[OSM-talk] Getting co-ordinates from OSM

[Andy Robinson]

Ben Robbins wrote:
>Sent: 30 November 2006 1:40 AM
>To: talk at openstreetmap.org; richard at systemeD.net
>Subject: Re: [OSM-talk] Getting co-ordinates from OSM
>
>A thourght that I had, and mentioned a bit ago, was that if someone is
>copying from googlemaps, then they will have made a gpx file wich wouldnt
>have any time stamps on it shorely?, cuase they didnt walk around.  Can't
>osm filter out files such as that?

A gpx file without timestamps will fail when imported to OSM, however it's
relatively easy to add false timestamps to a gpx file which allows it to
pass OSM's coarse filter.

We could undertake more analysis of a gpx file to make it less easy for
false timestamps but some sources need to add pseudo timestamps anyway (such
as tracing on the NPE mapping) so it would be difficult to separate out
those that are valid and those that are not.

Probably the best casual method is to look at the gpx headers and if they
seem odd then to ask the uploader more about the origin before the file is
imported. Some gpx files carry software origin information that could be
evaluated. Valid formats could sit on a white list.

Cheers

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk


>
>I say >A<.  need to be blunt.  "You've created a derived work, so we want
>what you've done to be removed or made compatible with CC-BY-SA"
>
>Ben
>
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