[Qgis-user] How to display a scale bar in km on a map in degrees?

[Marco Hugentobler]

Hi Philippe

In the nightly build, it is possible to have a composer scale bar in km 
for maps in degrees. The scalebar however only shows the scale near the 
bottom left of the composer map (the scale is not constant in maps in 
degrees, as others already noted).

Regards,
Marco

Am 16.04.2013 22:01, schrieb Philippe Puig:
>
> I am the poster of this question and I want to thank all those who 
> took the time to answer it.
>
> My problem is not trivial for two reasons:
>
> -I work in the Northern Territory (NT), in Australia. The western part 
> of the NT is in UTM zone 52 and the eastern part in UTM zone 53;
>
> -maps I create often straddle the zone 52/zone 53 boundary and cannot 
> be in m using our standard projections;
>
> -most baseline GIS work in the Northern Territory is carried out by 
> the Government in ArcGIS. ArcGIS allows to display a  scale bar in km 
> on a map in degrees and therefore most map users here expect to have a 
> km scale bar on degrees maps.
>
> I work for a small independent organisation focused on natural 
> resource management.
>
> I decided that our GIS would be entirely based on freeware.
>
> I chose QGIS as our main GIS software.
>
> As I am often expected to emulate ArcGIS, the scale bar issue matters 
> to me.
>
> Now I know that QGIS does not offer the km scale bar  possibility 
> offered by ArcGIS.
>
> I will therefore use a work around  consisting in creating grids of 
> suitable mesh size (eg 100 km) in both UTM 52 and UTM 53.  I will then 
> reproject them in DA94  (the Australian standard degrees CRS) and 
> merge them in GA 94 as a single grid which I will use as a guide to 
> create (approximate) km scale bars in my GDA94 maps.
>
> Philippe
>
>
>
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-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee

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