[Talk-GB] Lake District Satellite Imagery

[Jason Cunningham]

In the areas of the UK where I use Bing there is the same situation. The
highest zoom level shows an old image. The newer imagery has better detail
than the old in most cases, but you can't be confident that it is better
aligned. In an area I've been working on the old imagery was better
aligned. Things can be complicated because the error within the Bing
imagery can change over a few hundred meters. The same issue applies for
the GPS traces where the error while change over time

Another background source is the OS Opendata Streetview map. I treat this
background as the most reliable 'imagery' source for road alignment. As I
know the Bing imagery is commonly badly misaligned in the areas I map, I'll
shift the Bing imagery to align with the OS Opendata Streetview map. I can
then use my gpx data as another source of data for paths taking note of
errors suggested by the Streetview map, and Bing imagery. When you dealing
with several potential sources all of which can have an alignment error
your forced to make a judgement that will improve with experience.

Jason
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