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<div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for the response and your explanation. It helped to cement what I already thought.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I think that QGIS is getting the default units wrong for 27700. The coordinate system definition states that the units should be m.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></P><P STYLE=" margin-top:5px; margin-bottom: 10px">
<SPAN STYLE="font-family: 'Verdana','sans-serif'; color: #00227c; font-size: 10pt">
<STRONG>James Stott</STRONG>
<SPAN STYLE="font-size: 8pt">BSc (Hons) MSc</SPAN> |
Senior Professional<BR>
<SPAN STYLE="font-size: 8pt"><B STYLE="font-weight: bold">Nicholas Pearson Associates </B> | 30 Brock Street | Bath | BA1 2LN<BR>
<B>T:</B>
01225 445548
| <B>M:</B>
-<BR>
<A HREF="http://www.npaconsult.co.uk/" STYLE="font-family: 'Verdana','sans-serif'; color: #00227c; font-size: 8pt; text-decoration: none;"><STRONG>www.npaconsult.co.uk</STRONG></A>
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<div class=WordSection1><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> kidsmake6until2019@gmail.com [mailto:kidsmake6until2019@gmail.com] <b>On Behalf Of </b>Brad Nesom<br><b>Sent:</b> 02 November 2011 19:49<br><b>To:</b> James Stott<br><b>Cc:</b> Saber Razmjooei; qgis-user@lists.osgeo.org<br><b>Subject:</b> Re: [Qgis-user] Scale seems strange in<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>so did you understand why?<o:p></o:p></p></div><div><p class=MsoNormal>lat lon is not an equidistant coordinate system. It is an angular measure. The graticules merge closer togehter the further north they go.<o:p></o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal>that is what is changing the scale because without zooming the scale of the objects would change by panning the map north and south.<o:p></o:p></p></div><div><p class=MsoNormal>Nothng about the scale is changing except the distance measured across. No coordinate values.<o:p></o:p></p></div><div><p class=MsoNormal>HTH<o:p></o:p></p></div><div><p class=MsoNormal><br><br> <o:p></o:p></p></div><div><p class=MsoNormal>On Wed, Nov 2, 2011 at 10:12 AM, James Stott <<a href="mailto:James.Stott@npaconsult.co.uk">James.Stott@npaconsult.co.uk</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>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.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p></div><div><p style='mso-margin-top-alt:3.75pt;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm'><strong><span style='font-size:10.0pt;color:#00227C'>James Stott</span></strong><span style='font-size:10.0pt;color:#00227C'> </span><span style='font-size:8.0pt;color:#00227C'>BSc (Hons) MSc</span><span style='font-size:10.0pt;color:#00227C'> | Senior Professional<br></span><b><span style='font-size:8.0pt;color:#00227C'>Nicholas Pearson Associates </span></b><span style='font-size:8.0pt;color:#00227C'>| 30 Brock Street | Bath | BA1 2LN<br><b>T:</b> 01225 445548 | <b>M:</b> -<br><a href="http://www.npaconsult.co.uk/" target="_blank"><strong><span style='color:#00227C;text-decoration:none'>www.npaconsult.co.uk</span></strong></a> </span><o:p></o:p></p></div><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:10.0pt'>From:</span></b><span lang=EN-US style='font-size:10.0pt'> <a href="mailto:kidsmake6until2019@gmail.com" target="_blank">kidsmake6until2019@gmail.com</a> [mailto:<a href="mailto:kidsmake6until2019@gmail.com" target="_blank">kidsmake6until2019@gmail.com</a>] <b>On Behalf Of </b>Brad Nesom<br><b>Sent:</b> 02 November 2011 15:00<br><b>To:</b> James Stott<br><b>Cc:</b> Saber Razmjooei; <a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a><br><b>Subject:</b> Re: [Qgis-user] Scale seems strange in</span><o:p></o:p></p></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Because every time you move north or south you have changed the length of the x distance.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>If you pan left and right (very carefully) do you see the scale not change?<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br><br> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Wed, Nov 2, 2011 at 9:02 AM, James Stott <<a href="mailto:James.Stott@npaconsult.co.uk" target="_blank">James.Stott@npaconsult.co.uk</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>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?<br><br><br>James Stott BSc (Hons) MSc | Senior Professional<br>Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN<br>T: 01225 445548 | M: -<br><a href="http://www.npaconsult.co.uk/" target="_blank">http://www.npaconsult.co.uk/</a><br><br>-----Original Message-----<br>From: Saber Razmjooei [mailto:<a href="mailto:razmjooeis@faunalia.co.uk" target="_blank">razmjooeis@faunalia.co.uk</a>]<br>Sent: 02 November 2011 10:48<br>To: James Stott<br>Cc: <a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a><br>Subject: RE: [Qgis-user] Scale seems strange in<br><br>James<br><br>I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set<br>to 27700 and Layer unit to metre.<br><br>The scale seems to be fine and not affected by panning.<br><br>Cheers<br>Saber<br><br>On Wed, 2011-11-02 at 10:43 +0000, James Stott wrote:<br>> An update:<br>><br>><br>><br>> This is also happening on a colleague’s machine. I have reverted back<br>> to the previous OSGeo4W nightly and that doesn’t fix the problem.<br>> Uninstalling and reinstalling doesn’t work.<br>><br>><br>><br>> In 1.7, if I open up this certain dataset of viewpoint locations, it<br>> opens with a scale of 1:53478. In 1.8 if I load the dataset it opens<br>> at a scale of 1:5325654358. If I use the pan tool and just click on<br>> the map the scale changes to 1:631588609, then 1:2918610855, then<br>> 1:2934133484 and so on. Distance measures seem unaffected. It seems to<br>> be being caused by the units of the project being set to degrees. I<br>> have saved a project and the units are set to degrees. If I open an<br>> old project up it opens at the correct scale. In my old project files<br>> it is set to metres. (see examples below). It seems I have to make<br>> sure Enable on the fly projection is unticked in the project<br>> properties, and then manually set the Layer units to metres in the<br>> general tab.<br>><br>><br>><br>> I was also having problems a while ago with exporting to MapInfo but I<br>> have just tried this and it works. See links below for details. It is<br>> including the 79 not the 104 now.<br>><br>><br>><br>> <a href="http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projections-epsg-27700-british-national-grid" target="_blank">http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projections-epsg-27700-british-national-grid</a><br>><br>> <a href="http://hub.qgis.org/issues/4271" target="_blank">http://hub.qgis.org/issues/4271</a><br>><br>><br>><br>> New project:<br>><br>><br>><br>> <mapcanvas><br>><br>> <units>degrees</units><br>><br>> <extent><br>><br>> <xmin>384571.226869</xmin><br>><br>> <ymin>78401.536498</ymin><br>><br>> <xmax>408875.829430</xmax><br>><br>> <ymax>92579.221325</ymax><br>><br>> </extent><br>><br>> <projections>0</projections><br>><br>> <destinationsrs><br>><br>> <spatialrefsys><br>><br>> <proj4>+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717<br>> +x_0=400000 +y_0=-100000 +ellps=airy<br>> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m<br>> +no_defs</proj4><br>><br>> <srsid>2437</srsid><br>><br>> <srid>27700</srid><br>><br>> <authid>EPSG:27700</authid><br>><br>> <description>OSGB 1936 / British National<br>> Grid</description><br>><br>> <projectionacronym>tmerc</projectionacronym><br>><br>> <ellipsoidacronym>airy</ellipsoidacronym><br>><br>> <geographicflag>false</geographicflag><br>><br>> </spatialrefsys><br>><br>> </destinationsrs><br>><br>> </mapcanvas><br>><br>><br>><br>> Old project:<br>><br>><br>><br>> <mapcanvas><br>><br>> <units>meters</units><br>><br>> <extent><br>><br>> <xmin>400790.090563</xmin><br>><br>> <ymin>86512.592259</ymin><br>><br>> <xmax>401731.465923</xmax><br>><br>> <ymax>87217.568425</ymax><br>><br>> </extent><br>><br>> <projections>0</projections><br>><br>> <destinationsrs><br>><br>> <spatialrefsys><br>><br>> <proj4>+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717<br>> +x_0=400000 +y_0=-100000 +ellps=airy<br>> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m<br>> +no_defs</proj4><br>><br>> <srsid>2437</srsid><br>><br>> <srid>27700</srid><br>><br>> <authid>EPSG:27700</authid><br>><br>> <description>OSGB 1936 / British National<br>> Grid</description><br>><br>> <projectionacronym>tmerc</projectionacronym><br>><br>> <ellipsoidacronym>airy</ellipsoidacronym><br>><br>> <geographicflag>false</geographicflag><br>><br>> </spatialrefsys><br>><br>> </destinationsrs><br>><br>> </mapcanvas><br>><br>><br>><br>><br>><br>><br>><br>><br>> James Stott BSc (Hons) MSc | Senior Professional<br>> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN<br>> T: 01225 445548 | M: -<br>> <a href="http://www.npaconsult.co.uk/" target="_blank">www.npaconsult.co.uk</a><br>><br>><br>><br>> From: <a href="mailto:qgis-user-bounces@lists.osgeo.org" target="_blank">qgis-user-bounces@lists.osgeo.org</a><br>> [mailto:<a href="mailto:qgis-user-bounces@lists.osgeo.org" target="_blank">qgis-user-bounces@lists.osgeo.org</a>] On Behalf Of James Stott<br>> Sent: 01 November 2011 09:15<br>> To: <a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a><br>> Subject: [Qgis-user] Scale seems strange in<br>><br>><br>><br>><br>> Hi all,<br>><br>><br>><br>> I am having problems with scales on v1.8 (7297b23) from OSGeo4W.<br>><br>><br>><br>> If I open an existing project everything is fine.<br>><br>><br>><br>> If I open data in a fresh QGIS session it is reporting strange scales.<br>> It doesn’t matter what source the data is. For example, I open a<br>> dataset and it reports 1:784735546. It seems to report correct<br>> distances. If I pan the scale changes.<br>><br>><br>><br>> I am using EPSG 27700 (British National Grid).<br>><br>><br>><br>> Does anyone have any idea what can be causing this?<br>><br>><br>><br>> James<br>><br>> James Stott BSc (Hons) MSc | Senior Professional<br>> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN<br>> T: 01225 445548 | M: -<br>> <a href="http://www.npaconsult.co.uk/" target="_blank">www.npaconsult.co.uk</a><br>><br>> Nicholas Pearson Associates, LogoNicholas Pearson Associates, Latest<br>> News<br>><br>><br>><br>> Information and Registered Address<br>><br>> This Electronic Transmission is intended only for the attention of the<br>> addressee. It may contain privileged and confidential information. If<br>> you are not the person for whom it is intended, you must not copy,<br>> distribute or take any action in reliance on it. If you have received<br>> this electronic transmission in error please notify us immediately by<br>> telephone, delete the transmission and destroy any hard copies.<br>><br>> Nicholas Pearson Associates has used all reasonable efforts to ensure<br>> that this message and any attachments are free from viruses.<br>><br>> Nicholas Pearson Associates, 30 Brock Street, Bath, BA1 2LN , Tel: +44<br>> (0) 01225 445548, Fax: +44 (0) 01225 312387, Website:<br>> <a href="http://www.npaconsult.co.uk/" target="_blank">http://www.npaconsult.co.uk</a><br>><br>><br>> _______________________________________________<br>> Qgis-user mailing list<br>> <a href="mailto:Qgis-user@lists.osgeo.org" target="_blank">Qgis-user@lists.osgeo.org</a><br>> <a href="http://lists.osgeo.org/mailman/listinfo/qgis-user" target="_blank">http://lists.osgeo.org/mailman/listinfo/qgis-user</a><br><br><br><br><a href="http://www.npaconsult.co.uk/http:/www.npaconsult.co.uk/about-news.asp" target="_blank">http://www.npaconsult.co.uk/http://www.npaconsult.co.uk/about-news.asp</a><br><a href="http://www.npaconsult.co.uk/terms.asp" target="_blank">http://www.npaconsult.co.uk/terms.asp</a><br>This Electronic Transmission is intended only for the attention of the addressee. 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