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 <[email protected]> wrote: From: Andrew Chapman <[email protected]> Subject: RE: [Qgis-user] Public Sector Mapping Agreement To: "'Noli Sicad'" <[email protected]> Cc: [email protected] 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:[email protected]] Sent: 04 March 2011 05:59 To: Andrew Chapman Cc: [email protected] 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 ________________________________________ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1435/3479 - Release Date: 03/03/11 _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
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