[Qgis-user] [Qgis-developer] Projection of ESPG/ESRI

[Alex Mandel]

On 11/27/2013 11:18 AM, Randal Hale wrote:
> Awesome - OK - I didn't know project on the fly would assign a
> projection. I usually leave it off - All the data needs to be in one
> projection anyway.
> 

No it's not that it assigns a projection, it's that it ignores the
projection and just operates on pure coordinates. So if you bring 2
things in that are different projections (ie a UTM layer and an unknown)
then unless they are actually the same projection they won't line up at
all.

If you were to turn projection on the fly on, then the auto guess
incorrect WGS84 would do way screwy stuff even if both layers were the
same projection.


So basically, load up your unknown layer. Then load a known reference
layer. If it matches you have a winner, if it doesn't drop it and try a
different reference layer (different projection), and so on till you
find the match.

Enjoy,
Alex