I tried using
> v.proj in GRASS but ran into problmes (and that is a different list
> group anyway).  After searching the internet I discovered CRS.
>
> I made sure properties was set to IRENET95/Irish Transverse Mercator
> and checked Enable 'on the fly' CRS transformation.  Then I right
> clicked the vector layer and selected "Set Layer CRS" and set it,
> again, for IRENET95/Irish Transverse Mercator.  If I accept what is
> there already as right, all the lakes wound up in South America.  It
> looks like the lat/long numbers didn't convert over.  Is there a way
> to manually move them into position and make it away that this is
> it's right and proper position under IRENET95/Irish Transverse
> Mercator?
>

If the vector data is in lat/lon, you should set the vector layer CRS to 
EPSG:4326, and not the Irish Grid.

HTH,
Andre Joost