Hi folks Another query from me that I imagine has been done to death elsewhere (so apologies), but I haven't found it on the wiki. The usual disclaimer that I'm not well up on the technical side of the map.
I've read the wiki on Using Imagery <https://wiki.openstreetmap.org/wiki/Using_Imagery> and have understood that the best way of 'zeroing' the offset of imagery is to look for GPS traces, albeit even they are somewhat inaccurate. A few questions: - Over how wide an area does an offset obtained that way hold good? - Are the old OS maps better/worse/same as this system? Are they an alternative for zeroing imagery? - If I know the grid reference of somewhere (eg, Environment Agency puts a 10-fig reference on a plaque on their assets) is that any help? On the last point, this wiki page <https://wiki.openstreetmap.org/wiki/Key:ele> mentions OSGM02. The link has rotted so I searched their site which gives hits for OSGM15 - Is 02 an outdated standard that I should update on the wiki? Thanks, Edward / eteb3
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