[Qgis-user] Public Sector Mapping Agreement

[Saber]

Andrew

I opened a thread on QGIS forum and posted screenshots of the example of
Mastermap from OS with Google layer background and some labeling.

These might help:
 - If you are using Windows, for uncompressing files you can use PeaZip
which is free and open source as opposed to WinZip which is a shareware.

 - I noticed gml is a bit slow. It might help to convert the files to
spatialite which you can edit in QGIS and does not have some of shapefile
limitations.

 - The orientation was fine for me. (Check the flow direction on the first
image.)

Cheers
Saber



> I have old sample OS .gz files, but it would be best to use their current
> ones. The data SHOULD be available via the "Download our sample data"
> section at www.ordnancesurveymastermap.com/ (I can't find a direct link to
> files), but it wouldn't work when I tried. I've reported the problem to OS
> and am waiting for a human response.
> A further source of additional information is the OS XML Schema
> Respository
> www.ordnancesurvey.co.uk/oswebsite/xml/schema/index.html, but I don't know
> enough about QGIS to understand how to use these.
> I've tried an old sample .gz file with both 1.6 and 1.7. Neither version
> supports direct opening of .gz (which would be the simplest way for new
> users), but actually open the unzipped .gml files. I have had problems in
> the past with older versions of WinZip (e.g. 12.0) where they couldn't
> unzip
> this format correctly, but gzip or other alternatives worked. The latest
> WinZip (15.0.) also seems to work, although you have to enter the
> extension
> of the file to expand, as it doesn't know to add .gml.
> Unless the latest format has changed, OS uses the 'orientation' attribute
> for text angle, but the value seems to be (degrees * 10). The loaded GML
> layer doesn't allow editing, so it isn't possible to add a further
> attribute
> calculated from 'orientation'. Saving as a shapefile under 1.6 fails with
> an
> error because, when the longer GML attribute names are trimmed to ten
> significant characters, there are duplicate attribute names.
>
> 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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