[Imports] [OpenSeaMap-develop] List of Lights, Data Import

Bernhard R. Fischer bf at abenteuerland.at
Wed Jan 12 19:30:56 GMT 2011


On Wednesday 12 January 2011 15:04:29 Malcolm Herring wrote:
> On 12/01/2011 02:36, Steve Singer wrote:
> > Have you considered spatial matching? For each light you want to import
> > check to see if there is already a light within x meters (say 10-20?) if
> > so excluded the light from the import and leave it to be manually
> > inspected?
> 
> Given that LoL positions are only specified to within 0.1', a duplicate
> search radius would have to be more like 300m to take into account
> positional inaccuracies of both. Within such a radius there would often
> be more than one other light, particularly in buoyed channels and on
> pierheads.
> 
> There is also the difficulty of identifying a duplicate. Matching of
> names would likely result in a high error rate. Other features such as
> buoy type or colour may also be problematic. Therefore framing and
> writing matching criteria rules would be a huge task.
> 
> Given that the duplicate problem would be concentrated in areas that are
> actively mapped, it might be easier to identify the mappers and
> circulate a notification and request them to re-visit & edit their
> previous mapped areas.

Yes, everything is exactly like you wrote. But I will work on that post some 
more information about duplicates, problems and hopefully solutions ;)

Regards,
Bernhard
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 490 bytes
Desc: This is a digitally signed message part.
URL: <http://lists.openstreetmap.org/pipermail/imports/attachments/20110112/0dd1ed6a/attachment.pgp>


More information about the Imports mailing list