[Qgis-user] OnTheFly Reprojections

[Jonathan Moules]

Hi List,
Two issues,

First, I'm noticing that quite a few of the layers we have that are in
British National Grid aren't actually treated that way when I load them
into QGIS. This seems to be because they have a very slightly different
definition than the one QGIS has.
For example:

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000
+ellps=airy +towgs84=375,-111,431,0,0,0,0 +units=m +no_defs

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000
+ellps=airy +towgs84=446.448,-125.157,542.06,0.1502,0.247,0.8421,-20.4894
+units=m +no_defs

QGIS definition
+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000
+ellps=airy +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489
+units=m +no_defs

Three different definitions for the same thing.
This becomes a problem because On The Fly reprojection (which I've now been
forced to disable permanently) is super slow. Even a simple polygon layer
with a few dozen features on top of a WMS creates a very noticeable
(several seconds) lag.

So my question:
Is it possible to make QGIS recognise all the different definitions as one
single definition?

Using a Master build from a couple of months ago.

Thanks,
Jonathan

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