[OSM-newbies] Node placement

[Oliver Maunder]

Hi Thomas

On 4/23/07, Thomas Rynne <thomas.rynne at gmail.com> wrote:
>
> However, from what I have read I now think that I draw nodes manually
> over the top of the GPS traces, using the traces a a guide.
> Is that correct?


You're right - you use the GPS traces as a guide. I think the node placement
can be fairly rough. Often the GPS accuracy is only good to 7 - 10m, which
is about the width of a residential street, so some guesswork will be
involved.

Do I just place the nodes roughly? Is there any special technique?
> Should I cycle along streets in both directions so I can find the middle?


Cycling along the road in both directions will let you average the traces
and should get you closer to the centre - but I think your time would be
better spent cycling along each road once, and getting more streets onto the
map.

How many nodes should I create per road?
> Would a typical straight road consist of two nodes and one segment?


I usually create just enough nodes to follow the shape of the road. You'll
need a node at every junction too. So, if it was a straight road with no
junctions of it, you could get away with two nodes and one segment.


> Also, I took some photos of street names to use the JOSM geo-tag
> feature but can't find any information on how to enable it in JOSM.
> Is there a web page I am missing?


Try this wiki page: http://wiki.openstreetmap.org/index.php/Photo_mapping -
it might have what you need.

Good luck!

Olly
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