I'd be very happy to receive comments on some new mapping I've been doing. West Kilbride in Ayrshire has a piece of parkland/woodland which is of significance to the town. It's difficult or impossible to map much of this from Bing images because of tree cover so I carried out a survey using two GPS devices and repeated trips along the main walkway/paths. The GPS traces give me a good shape of the paths, but there are significant errors in exact path location (obvious from variation in path traces for the same path). Have tried to use the traces, Bing imagery, and the OS opendata info for the stream path. There are errors or misalignment between all the sources of data. The Bing images are out of date, the OS opendata is well out of date, the GPS traces aren't very accurate. Clearly this makes for a bit of a challenge.
My approach has been to do the best I can in order to get this area mapped. There are outstanding questions which need to be answered - does a path actually have this shape - has the stream moved since the OS data was created - how exactly should we deal with the area where a woodland merges into a garden - what's park and what's just grass - and so on. I also know that there are areas I need to revisit to check my information - but this won't be something I'll be doing soon.
So as I say - comments welcome.