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I have created a custom reprojection to reproject from ETRS89 to London Survey Grid. However this currently only takes care of the x y coordinates. I would like to create a grd file of the ellipsoid to orthometric height adjustments. I have created a grid of points with the height adjustment values but don't know how to get that into a format that CSMapReprojector can use. Alternatively, does someone already have a grd file for ETRS89 to OSGB?

Hi Helen - @rhartley has an approach to go from LSG to BNG and vice versa, with his permission I'd be happy to pass it on, or at least facilitate an introduction.

OK, thanks @1spatialdave, that sounds useful :)

p.s. I need the workflow to work on point clouds.

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