[Qgis-user] Map Units in Map Composer

[Marco Hugentobler]

Hi Gerhardus

 >I have specified the scale bar in the map composer to have the 
following values:

 >Segment Size: 0.01

 >Map units per  bar unit: 0.01


If you want the segment size to equal 100m in the related map, you could 
set segment size to 100.
The setting 'map units per bar unit' is if you want to label the scale 
bar with a different unit (e.g. set it to 1000 if you have a meter map 
and want to label the bar in km).

Regards,
Marco

On 08.03.2012 16:12, Gerhardus Geldenhuis wrote:
> Hi
> I am a bit confused about the map units referred to in the settings 
> for the scale bar in the map composer.
>
> On my original field slips I drew the UTM co-ordinates and in a 
> temporary shape layer I have drawn points to correspond to the UTM 
> co-ordinates. The field slips are tiff images that I have 
> georeferenced. I have checked and my project is set to be in UTM:
>
> +proj=utm +zone=35 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs 
> +towgs84=0,0,0
>
>
> I have specified the scale bar in the map composer to have the 
> following values:
>
> Segment Size: 0.01
>
> Map units per  bar unit: 0.01
>
>
> So the first bit of confusion is about the segment size(map units) as 
> I would expect that to be meters, so Segment size should have been 100m...
>
>
> Secondly and more importantly, the scale bar does not match up with my 
> temporary shape layer. With the current settings the scale bar should 
> be roughly a km but it is slightly longer than that. I fairly sure I 
> am missing something and would appreciate anyone being able to shed 
> light on these scaling issues.
>
>
> Regards
>
>
> -- 
> Gerhardus Geldenhuis
>
>
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-- 
Dr. Marco Hugentobler
Sourcepole -  Linux&  Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee

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