[OSM-newbies] Mapnik rendering of Beaches

[Richard Moss]

In case anyone was wondering about this, the problem is solved.  With the
combined help of David Earl and Graham Jones, we have found that the coastline
ways for the island are members of relations, which are used as marking
different level administrative boundaries.  One of the relations was also tagged
"natural=land".  It seems that Mapnik renders "natural=land" after
"natural=beach", so overwriting the beaches except in small areas seaward of the
boundary.
 
Looking at the wikihttp://wiki.openstreetmap.org/wiki/Map_Features#Natural , the
use of "natural=land" is deprecated, and is in fact superfluous.  So I have
deleted this tag from the relation, and having made some revisions in the area
to force Mapnik to re-render, the beaches have now appeared :-)
 
Richard  

 


On 02 October 2011 at 18:05 I wrote:


>  Can someone help with advice on rendering of beaches in Mapnik?
> 
 
... 


> 
> The extent of the island was/is defined by the "natural=coastline" way, which
> had been imported from PGS in 2007 and is a fairly crude outline of the
> land-sea interface.
> 
> Being the Med, of course, there is no significant tidal movement in this
> line.  One of Graham's contributions was to indicate where the sandy beaches
> were. He added more-or-less rectangular areas using the "natural=coastline" as
> the seaward edge of the beach, and labelled an area around 30m landside of
> this as "natural=beach".  An example (which I have only edited by adding a
> node where the ferry picked us up) is
> http://www.openstreetmap.org/browse/way/116586186/ .  Before I started
> fiddling, these areas were rendering in Mapnik as good beach-looking yellow
> areas.
> 
> But now they seem to have disappeared. 
> 
 
... 


>   Richard (user: richardm565)
>  
>
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