[OSM-dev] Some statistics for file-format -development

[Marcus Wolschon]

Hello everyone,

during the development of my osmbin file-format I ahev gathered some
statistics using an extract of the city of hamburg (a larger extract of all
of the state of baden-wuertemberg is computing right now).

http://wiki.openstreetmap.org/wiki/User:MarcusWolschon/osmbin_draft#statistics

http://spreadsheets.google.com/pub?key=p5alGmffVt6gMsh_x2iXzew

They may be usefull for others doing similar tasks.

It shows the history of:

* how many nodes/ways have now many tags
* how many tag-values have each length (for ways and nodes)
* how many ways have how many nodes referenced
* how many nodes have how many ways referencing them
* ...

I made the linked spreadshet to find the optimum number of slots
for each of these in my fixed-record-length format.


PS:
I could use some help with specifying and implementing the 2D-index
for nodes(location) and ways(bounding-box).