[Qgis-user] Bugs

Thu Jul 7 07:27:28 PDT 2011

I recommend some of your comments for changes/incorporated ideas be directed
to the qgis developer list-serv. This listserv is primarily utilized by
users of the program for quick help and questions. Although I'm sure some of
the developers peruse it .

I agree with Andreas. When it comes to open-source software there can
generally be some issues with proprietary formats. When the formats are
changed, or the distribution arrangements are altered, there is usually some
period of time lapse before they can adequately be adopted. If this is an
issue, I recommend communicating your concerns with those companies that
provide the formats and encourage them to standardize in a fashion that can
easily be utilized by the open source community.

Personally, I generally convert all my ECW's to another format in case the
SDK changes again (which is the problem many users are currently dealing
with).

On Thu, Jul 7, 2011 at 10:10 AM, <jonathanmoules at warwickshire.gov.uk> wrote:

> Hi Andreas, Nathan
>         Thanks for the prompt Replies.
>
>
> > the infrastructure was just changed recently. Did you try on
> http://hub.qgis.org/- personally I don't know how the accounts are
> handled. The old accounts from trac.osgeo.org were migrated.
>
> This in turn points to the same bugs page. It allows "sign in", but there's
> no "register" button that I can see.
>
>
> >  Personally, I would really stay away from proprietary formats like ecw
> and mrsid.
>
> In principle I agree, but this is one of the few formats that's supported
> across all our applications internally (the other being JP2000), so it's
> what we've put our data into. We can easily convert the data into pretty
> much any raster format at any time as it's almost all sourced from Ordnance
> Survey TIF's, but we'd prefer not to have multiple versions of each raster.
> JP2000 seems to be a fairly open standard (it's ISO defined), even if it
> doesn't have much uptake.
>
>
> I've found a smaller ECW file - 27MB. QGIS hangs for a little over a minute
> when loading this. Extrapolating that up to the 4GB file gives 2.5hrs to
> load it! QGIS is also using an absurd amount of RAM (~700MB) just to display
> this single layer. ArcMap tells me this file is 260.35 MB uncompressed.
>
> However, following Nathan's suggestion, I have disabled the "Contrast
> Enhancement", and it is now loading all of the aforementioned rasters just
> fine. It's also not using absurd amounts of RAM. I'd humbly suggest making
> this the default.
>
>
>
> >  Did you set the projection of your QGIS project? It sounds like this is
>  set to WGS84/degrees. Try to set it to your british national grid and it
> will probably work fine.
>
> Nope. I'm lazy and used to applications automatically detecting the
> projection of the first layer added and using that for the project (aka
> ArcGIS) ;-) . After some fiddling I found 27700 and it's now correctly
> showing km. But it would be nice if it picked up the projection from the
> first dataset, you can always change it later.
>
>
>
>
> > This is because you probably enabled the "Copyright plugin", which is
>  not enabled by default, I think.
>
> I haven't changed any of the plugins (or indeed, any settings whatsoever),
> they're all on default. I suspected it was for showing your own copyright,
> but couldn't see it in the options page. Even now that I know where it is
> (plugins), there's no obvious way to change the text, only enable/disable it
> via "manage plugins". Not that this is important to me, it's just weird
> having someone else's copyright on my map by default.
>
> Thanks again,
>
> Jonathan
>
>
>
> From:        Andreas Neumann <a.neumann at carto.net>
> To:        <qgis-user at lists.osgeo.org>
> Date:        07/07/2011 14:15
> Subject:        Re: [Qgis-user] Bugs
> Sent by:        qgis-user-bounces at lists.osgeo.org
> ------------------------------
>
>
>
>  Hi Jonathan,
>
> I can only partially answer your questions/remarks.
>
> >  A few bugs with QGIS 1.7.0. Unfortunately there's no obvious way to
> > actually create an account or report bugs on your bug tracker so I'm
> > forced to post them here.
>
> the infrastructure was just changed recently. Did you try on
> http://hub.qgis.org/- personally I don't know how the accounts are
> handled. The old accounts from trac.osgeo.org were migrated.
>
> > 1) I have a ~600MB raster in JP2000 format (*.jp2). QGIS doesn't seem
> > to be able to load this, at least not in a timely manner. It spent at
> > least 5 mins sitting there eating 100% CPU and using quite a bit of
> > RAM.
> > I also have a ~4GB ECW file which similar things happen with. Both
> > files are projected (OSGB - 27700) and I'm fairly sure they have
> > pyramids.
> >
> > MapInfo, ArcGIS, MapModeller (all proprietary), and MapWindow (Open
> > Source) are all capable of displaying both images in fractions of a
> > second.
>
> There has been a lot of mail recently about the problems with ecw.
>
> Personally, I would really stay away from proprietary formats like ecw
> and mrsid. You will never know when those companies changed their
> policies and if they care about compatibility with OS GIS. I personally
> use TIFF files (bigtiff files are more or less unlimited in size), and
> you can choose between different compressions in the tiff, like jpeg,
> deflate, zip, packbits, etc. These files usually work fine. I never had
> any issues. Back 2-3 years I also experimented with ecw and always ran
> into issues with software upgrades.
>
> This doesn't mean that the bug should not be fixed, but it is a
> recommendation about storing your data.
>
> > 2) I load a shapefile that's projected in British National Grid into
> > QGIS. The built in QGIS scale shows "degrees" rather than "metres" as
> > the measurement unit despite showing "0" to "30,000" numerically (so
> > it is showing metres, it's just incorrectly saying "degrees". This is
> > to a new map that has no other layers added.
>
> Did you set the projection of your QGIS project? It sounds like this is
> set to WGS84/degrees. Try to set it to your british national grid and it
> will probably work fine.
>
> > 3) Why is there a "(c) QGIS 2011" in the bottom right of the map
> > viewer? 99% + of other programs use the Help->About page for that.
>
> This is because you probably enabled the "Copyright plugin", which is
> not enabled by default, I think. You can easily disable it in the
> plugins manager. The goal of the copyright plugin is not showing the
> QGIS copyright, but your own copyright (e.g. your company). You can
> easily configure it to show your own copyright, or better disable it
> alltogether. For configuration look into the Plugins toolbar and the
> button with the copyright symbol.
>
> Hope this helps,
> Andreas
>
>
> --
> Andreas Neumann
> Böschacherstrasse 10A
> 8624 Grüt (Gossau ZH)
> Switzerland
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-- 
all the best,
Lee
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