On 16/10/10 10:01 AM, Richard Weait wrote:
I'd also double check that there aren't privacy concerns - gpx traces
contain time information - is your company happy releasing that? Would
it compromise them? Do the drivers get a say?
Good point. If privacy or business practices are a concern, you might
munge the timestamps a bit. IIRC, OSM requires timestamps and will
ignore files without them. Also IIRC you can use gpsbabel to set the
timestamps in your file to one second gaps beginning at unix epoch, so
that would give your vehicles outrageous speeds during 1970.
Also you can choose the privacy settings for your traces to prevent
sharing the timestamps.
http://wiki.openstreetmap.org/wiki/Visibility_of_GPS_traces
Yeah, I'd thought about this. I've been playing with gpsbabel, and
figuring out the whole workflow, including timestamp munging. I was
going to upload as 'private' tracks; are there any drawbacks to doing so?
We've got, it looks like, the last three months or so of tracks from
about twenty vehicles, and I can break the data up into whatever chunks
I want. I've been working with one track file per seven days, which
seems to be about a 6-8MB gpx file. Would this be okay to upload? Is
there any issue with it containing only one track (i.e. there are some
connections between points that are hundreds of kilometers apart).
As for the drivers: they know the vehicles movements are being logged,
and they know that I'm working on making their maps better; there
wouldn't be any problem with getting their permission, but I'm not sure
it's necessary -- there's no way to link any part of the logging to any
particular vehicle, or driver. Hmm... there will be a concentration of
points near drivers' homes... but then again, also near every place they
stop as well. Is this something to worry about?
I should have an official sign-off on the uploading sometime this week.
- Sam.
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