[Qgis-developer] Distance calculation accuracy ?

[Richard Duivenvoorde]

On 26-10-15 08:48, kimaidou wrote:
> Hi all
> 
> Someone reported to me an issue with $length distance calculation and
> the "Distance" map tool. It seems to him QGIS was not precise enough
> compared to field data collection (about 10% or worst discrepency)
> 
> I remember reading some discussions here about wrong distance
> calculations in some contexts.
> Has anyone a "cookbook" or good practices about distance calculations in
> QGIS, regarding different data sources, contexts, SCR, etc. ( on the fly
> reprojection or not, data provider, etc.)

I know Nyall has been busy with this (see hist posts in both dev and
user list).

Regards,

Richard