On 03/04/11 14:19, Stuart Grimshaw wrote:
On Sat, Apr 2, 2011 at 4:37 PM, Jerry Clough : SK53 on OSM
<[email protected]> wrote:
a) Do not import any NaPTAN data in areas where imports have already taken
place. Experience shows that detailed survey& correction of NaPTAN data is
not to be undertaken lightly. IIRC about 10% is wrong. The best data are for
Hullwhere Chris Hill surveyed the lot. I have done only about 20% of
Nottingham's NaPTAN stops and have a similar error rate. Unfortunately
processing NaPTAN alongside primary surveying just didnt prove viable, but
there are plenty of stops which no longer exist, have moved or dont exist on
the ground.
b) Check with any mappers in the area before performing an import. There may
be good reasons why they have not requested one in the past.
c) The best approach would be to host current NaPTAN data in a location
where OSM data can be compared& then mappers could choose to import it.
Having an application which did this would be way more useful than
shoehorning NaPTAN data in on its own.
I think this is a great idea Jerry, an app for people to compare what
OSM holds already against what's in the latest version of NAPTAN, the
data we were looking at was a few days old.
What's the maximum area or number of points a tool like this would
normally import? You don't want someone just selecting the whole of
the UK& then importing them.
I much prefer Andy's idea of an editor overlay. Then no data is directly
imported into OSM, but data can be selectively compared and copied from
a data layer to use stops and other features, such as stop areas, where
someone is interested.
Surveying the whole of a city, even a smallish one having about 1300
stops, to verify its NaPTAN import was a ridiculously large task, being
able to copy a much smaller area would have made much more sense. That
way someone could copy the stops for a bus route or around a
neighbourhood and work on those and it would be easier to manage for
multiple people working in one area.
--
Cheers, Chris
user: chillly
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