[Qgis-user] Hi everybody

[Gerardo Jimenez]

It is not about just changing the prj (as I understand your last mail). You have to choices, using on the fly transformation an reprojecting. When you use on the fly transformation you data doe not change, data with different crs are displayed as if they did not have different crs. On the other hand reprojecting means transforming data form one crs to another. For instance transforming from lat lon data (coordinates in degrees) to another crs that defines the units (among other parameters) in meters. As I posted before:
"if you want all your layers in the same crs you have to reproject your data. This is easy, load a layer, select it and choose save as, there you have to define a new name and the crs of your choice. One thing, in order that the reprojection could succeed  both the project and the layer must have the same crs (see my previous post)"
What about reprojecting the layer in degrees? Can you share de data to see what is going on? In my computer I am able to reproject and to use on the fly transformation....
Gerardo Jiménez Delgado
Instituto de Investigaciones Antropológicas
Universidad Nacional Autónoma de México
Ciudad Universitaria s/n
Coyoacan 04510
Mexico City
Mexico

56 22 95 16

Date: Wed, 28 Dec 2011 10:27:54 +0000
From: giacomofontanelli at yahoo.it
Subject: Re: [Qgis-user] Hi everybody
To: gejst5 at hotmail.com

The situation doesn't change whatever .prj file you put in each layer. The problem is even the same: Qgis reads the extension of 4 layers in meters and reads the extension of one layer in degrees. Thanx 
       Da: Gerardo Jimenez <gejst5 at hotmail.com>
 A:
 qgis-user at lists.osgeo.org 
 Inviato: Martedì 27 Dicembre 2011 18:55
 Oggetto: RE: [Qgis-user] Hi everybody
  




If you have a shape file it should have also a *.prj file. This file defines the projection of your layer. By default, Qgis assumes that your data is a lat lon wgs84 and coordinate units degrees. If you have your *.prj file try this first
Open QGis, load the layer select it and choose set project crs from layer
If that does not do the trick try opening the prj file in a text editor and try to identify your CRS (Coordinate Reference System). Then, in Qgis, after loading your layer, Go to layer properties/General choose the specify button and look for your crs in the "Projected Coordinate Systems" section. Do the same at Settings/Project Properties/CRS Tab.
Hope it helps

Gerardo Jiménez Delgado
Instituto de Investigaciones Antropológicas
Universidad Nacional Autónoma de México
Ciudad Universitaria s/n
Coyoacan 04510
Mexico City
Mexico

56 22 95 16

Date: Tue, 27 Dec 2011 15:09:00 +0000
From: giacomofontanelli at yahoo.it
To: qgis-user at lists.osgeo.org
Subject: [Qgis-user] Hi everybody

Hi, I'm Giacomo Fontanellin from Florence, Italy.I'm a PhD for University of Basilicata, I work on remote sensing of environment.I'm quite new with QGis, buti I like it, cause it's very easy to use and user-friendly. This is my problem: I've got many shape file in a project, each of those with different projections,
 but I still can visualize the polygons in the right position. The spatial extension of the files is almost the same and is defined in meters: example: xMin, yMin 1714882.75,4845790.12 : xMax,yMax 1735233.69,4861856.86.

Unfortunally I've got a layer with the spatial extension defined in degrees: xMin, yMin 10.94,43.7388 : xMax,yMax 11.7543,43.9773, and I can't visualize it in the correct location. How can I change the extension of the files from degrees to meters and viceversa? Thank you very much and sorry for my english
  
_______________________________________________
Qgis-user mailing list
Qgis-user at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user 		 	   		  

_______________________________________________
Qgis-user mailing list
Qgis-user at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user


     		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20111228/c8180cae/attachment.html>