[Qgis-user] Projections

[Hernán De Angelis]

Mike


For measuring the kind of distances you are mentioning I would suggest 
using ellipsoidal (geodetic) distances rather than projected distances. 
This is because projected distances can become very inaccurate over 
large regions (depending on the particular projection of course).


If measuring areas is important consider an equal area projection, like 
Albers for example, not a conformal one like Lambert.


Hope this helps.


/H.




On 2020-10-22 07:43, MIKE MCGRADY wrote:
> I have data on tracked migratory birds, and want accurate measures of 
> distance travelled during migration and areas of summering and 
> wintering ranges.  These birds are summering in central Asia (mostly 
> Kazakhstan and southern Russia), and wintering in Arabia.  Any advice 
> on which projection to use?  My guess is Lambert conformal conic.  I'd 
> really like to avoid using different projections for different phases 
> of the birds' annual cycle, unless absolutely necessary.
>
> M. J. McGrady
> Am Rosenhugel 59
> A-3500 Krems
> Austria
>
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