Details Ticket 2626


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Serial Number 2626
Subject on the fly reprojection with .prj projection
Area wish
Queue grass
Requestors pvmstg@hotmail.com
Owner none
Status open
Last User Contact Fri Sep 17 17:05:23 2004 (4 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Fri Sep 17 17:05:23 2004 (4 yr ago)
Created Fri Sep 17 16:49:47 2004 (4 yr ago)

Transaction History Ticket 2626


Fri, Sep 17 2004 16:49:47    Request created by guest  
Subject: on the fly reprojection with .prj projection

Platform: other osX
grass obtained from: Other (CDROM etc) from http://wwwamb.bologna.enea.it/forgrass/
grass binary for platform: Downloaded precompiled Binaries
GRASS Version: 5,7

Arcview use in v8 and 9 .prj files to specified the projection of a shapefile.
This allow the view to be 
independant from shape projection.  You may have many projections of shapefile
like geographical, 
utm and other and choose to make the view in utm.  If not specified (no .prj)
geographical is the 
defaut.

If grass could support this feature it could be a verry good improvement.  No
need to reproject files 
receive from many source.  Just be sure each shape have is own .prj file.

With it and utility to make that .prj files for shape without that .prj is also
needed.
Fri, Sep 17 2004 17:05:23    Mail sent by paul-grass@stjohnspoint.co.uk  
Return-Path <paul-grass@stjohnspoint.co.uk>
Delivered-To grass-bugs@lists.intevation.de
Date Fri, 17 Sep 2004 16:05:18 +0100 (BST)
From Paul Kelly <paul-grass@stjohnspoint.co.uk>
To Request Tracker <grass-bugs@intevation.de>
Cc grass5@grass.itc.it
Subject Re: [GRASS5] [bug #2626] (grass) on the fly reprojection with .prj projection
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Message-ID <Pine.LNX.4.60.0409171600520.6267@agrippa.ukshells.co.uk>
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On Fri, 17 Sep 2004, Request Tracker wrote:

> Arcview use in v8 and 9 .prj files to specified the projection of a shapefile.
This allow the view to be
> independant from shape projection.  You may have many projections of shapefile
like geographical,
> utm and other and choose to make the view in utm.  If not specified (no .prj)
geographical is the
> defaut.
>
> If grass could support this feature it could be a verry good improvement. 
No need to reproject files
> receive from many source.  Just be sure each shape have is own .prj file.

That would be a nice feature for v.external but I have never used it so 
can't go into detail. Only that if the external OGR file had no projection 
information it should not assume lat/long---there should be a warning 
and/or ask the user is it OK to interpret the map as being in the same 
projection as the current location.

>
> With it and utility to make that .prj files for shape without that .prj is
also needed.

That exists already: see the man page for g.proj
v.out.ogr also writes a .prj file when creating a Shapefile.


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