Great. Thanks a lot MIke. On Jan 27, 12:50 pm, Mike Williams <[email protected]> wrote: > Be aware that there's a speed restriction of about 4 or 5 GDirections > requests per second. If you were to look up the road distances to 270 > tube stations it's going to take something like 60 seconds. > > What you can do is scan through the list of tube stations looking at the > straight line distances and create a shortlist of the 5 or 10 tubes that > have the nearest straight line distances. Then scan the shortlist for > the one with the shortest driving distance. > > Be aware that people in London never drive to tube stations, because > there's nowhere to park. You may want to use walking distances, so that > the routes are allowed to walk the wrong way through one-way systems (of > which there are very many in London). However, you can't perform a > walking GDirections without a directions panel because Google are > legally required to display the disclaimer which they put at the top of > that panel. > > Also be aware that Google only geocodes UK postcodes to "outcode" > accuracy (due to Royal Mail licensing restrictions). There may be > several tube stations in one postcode "outcode" region. > > Consider an example. Suppose I want to find the nearest tube station > from a point anywhere in the W2 region. In reality the nearest tube > could be Edgeware Road, Bayswater, Queensway, Lancaster Gate, > Paddington, Marble Arch, Notting Hill Gate, Royal Oak or Westbourne > Park, depending on where exactly you are in the W2 region. > > When you geocode "W2 4SS" (which is the postcode of the Queensway tube > station) the geocoder returns the centre of the "W2 3" region, which is > in the middle of Kensington Gardens. The nearest tube station to that > location turns out to be Lancaster Gate. GDirections:walking allows you > to walk through the park, a distance of 0.3 miles. GDirections:driving > knows that you can't drive through the park, so it snaps the starting > location to Bayswater Road and drives you round the one way system via > Lancaster Terrace and Westbourne Street. > > -- > Mike Williams
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