[Qgis-user] Public Sector Mapping Agreement

[pcreso at pcreso.com]

Hi Andrew,

A gz file is simply a zip file containing compressed files. In this case compressed GML files. On Linux, gunzip <file.gz> will extract them, on Windows most unzipping utilities will decompress & extract the contents.

The uncompressed files do not appear to have a gml suffix, but if QGIS is set to open "all files" instead of just a specified type, it can determine the file type from the file contents & open them using OGR.
 
I don't see any reason for QGIS to work wth compressed archive files directly, users can easily extract the contents & then open with QGIS.

OGR can convert to shapefiles, or load into a database, but neither of these is a QGIS specific role, and I'm not sure a QGIS howto is the appropriate place for an introduction to spatial data mgmt. This would be better done by pointing at a PostGIS tutorial.

Cheers

Brent Wood

--- On Mon, 3/28/11, Andrew Chapman <andrew.chapman at donkagen.co.uk> wrote:

From: Andrew Chapman <andrew.chapman at donkagen.co.uk>
Subject: RE: [Qgis-user] Public Sector Mapping Agreement
To: "'Noli Sicad'" <nsicad at gmail.com>
Cc: qgis-user at lists.osgeo.org
Date: Monday, March 28, 2011, 3:55 AM

Hi Noli

Ordnance Survey has confirmed that the best URL for sample files is
http://www.ordnancesurvey.co.uk/oswebsite/products/innovations/discoverdata.
html#mastermap.

Andrew
________________________________________
From: Noli Sicad [mailto:nsicad at gmail.com] 
Sent: 04 March 2011 05:59
To: Andrew Chapman
Cc: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Public Sector Mapping Agreement

Hi Andrew,

> To encourage take-up for both GIS and QGIS, it may help if there were
> tutorials to take a new user of GIS through the steps to download data
from
> Ordnance Survey (probably only in GZ format for the topology layers).
> To date I've been getting data as shapefiles - when I last tried (an
earlier
> version) QGIS wouldn't load .gz and the support for .gml may have been
> incomplete.
> Is anyone else using Ordnance Survey .gz files directly?
> Would the best advice for users new to GIS be to convert to shapefiles or
> use a database (something I've not yet managed to do)?
> Are there any UK users involved with town or parish councils?

I think it would be wise to put an example of this OS gz file so we
can try if we can open it with QGIS. Just a very simple example of the
file :-).

Then, post the URL where we can  download it.

Noli 
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