>(1) Can you think of any depressions in Britain? I.e. places where the
>contour lines on the map would wind the "wrong way"? I ask because I recently
>noticed that the OS OpenData contour data is wrong around Princes Street
>Gardens in Edinburgh. It looks as if the contour lines are in the right
>places but their heights have been mis-labelled, as if the height labels had
>been added automatically by an algorithm that didn't expect depressions. The
>gridded data is consistent with the incorrect labelling, probably confirming
>that the gridded data is derived from the contours, rather than vice-versa.
>The only other depressions that I can think of are the sunken areas in the
>Fens. Any other suggestions?
There are many depressions on a small scale in carboniferous limestone areas,
where rivers/streams have disappeared underground or where caves have
collapsed. I can think of a number but whether there are any that are large
enough to show up in OS data is another question. Take a look here as an
example:
http://www.openstreetmap.org/?lat=53.33172&lon=-1.83588&zoom=15&layers=C
You can see that there are a few strange things happening but the scale is not
really large enough to be clear.
Donald
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