[Openstreetmap] How do we handle large amount of GPS points?

Matt Amos matt at matt-amos.uklinux.net
Sun Dec 12 23:50:02 GMT 2004


On Saturday 11 December 2004 10:16, Petter Reinholdtsen wrote:
> [Matt Amos]
>
> > my thinking was that people would upload to a web site, which
> > would validate the file against the schema for gpx, do a number
> > of basic checks on the usability (i.e: lack of noise and fubar'ed
> > points) of the file and then import it to the database.
>
> Another GPX filter I would like is one reading through the file,
> and then add a GPX header with info about the "edges" of the file. 
> This would make it easier to index the files and search out the
> files relevant for a given region.

iirc, gpx provides a "bounds" value in the header for precisely this 
purpose.

> Did anyone have a look at the GPX files I made available?  We
> should probably come up with some naming standard for the files,
> and standardize on what to put in the GPX header.

i don't think a naming standard is necessary, since we can rename the 
files at upload-time to whatever we like.

but we should definately require the author, copyright and description 
headers to be present, as this helps us later if someone claims we 
stole our data from anywhere (a la SCO).

> > but i havent started working on this yet (still getting gpx files
> > out of my SiRF program ;-)), so please have a look later!
>
> Sounds interesting.  I will need to have a look at this soon.  :)
>
> To bad my GPS isn't using the SiRF chipset. :(

writing a program (or modifying gpsd) to output GPX is probably quite 
easy. its even better if you can find a binary mode for your chipset 
so you can get pseudo-range out and post-process it, but this 
probably isnt necessary.

this:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=77360&item=5147970856&rd=1&ssPageName=WD2V
might provide an ideal self-xmas-gift ;-)

steve pointed it out just after i bought a similar one for my 
zaurus. :-(

cya,

matt
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