Separate lines, polygons and points

Question

I have managed to extract some highway types out of an .osm file and when I display it in Quantum GIS it splits it into lines, points and polygons. Being roads I only need lines, but with points checked, I get thousands of points across the map.

I have had a look and Quantum GIS reads type=polygon or type=line etc. Is there anyway to only include type=line when extracting data through osmosis?

Answer 1

2

I'm not an osmosis expert but checking quickly the detailed usage on the wiki says that you can filter ways on a tag list ("--tag-filter") with the option 'accept-ways'.

Example from the wiki:

osmosis \
  --read-xml input.osm \
  --tf accept-ways highway=* \ 
  --tf reject-ways highway=motorway,motorway_link \
  --tf reject-relations \
  --used-node \
  --write-xml output.osm

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answered 20 Jun '12, 12:49

Pieren
9.8k●20●83●157
accept rate: 15%

have tried adding --tf reject-ways type=point,polygon to my script but it makes no difference

(20 Jun '12, 13:26) stuart576

2

Right I have solved this, after reading up on nodes and ways.

"...a node will normally have at least one tag to define it's purpose or be part of a Relation and may have multiple tags."

From this I realised that the points were only relations to highway tags. So I added "--tf reject-relations" and voila!

Thanks for the guidance Pieren.

(20 Jun '12, 13:35) stuart576

@stuart576, I'm having trouble with this. Can you update with the complete solution that worked for you?

(07 Oct '15, 02:25) mkirk

Separate lines, polygons and points

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