[Qgis-user] Scale seems strange in

Wed Nov 2 08:12:02 PDT 2011

If I use the arrow keys to pan north and south the scale changes. If I
use them to pan left and right it doesn't change.

From: kidsmake6until2019 at gmail.com [mailto:kidsmake6until2019 at gmail.com]
On Behalf Of Brad Nesom
Sent: 02 November 2011 15:00
To: James Stott
Cc: Saber Razmjooei; qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Scale seems strange in

I am thinking rather than that it is just the fact that when you use
degrees, moving in the map would give you a different scale.

Because every time you move north or south you have changed the length
of the x distance.

If you pan left and right (very carefully) do you see the scale not
change?

On Wed, Nov 2, 2011 at 9:02 AM, James Stott
<James.Stott at npaconsult.co.uk> wrote:

Could this just be a windows thing then? I tried an older version of
qgis-dev (1.8.0-78) on a different windows machine in the office and
there are no problems. Metres should be the default setting for 27700
shouldn't it not degrees?

James Stott BSc (Hons) MSc | Senior Professional
Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/

James Stott BSc (Hons) MSc | Senior Professional
Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/ 

-----Original Message-----
From: Saber Razmjooei [mailto:razmjooeis at faunalia.co.uk]
Sent: 02 November 2011 10:48
To: James Stott
Cc: qgis-user at lists.osgeo.org
Subject: RE: [Qgis-user] Scale seems strange in

James

I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set
to 27700 and Layer unit to metre.

The scale seems to be fine and not affected by panning.

Cheers
Saber

On Wed, 2011-11-02 at 10:43 +0000, James Stott wrote:
> An update:
>
>
>
> This is also happening on a colleague's machine. I have reverted back
> to the previous OSGeo4W nightly and that doesn't fix the problem.
> Uninstalling and reinstalling doesn't work.
>
>
>
> In 1.7, if I open up this certain dataset of viewpoint locations, it
> opens with a scale of 1:53478. In 1.8 if I load the dataset it opens
> at a scale of 1:5325654358. If I use the pan tool and just click on
> the map the scale changes to 1:631588609, then 1:2918610855, then
> 1:2934133484 and so on. Distance measures seem unaffected. It seems to
> be being caused by the units of the project being set to degrees. I
> have saved a project and the units are set to degrees. If I open an
> old project up it opens at the correct scale. In my old project files
> it is set to metres. (see examples below). It seems I have to make
> sure Enable on the fly projection is unticked in the project
> properties, and then manually set the Layer units to metres in the
> general tab.
>
>
>
> I was also having problems a while ago with exporting to MapInfo but I
> have just tried this and it works. See links below for details. It is
> including the 79 not the 104 now.
>
>
>
>
http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projection
s-epsg-27700-british-national-grid
>
> http://hub.qgis.org/issues/4271
>
>
>
> New project:
>
>
>
> <mapcanvas>
>
>         <units>degrees</units>
>
>         <extent>
>
>             <xmin>384571.226869</xmin>
>
>             <ymin>78401.536498</ymin>
>
>             <xmax>408875.829430</xmax>
>
>             <ymax>92579.221325</ymax>
>
>         </extent>
>
>         <projections>0</projections>
>
>         <destinationsrs>
>
>             <spatialrefsys>
>
>                 <proj4>+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=400000 +y_0=-100000 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs</proj4>
>
>                 <srsid>2437</srsid>
>
>                 <srid>27700</srid>
>
>                 <authid>EPSG:27700</authid>
>
>                 <description>OSGB 1936 / British National
> Grid</description>
>
>                 <projectionacronym>tmerc</projectionacronym>
>
>                 <ellipsoidacronym>airy</ellipsoidacronym>
>
>                 <geographicflag>false</geographicflag>
>
>             </spatialrefsys>
>
>         </destinationsrs>
>
>     </mapcanvas>
>
>
>
> Old project:
>
>
>
> <mapcanvas>
>
>         <units>meters</units>
>
>         <extent>
>
>             <xmin>400790.090563</xmin>
>
>             <ymin>86512.592259</ymin>
>
>             <xmax>401731.465923</xmax>
>
>             <ymax>87217.568425</ymax>
>
>         </extent>
>
>         <projections>0</projections>
>
>         <destinationsrs>
>
>             <spatialrefsys>
>
>                 <proj4>+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=400000 +y_0=-100000 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs</proj4>
>
>                 <srsid>2437</srsid>
>
>                 <srid>27700</srid>
>
>                 <authid>EPSG:27700</authid>
>
>                 <description>OSGB 1936 / British National
> Grid</description>
>
>                 <projectionacronym>tmerc</projectionacronym>
>
>                 <ellipsoidacronym>airy</ellipsoidacronym>
>
>                 <geographicflag>false</geographicflag>
>
>             </spatialrefsys>
>
>         </destinationsrs>
>
>     </mapcanvas>
>
>
>
>
>
>
>
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk <http://www.npaconsult.co.uk/> 
>
>
>
> From: qgis-user-bounces at lists.osgeo.org
> [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of James Stott
> Sent: 01 November 2011 09:15
> To: qgis-user at lists.osgeo.org
> Subject: [Qgis-user] Scale seems strange in
>
>
>
>
> Hi all,
>
>
>
> I am having problems with scales on v1.8 (7297b23) from OSGeo4W.
>
>
>
> If I open an existing project everything is fine.
>
>
>
> If I open data in a fresh QGIS session it is reporting strange scales.
> It doesn't matter what source the data is. For example, I open a
> dataset and it reports 1:784735546. It seems to report correct
> distances. If I pan the scale changes.
>
>
>
> I am using EPSG 27700 (British National Grid).
>
>
>
> Does anyone have any idea what can be causing this?
>
>
>
> James
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk <http://www.npaconsult.co.uk/> 
>
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