[mkgmap-dev] multipolygon wih leisure=park does not render

Sat Sep 11 04:44:59 BST 2010

Hi WanMil,

A question on boundary tags?

I have lately been using the great maps from openmtbmap.org and the national
parks that don't need a multipolygon appear, but the national parks that do
need a multipolygon don't appear. I assume this is because of the
boundary=national_park tag in the multipolygons.

I am wondering if the best option would be to remove the
boundary=national_park and only have leisure=nature_reserve in the
multipolygons of national parks I have added so then if someone doesn't add
the --process-boundary-relations they will still get the national parks.

Regards,

Markus_g 

-----Original Message-----
From: mkgmap-dev-bounces at lists.mkgmap.org.uk
[mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk] On Behalf Of WanMil
Sent: Thursday, 26 August 2010 2:52 AM
To: Development list for mkgmap
Subject: Re: [mkgmap-dev] multipolygon wih leisure=park does not render

Hi Jeroen,

the reason for this is simple. The multipolygon algorithm need to decide 
if the mp is fully tagged or if the tags need to be taken from the mp 
ways. At the moment the mp algorithm just checks if one of the tags 
["boundary", "natural", "landuse", "land_area", "building", "waterway"] 
is set. As you see the "leisure" tag is missing. Therefore the mp tags 
are ignored and the mp uses the tags from the ways.

I will post a patch soon that adds "leisure" to the mp tags although 
that doesn't fix the real problem. The mp algorithm needs a list of all 
polygon tags or better an algorithm to decide that the mp is tagged 
appropriately. The definition of mps is not very accurate in this point.

One note about the rumours in this thread:
* multipolygons are always processed
* --process-boundary-relations ignores the mps with boundary=*

Have fun!
WanMil

> Hello all,
> I'm new here, but did not know where else to go. Recently, I noticed (at
> least) one multipolygon I created near me did not render with mkgmap
> r1655 or r1669. I did some research, but don't know what to do next.
> The polygon that does not render is 1022941 [1]. Mapnik renders it OK [2].
> Another one, very similar does render:
> http://www.openstreetmap.org/browse/relation/976305 (version 1)
> Changing the order of the members in the multipolygon (in a local OSM
> file) makes no difference.
> Removing all tags from the members also does not solve the issue.
> Changing tags for the relation from leisure=park to
> landuse=recreation_ground does enable rendering, as does landuse=park.
> Changing the tags in the style definition (polygons file, "leisure=park
> {set landuse=park}", or same line in relations file) is no solution.
> The Wiki does mention leisure=park as a possible tag [4] and I find it
> logical. Any ideas how to get this rendered (without editing the OSM
> database)?
> [1] http://www.openstreetmap.org/browse/relation/1022941 (version 1)
> [2]
> http://www.openstreetmap.org/?lat=51.916293&lon=4.421655&zoom=18&layers=M
<http://www.openstreetmap.org/?lat=51.916293&lon=4.421655&zoom=18&layers=M>
> [3] http://www.openstreetmap.org/browse/relation/976305 (version 1)
> [4] http://wiki.openstreetmap.org/wiki/Map_Features#Leisure
> Thank you,
> J-----.
> Jeroen Muris
>
>
>
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

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