I am mapping in Central London (where I live) and have noticed a very large number of inaccuracies. I have been trying to fix these. However it is clear that nothing short of moving almost every building and road to make their position more accurate will do. I would go into more detail but I just wrote up It is clear that all outlines of roads, buildings, etc have come from some imagery not available in the editors, and not aligned with OS's data. The GPS traces in the area are absolutely diabolical, ruling that out as a detailed question which subsequently was eaten by this forum! source. My plan is to use OS's Open Data to get road and building-block outlines to match up with OS. As it stands, almost nothing where I'm mapping matches up with this data, but the data itself is very much *not* consistent with 'real-life' nor even with itself. It seems the most sensible option to me to use OS to do this. But are there any thoughts, critiques, or problems that should be pointed out before I undertake this task? To clarify, I don't think I will be stepping on anyone's toes by moving buildings around slightly. I have already added so much data in my area that it is almost entirely my own work... except for the overall building outlines and road paths, which are inaccurate!

I am mapping in Central London (where I live) and have noticed a very large number of inaccuracies. I have been trying to fix these. However it is clear that nothing short of moving almost every building and road to make their position more accurate will do. I would go into more detail but I just wrote up a detailed question which subsequently was eaten by this forum! My plan is to use OS's Open Data to get road and building-block outlines to match up with OS. As it stands, almost nothing where I'm mapping matches up with this data, but the data itself is very much *not* consistent with 'real-life' nor even with itself. It seems the most sensible option to me to use OS to do this. But are there any thoughts, critiques, or problems that should be pointed out before I undertake this task? To clarify, I don't think I will be stepping on anyone's toes by moving buildings around slightly. I have already added so much data in my area that it is almost entirely my own work... except for the overall building outlines and road paths, which are inaccurate!