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.
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