On Nov 18, 3:31 pm, goFishy <[email protected]> wrote: > Hi all, > > I'm looking to create an isochronous map for a catchment area of 2 > hours or less. I've found an application that will do that, however it > uses polygons that include areas covered by the sea and as far as I > know, people can't drive over water.
I can't get Cartoo to do that, and I live almost on the beach. The only time the polygon includes water is to show how far you get on car- ferry journeys. If more than one ferry is available, then the polygon boundary joins the ends of the "spokes". That's what should happen -- a similar thing happens on land, where the polygon can include areas with no roads. If the application coloured the routes within the isochrone, rather than join points on the boundary, you would get a better analysis, including holes where there's a fast ring-road for example. But calculating that would be very slow; currently there is a trade-off between speed and complete accuracy. If you weren't worried about speed, I suppose it would be possible to use similar code to Cartoo and flood the map with polylines, maybe sending all the data back server-side to build tiles to overlay. Andrew -- You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=.
