[Gvsig_english] trouble with EPSG 2154 and 27561

[Bouillot Michel]

Hello, 

I think that you are right. 

I join shapefiles in both EPSG. 

Thanks for the tests. 

Regards, 

Michel Bouillot 

----- Mail Original ----- 
De: "Juan Lucas Dominguez Rubio" <jldominguez at prodevelop.es> 
À: "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es>, "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es> 
Envoyé: Jeudi 15 Juillet 2010 13:29:45 
Objet: Re: [Gvsig_english] trouble with EPSG 2154 and 27561 



Hello, I think there's a misunderstood. 

gvSIG is able to do on-the-fly reprojection (this is what Michel needs, I think). 

But I'm afraid that, even if he follows the right steps to do it, the result will be wrong because (I think) gvSIG does not know the right parameters to perform that conversion (between EPSG:2154 and EPSG:27561). 

There have been problems with the French projections in the past, and I'm not sure if they were caused by a bug in gvSIG or in the libraries used by gvSIG (especially Proj4). 

Michel: can you please send to the list two little shapefiles (one in EPSG:2154 and the other in EPSG:27561) that should match but do not match in gvSIG? So we can also do some tests. 

Regards, 


Juan Lucas Domínguez Rubio 
--- 
Prodevelop SL, Valencia (España) 

Tlf.: 96.351.06.12 -- Fax: 96.351.09.68 
http://www.prodevelop.es 
--- 


De: gvsig_internacional-bounces at listserv.gva.es en nombre de Bouillot Michel 
Enviado el: jue 15/07/2010 13:02 
Para: Users and Developers mailing list 
Asunto: Re: [Gvsig_english] trouble with EPSG 2154 and 27561 



Hi, 

Thanks for this explanation. 

I find GVSIG very good but in France we have just changed of RS. We begin to have data in the 2 RS. 
The reprojection in the view would be very pactical ! 
Is there a hope for a such function in the futur ? 

Regards 

Michel Bouillot 


----- Mail Original ----- 
De: "Guillermo Tamburini" <tamburini_gui at gva.es> 
À: "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es> 
Envoyé: Jeudi 15 Juillet 2010 12:43:50 
Objet: Re: [Gvsig_english] trouble with EPSG 2154 and 27561 

Hi, 

In fact, you can't correctly represent data in different reference systems in the same View (without reporojecting, it have no sense). 

There are some software applications which applies automatically the reprojection, but it is not the case in gvSIG with vector layers. 

First of all, you have to select the correct RS for your View, and then load the data (the target RS you are going to work). 

Otherwise, you will see your data but in a incorrect situation. In other utm spindle, or displaced... 

If your data is in different RS, you will have to reproject it. Goprocessing tools->Data Conversion->Reproject; the layer in the not current projection to the current projection. 

Regards 


Bouillot Michel wrote: 




Hello, 

I try to open in the same view one shp in EPSG 2154 and one SHP in EPSG 27561 but it don't match correctly. There is a problem with the X like a translation witch have a value who seems to be the difference between Greenwich and Paris meridian. 

How to correct this trouble ? 

regards 

Michel Bouillot 
Chef de projet SIG 
01 48 70 63 23 / michel.bouillot at montreuil.fr 
Ville de Montreuil / Direction Urbanisme et Habitat 
Service Études Développement Urbain 
3, rue de Rosny / 93100 Montreuil 


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-- 
Guillermo Tamburini Beliveau
Proyecto gvSIG 
Consellería de Infraestructuras y Transportes (GVA) 
Valencia (Spain) 
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