[OSM-dev] HTTP OSM Server - index

[Dick]

 <marcus.wolschon <at> googlemail.com> writes:
> What data-structure are you using for the index?
> Are you aware that such indice already exist if usingthe
> OsmBin data-format created via osmosis instead of the xml?
> http://wiki.openstreetmap.org/wiki/OSMbin%28file_format%29

Thanks, I'll take a look at OSMbin as well!

I'm using the following C structures:

struct nodetile {
   int id;
   short int lat;
   short int lon;
};

As a temporary index to lookup to which tile(s) a certain way belongs. As this
index will grow quite large I'm not planning to distribute this file.

Instead I'm planning to publish one of the following indexes:

// for each way, estimated size: 310 MB
struct waytile {
   int id;
   short int minlat;
   short int maxlat;
   short int minlon;
   short int maxlon;
}

or:

// for each tile, average way size * 8 bytes
struct waytile {
   int id;
   short int lat;
   short int lon;
}

And finally two bz2 indexes, for node ids and way ids to a file position:

// estimated size: 300 kB
struct bz2index {
   int id;
   unsigned long long filepos;
};

gr
Dick