On 24/03/2011 15:42, Peter Miller wrote:
You make a good point. As far as I am aware the OS now allow derived
works for things drawn on their maps which weren't on the base map. In
the case of rights of way some of them are of course are on the
background OS layer which is a limitation (see example definite map -
link below). As such I don't think we can use the geometry even if we
wanted to.
http://rushmerecommon.files.wordpress.com/2010/06/img_1074.jpg
Also... I am less interested in rights of way than in paths that can
actually be used. There are rights of way around here that are under
water now that the rivers have widened. There are other excellent
paths that are not rights of way.
I think this is an important aspect of OSM, and the use of the
designation tag takes us in this direction. There are huge numbers of
well-used paths on the fringes of urban areas where public usage is more
customary than official. Also in many upland areas there are paths which
have never been marked on OS maps, and with access land now in place,
are never likely to be so marked. The ability to locate these paths in
mist or other bad weather can be a significant aid to safely walking in
the hills.
The usefulness of the definitive statement seems to vary from council to
council. Statements in Nottingham tend to be very detailed containing 10
figure grid references of start and end points, widths, compass
directions, distances and names of roads. On the other hand Windsor and
Maidenhead seems to consist of just links to the Definitive Map
<http://www.rbwm.gov.uk/web/prow_maps.htm>.
Here is a nice example of an impossibly right of way where you would
need waders and a canoe to follow the path!
http://www.streetmap.co.uk/map.srf?X=640205&Y=256605&A=Y&Z=120
<http://www.streetmap.co.uk/map.srf?X=640205&Y=256605&A=Y&Z=120>
The thing that I believe we can lift from the definitive maps with
confidence is fact that it is a 'right of way' and the right of way
code. That was not in the OS base map.
To change subject, this location <http://osm.org/go/0EYGcVU1->
represents some of the hazards of current tagging of tidal waterways
with riverbank (recently discussed elsewhere). I've had to get my feet
wet at high tide even on the path on the S side of the Alde estuary from
Snape heading for Iken around Iken Cliff. Improving tagging for this
sort of thing ultimately relates to achieving decent mapping of
practicability of paths.
There also exist PRoW where you can be actively discouraged from
walking: for instance the bridleway N
<http://www.bing.com/maps/?v=2&cp=52.51674306015763%7E0.2686755359173221&lvl=15&dir=0&sty=s&eo=0&where1=Welney%2C%20Norfolk&q=welney&FORM=LMLTCC>
from Wash Road on the left bank embankment of the New Bedford River at
Welney. This overlooks the WWT reserve and people silouhetted on the
skyline can cause considerable disturbance to the wildfowl. As a very
naive birdwatcher I didn't know this, until I got a flea in my ear from
a warden driving a tractor (which does not spook the birds).
Jerry
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