[OSM-newbies] Rivers and Streams

[SomeoneElse]

Dudley Ibbett wrote:
> How to people log streams/rivers and it is reasonable for me to adjust 
> these using the Bing images

Picking a random one near Eskdale here:
http://www.openstreetmap.org/?lat=54.412241&lon=-3.250498&zoom=18&layers=M

the source on that stream is "OS7", so it's come from out-of-copyright 
OS 7th series.  Those maps are the one-inch-one-mile ones that I 
remember from when I was a kid, and to draw anything with any degree of 
accuracy with those is very difficult compared to sources such as GPS 
traces or Bing imagery.  That particular stream was added before Bing 
imagery became available, and there still aren't manu GPS traces there 
so it was as accurate as it could be made at the time.

Basically, if it's wrong, or if you've got a more accurate source (and 
with Bing in this case I'd say that you have) it's perfectly OK to 
change something on the map.  There's lots of heat and even some light 
about the accuracy of various sources in the wiki - people will say that 
an individual GPS trace is rarely accurate to with a few metres 
(correct) and Bing imagery can be offset by varying amounts (also 
correct - have a look at Maderia if you want a good comedy example of 
this).

However, where you've been there and you have GPS traces that back up 
the positioning of the imagery I'd say that it was perfectly OK to 
better align the bits of streams that you can't get to with adjacent 
imagery.  If you go west or southeast from that location you can see way 
55680783 and way 55520962 have GPS traces under them that seem to back 
up the Bing alignment, so I'd say it was OK here.

Cheers,
Andy

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