[Talk-ht] River ways : How to treat Duplicates

[David Groom]

Pierre

These additional ways are not duplicates, as they do not follow the same path as the main river.  If you delete the shorter ways then the islands will "disappear" from the map.

There are two possible methods of mapping these islands.

1) the simple method, which has been used in your example, where the main river is drawn as one way, and the path of the river round an island is drawn as another way.

2) use areas and relations,  here the main "outside of the river" would be drawn as one way, the island would be drawn as another way, and both would be added to a multipolygon relation.

David
 
  ----- Original Message ----- 
  From: Pierre Beland 
  To: talk-ht at openstreetmap.org 
  Sent: Monday, February 22, 2010 2:09 AM
  Subject: [Talk-ht] River ways : How to treat Duplicates




  Before deleting duplicate ways for rivers, I want your advice.

  For Example, Les Trois Rivières, way=49375347 is the main river way. But we also find few ways that trace a second route around islands : 
  ways 48392811, 48392826, 48475427, 48475510, 48475442, 48474646, 48476419, 48474401, 48477201, 48474784, 48475251.  
  Should these segments be considered as duplicates and deleted


  Pierre Beland



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