[Talk-transit] totally abandoned rails

[Cartinus]

On Saturday 31 July 2010 20:58:59 Heiko Jacobs wrote:
> Heiko Jacobs schrieb:
>  > ...
>  > Sometimes the "traces" of a railway are very "virtual":
>  > ...
>  > Sometimes no trace exist anymore
>  > ...
>
> For this I'm searching a word ...

If you don't map it, then you don't need the word -> that is why you don't get 
much support from other people finding it.


On Saturday 31 July 2010 20:58:59 Heiko Jacobs wrote:
> Cartinus schrieb:
>  > You don't have to dig. Medieval maps are certainly out of copyright.
>
> ... and out of coordinates ...
> surveying with suitable precision started long time after medieval ...

How are you going to find accurate coordinates for something that is no longer 
there like your railway? What you described previously were approximations 
based on other things.

How accurate is tracing lakes from landsat images?

How accurate is the PGS data most coastlines in OSM are based on?

How accurate is a GPS on a wooded mountain trail or in a typical city centre?

Look up "map warping" with your favourite search engine to see what people are 
doing with historical maps and known points.


OSM is full of inaccurate data.

-- 
m.v.g.,
Cartinus