Hi, I can confirm that in my qgis-master on Ubuntu 11.10 the scale is going crazy with epsg:3763 and others projected CRSs. Seems fine with WGS85.
Cheers -- Giovanni -- On Fri, 2011-11-04 at 09:15 +0000, James Stott wrote: > Thanks for the response and your explanation. It helped to cement what > I already thought. > > > > My point is I think something has gone strange with EPSG 27700 in QGIS > at the moment. It works fine on 1.7.1 and not on the OSGeo4W > 1.8.0-120. It never used to set the units to degrees – it should be > metres. > > > > I think that QGIS is getting the default units wrong for 27700. The > coordinate system definition states that the units should be m. > > > > I am also reporting this behaviour on my windows computer at home > (completely separate to the computers we have the issue on at work) > and a computer using Ubuntu 11.10. And on a windows machine on > (1.8.0-78) it works fine. > > > > I have also noticed a change in the behaviour of Save As... When > exporting to MapInfo MIF. Previously QGIS was getting the export wrong > and using BNG with WGS84, now it is exporting it to BNG with OSGB36 > (which is correct). > > > > > James Stott BSc (Hons) MSc | Senior Professional > Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN > T: 01225 445548 | M: - > www.npaconsult.co.uk > > > > From: [email protected] > [mailto:[email protected]] On Behalf Of Brad Nesom > Sent: 02 November 2011 19:49 > To: James Stott > Cc: Saber Razmjooei; [email protected] > Subject: Re: [Qgis-user] Scale seems strange in > > > > > so did you understand why? > > > lat lon is not an equidistant coordinate system. It is an angular > measure. The graticules merge closer togehter the further north they > go. > > > When you overlay data projected to ll onto a flat surface the lengths > east west at the top are shorter than the lengths east west at the > bottom. > > > that is what is changing the scale because without zooming the scale > of the objects would change by panning the map north and south. > > > Nothng about the scale is changing except the distance measured > across. No coordinate values. > > > HTH > > > > > > > > On Wed, Nov 2, 2011 at 10:12 AM, James Stott > <[email protected]> wrote: > > 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. > > > > > James Stott BSc (Hons) MSc | Senior Professional > Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN > T: 01225 445548 | M: - > www.npaconsult.co.uk > > > From: [email protected] > [mailto:[email protected]] On Behalf Of Brad Nesom > Sent: 02 November 2011 15:00 > To: James Stott > Cc: Saber Razmjooei; [email protected] > 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 > <[email protected]> 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/ > > -----Original Message----- > From: Saber Razmjooei [mailto:[email protected]] > Sent: 02 November 2011 10:48 > To: James Stott > Cc: [email protected] > 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-projections-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 > > > > > > > > From: [email protected] > > [mailto:[email protected]] On Behalf Of James Stott > > Sent: 01 November 2011 09:15 > > To: [email protected] > > 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 > > > > Nicholas Pearson Associates, LogoNicholas Pearson Associates, Latest > > News > > > > > > > > Information and Registered Address > > > > This Electronic Transmission is intended only for the attention of > the > > addressee. It may contain privileged and confidential information. > If > > you are not the person for whom it is intended, you must not copy, > > distribute or take any action in reliance on it. 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If you have received > this electronic transmission in error please notify us immediately by > telephone, delete the transmission and destroy any hard copies. > Nicholas Pearson Associates has used all reasonable efforts to ensure > that this message and any attachments are free from viruses. > Nicholas Pearson Associates, 30 Brock Street, Bath, BA1 2LN , Tel: +44 > (0) 01225 445548, Fax: +44 (0) 01225 312387, Website: > http://www.npaconsult.co.uk/ > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
