[OSM-talk] conclusions from my postgres / postgis experiments

[raphael Jacquot]

Richard Fairhurst wrote:
> raphael Jacquot <sxpert at sxpert.org> wrote:
> 
>> segments A-B, B-D, B-I, D-F  are on the same street, your routing  
>> algorithm needs to have access to those segments as separate ways
>> however, prior to doing the routing, you need to search for that  
>> street's name. it's simpler if you have to look up only one record  
>> for that street, even if it's composed of multiple segments.
> 
> Agreed absolutely, but I don't see why the core OSM db has to be  
> structured around this.
> 
> When you use an in-car "satnav", or the route-planners on Google,  
> www.theaa.com, or www.rac.co.uk (or your local equivalents), they're  
> not working off the raw Ordnance Survey MasterMap database. They're  
> using a heavily processed version of it.

all those people use a standard format to 'share' their data, GDF 
(Geographic Data File), which was specified by the CEN technical 
committee 278 Road Transport and Traffic Telematics which defines such a 
structure.

see :

http://www.ertico.com/en/links/links/gdf_-_geographic_data_files.htm