I started cleaning up around the San Francisco area a week ago in preparation for the Where 2.0 conference (Burlingame: May 12th- 14th) and WhereCamp (Mountain View: May 17th - 18th ).
I have found that a lot can be done from a distance using only tiger data and the yahoo photography. So far I have focused work onto the coastline, the airport the freeways and then on Foster <http://openstreetmap.org/?lat=37.5452&lon=-122.2566&zoom=14&layers=0BFT> City (near Burlingame) and the area around the GooglePlex <http://openstreetmap.org/?lat=37.42511&lon=-122.08164&zoom=15&layers=0BFT> . The Freeways need someone with experience because currently the tiger data is single carriageway and it needs to be expanded to dual carriageway. I have found the best way is to first add another carriageway using Potlatch linking the new carriageway into all the entrances and exits along the way and then snip off the last sections of entrances and exits to the far carriageway using JOSM (I don't know how to do that bit in Potlatch). The other area where experience and confidence helps is where there is data that predates the tiger and to decide what to keep and what to delete. In some areas the freeways have already been entered as dual-carriageways so it can make sense to keep them and deleted the tiger data, but in most other situations the tiger data is likely to be better because it will link to all the side roads. Does anyone else feel like joining me? I would suggest that the initial focus is the area to the west of San Francisco Bay between San Francisco itself and Sunnyvale. Just choose a random spot to start and work outwards and let's see how it goes. For anyone who hasn't tried it yet, rectifying Tiger data is more compulsive that Sudoku! Btw, if anyone knows what is going on in the <http://openstreetmap.org/?lat=37.4244&lon=-122.0301&zoom=13&layers=B0FT> bay just north of Mountain View and the Googleplex then please do some suitable tagging. There seem to be loads of shallow ponds with weird colours (particularly weird on google <http://maps.google.co.uk/?ie=UTF8&t=k&ll=37.459735,-122.028065&spn=0.067586 ,0.141964&z=13> aerial photography). I have tagged them as 'natural' and 'water' but I don't think it is really natural and it might not even be water! Regards, Peter Miller
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