[Talk-GB] non-squared buildings

[David Woolley]

On 30/09/2019 11:47, SK53 wrote:
> I imagine for accurately surveyed & designed buildings JOSM's algorithm 
> is likely to introduce additional errors because the 
> architects/engineers will have used British Grid.

Squaring to the grid is something you could only reasonably do for 
buildings oriented to one of North, South, East or West.  Given that, if 
spherical geometry has a significant effect, you are going to have to do 
more complex calculations, I imagine things will be done in the way that 
is easiest to implement with theodolites, etc., not one that produced 
round grid references.