Phil <phil_...@bigpond.com> writes: > I've played with Viking for a week or so and now I'm keen to get hold of > a more recent map for the town than the one available from Open Street > Map. Their map is at least 15 years old. On the other hand, the map from > Google is up to date and correct. > > So my question is; how can I use the Google map? > > I've tried a screen grab and I've also tried scanning a local map but > I'm thoroughly confused by the requirement for eastings and northings. > There must be an easier way to get an accurate map into Viking.
As I understand it, the terms of service for google do not permit it to be used with viking (directly, and they don't permit downloading and saving bits, as I understand it). The notion that OSM's map is 15 years old is odd, as the project is only about 6 years old. It could be that OSM contains data from your local government (or the US census bureau), and that data is 15 years old, but was added to OSM more recently. You could edit OSM to make your town up to date (without copying from proprietary maps, of course). I've done that in my town, including entering trails, so that OSM is now the best map available. As for easting and northing: viking can use "web mercator", which isn't really mercator, but is what google and other webmaps (including osm) use for tiles. It can also use UTM, which is what USGS topo maps tend to be registered in on WMS servers. The package 'proj' can translate. Do you know the datum and projection of your local map? (Many US states have their own state-plane coordinate systems, which are conceptually similar to UTM but different.)
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