[Qgis-user] Fwd: Re: CLip and reprojection on the fly

[Agustin Lobo]

Carson,

I think that requiring all layers to be on the same CRS for processing makes
sense,
we can live with that. Perhaps this fact should be stated in the
documentation and
even in the menu where the user selects reprojection on the fly (for
example, adding
"only for display of vector layers") and/or in all fTools menus (and/or
fTools could actually check that
CRS is consistent across layers and warn the user (rather than preventing
him/her of actually performing the operation).

Thanks!

Agus
-------- Original Message -------
 Subject: Re: CLip and reprojection on the fly  Date: Thu, 17 Mar 2011
22:08:10 +0000  From: Carson Farmer
<carson.farmer at gmail.com><carson.farmer at gmail.com>  To:
Agustin.Lobo at ija.csic.es

Hi Agus,
> I've realized that you get an empty clipped layer if
> you use 2 vector layers in different CRS even if reprojection on the
> fly is activated. In other words, clip require both layers to be in
> the same CRS. Is this intentional (it would make sense) or is it
> a bug?
Yes it is intentional. In fact, all fTools functions (where overlay is
relevant) behave this way. When I first created these tools, this
seemed like the best option. I am now starting to think that using 'on
the fly projection' coordinates might be a good feature to have. I
will have to evaluate this further, but for the time being, they do
both have to be in the same (or equivalent) CRSs.

Carson

-- 
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation
National University of Ireland, Maynooth,http://www.carsonfarmer.com/
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