[Qgis-user] Custom Projection for EPSG 27700 when opening shp and TAB files from other software

[Zirneklitis]

Datums are slightly different.

James Stott wrote:
> ..
> The definition of a layer in QGIS using OSGB 1936 / British National
> Grid (27700) is:
>
> ..  +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 ..
>
> ..
> below which seems to match the EPSG 27700 definition but does not get
> recognised as 27700:
>
> ..
> .. +towgs84=446.448,-125.157,542.06,0.1502,0.247,0.8421,-20.4894 ..
>
>..