Carson,<br><br>I think that requiring all layers to be on the same CRS for processing makes sense,<br>we can live with that. Perhaps this fact should be stated in the documentation and<br>even in the menu where the user selects reprojection on the fly (for example, adding<br>
"only for display of vector layers") and/or in all fTools menus (and/or fTools could actually check that<br>CRS is consistent across layers and warn the user (rather than preventing him/her of actually performing the operation).<br>
<br>Thanks!<br><br>Agus<br>-------- Original Message -------
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<th align="RIGHT" valign="BASELINE" nowrap>Subject: </th>
<td>Re: CLip and reprojection on the fly</td>
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<td>Thu, 17 Mar 2011 22:08:10 +0000</td>
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<th align="RIGHT" valign="BASELINE" nowrap>From: </th>
<td>Carson Farmer <a href="mailto:carson.farmer@gmail.com" target="_blank"><carson.farmer@gmail.com></a></td>
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<td><a href="mailto:Agustin.Lobo@ija.csic.es" target="_blank">Agustin.Lobo@ija.csic.es</a></td>
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<pre>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,
<a href="http://www.carsonfarmer.com/" target="_blank">http://www.carsonfarmer.com/</a>
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