[OSM-talk] city accuracy

[Franc Carter]

I have had a look at a few places in Sydney on Yahoo Imagery with josm and
parts of it
are out by a fair bit - roads go at inconsistent angles which is the
giveaway. Obviously
getting good traces in amongst all those tall buildings is pretty unlikely.

So, one idea that springs to mind is to start with a set of good traces just
outside the
city, align the imagery to that and then work my way in to the city aligning
the new
images to the ones already downloaded and so on.

However, this will only work if the distortion on the Yahoo Imagery changes
slowly,
and I don't know if it does . . .

So, does this seem reasonable and does anybody have a better way of getting
some known good points to work from ?

cheers

-- 
Franc
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