[OSM-dev] OSM History Retriever

[Brett Henderson]

On Wed, Jul 21, 2010 at 11:52 PM, Lars Francke <lars.francke at gmail.com>wrote:

> On Wed, Jul 21, 2010 at 15:42, Brett Henderson <brett at bretth.com> wrote:
> > I haven't looked at the full history dump to be honest so I'm not in a
> great
> > position to comment, but I'll comment anyway ;-)
> >
> > I'm curious what the format of the full history dump is.  I'd like to
> > understand how nodes, ways and relations are represented in the file but
> I
> > can't do so without downloading the whole thing and decompressing it.
>
> The format is pretty standard .osm XML.
> It currently outputs a visible attribute for every object.
>
> Apart from that everything should be standard[1] and modeled after the
> tool that writes the planet except that each element may occur
> multiple times.
> There are only two things to look out for: It is not "pretty-printed",
> so everything is just one huge line (I know that some people do
> line-based parsing but that won't work here) and as there's old data
> mixed in not every element has uid and user attributes.
>
> Let me know if you have any questions or if a format change would help
> in any way but I believe the current format is pretty normal and
> should be parseable by almost every tool that already parses .osm
> files.
>

That format is fine and exactly what I would have expected.  I suspect
Osmosis would parse it okay, but without support for the visible attribute
it won't be particularly useful.


>
> Cheers,
> Lars
>
> [1]
> https://bitbucket.org/lfrancke/historydump/src/tip/src/main/java/org/openstreetmap/util/Dumper.java
>
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