[OSM-newbies] Help -- How to use waterway=riverbank

[David Groom]

  From: Charlotte Wolter 
  To: newbies at openstreetmap.org 
  Sent: Monday, September 06, 2010 7:00 PM
  Subject: [OSM-newbies] Help -- How to use waterway=riverbank


  Hello everyone,

          I've been mapping the Little Colorado River, which, despite its name, is rather large, bank to bank. When it's not encased in a canyon--such as when it gets close to joining the big Colorado--it's a typical Western U.S. river: a quarter-mile wide and a foot deep. So, in the places where it is wide, I've been mapping it as two riverbanks. However, it sometimes renders as a large area of water,  covering places that are not under water.
          I know we are not supposed to map for rendering, but this result makes me think that I am doing something wrong. 
          So, what is the correct way to handle waterway=riverbank?  Do we join the two banks from time to time (as I have done to try to correct the problem)? 
          The area I have mapped is in northern Arizona, around the towns of Cameron and Winslow.
          Thanks in advance for your help.

  Charlotte Wolter


  Charlotte Wolter
  927 18th Street Suite A
  Santa Monica, California
  90403
  +1-310-597-4040
  techlady at techlady.com






Charlotte Just looking at http://www.openstreetmap.org/edit?lat=35.87738&lon=-111.4111&zoom=17 .

To summarise the points which have been made already, and to add some of my own. 

Lets take, as an example,  the bit of the river to the east of the bridge in Cameron. This is currently made up of 4 ways (two long ways of the real riverbank, and 2 which cross the river) . 

You should either: 
a) make all 4 ways into one way forming a closed area; 
or b) add all 4 ways to a relation, each way with the role "outer" and tag the relation with "type=multipolygon","waterway=riverbank", "name=Little Colorado River". 

In addition, ideally, there should also be a central way drawn in the direction of the river flow, and tagged as "waterway=river" 

Also where the river crosses under the bridge, the western part ,and the eastern part should share the same small section of way, so that the two areas butt up against each other rather than having the short section of waterway=river between them( unless the river really does narrow at that point). 

David 


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