[OSM-newbies] Tracing from NPE maps

[Chris Fleming]

Richard Fairhurst wrote:
> Gervase Markham wrote:
>   
>> Is tracing directly from the NPE maps, with no or very little GPS fix
>> support, considered reasonable? Or are they not considered accurate  
>> enough?
>>     
>
> The main problem with the NPE maps is alignment. The best way to  
> solve this is to align one end of the road you want to trace with a  
> GPS track - at a junction, maybe - so you know by how much to offset  
> your tracing.
>
> I've recently started work on rerectifying the maps so there's less  
> distortion, but this will take a while
When I've done this I've added a source=NPE  tag, this way if someone 
comes along with a trace and finds that it's out from yours they know 
when the error is from.

Cheers
Chris

-- 
http://www.chrisfleming.org/