Minko (ligfietser@online.nl) wrote:

...

I have enabled the add-pois-to-areas option, because this way I can search for a certain tag that is placed on an area like landuse=*, tourism=* or building=yes. But sometimes those pois are cluttering the map, especially if this area is a type=multipoygon relation.

Take for example this multipolygon relation: http://www.openstreetmap.org/browse/relation/949481 tourism=zoo is tagged only once on the outer way: http://www.openstreetmap.org/browse/way/61046378

However, the multipolygon function of mkgmap splits this area up in several parts (to render the inner islands, which is fine) but it also creates too many pois by the add-pois-to-areas for this one tourism=zoo area: http://img546.imageshack.us/img546/5763/zoow.jpg

I'd like to see just one elephant icon instead of several. Is it possible to execute the add-pois-to-areas action before the multipolygon action takes place? Or is it possible to set some rules in the style file to make some exceptions for areas with type=multipolygon?

This is a known issue (http://wiki.openstreetmap.org/wiki/Mkgmap/known_issues#Too_many_POIs_for_a_g...).

WanMil had a look at it a few months back and concluded that there wasn't a quick fix (http://www.mail-archive.com/mkgmap-dev@lists.mkgmap.org.uk/msg07431.html).

I would really like to see this bug fixed as it can add many duplicate POIs to a map.

Maybe it's not be too difficult to fix that. Here is my idea: Just before the style conversion one point for each polygon is added with a copy of all tags plus mkgmap:poly2poi=true. Polygons contained in or created by a multipolygon are excluded but additionaly one point for each multipolygon is added. Now the rules in the points style are applied automatically. Sounds too simple...? Any objections to such a solution? WanMil

WanMil schrieb am 27.09.2011 19:27:

Maybe it's not be too difficult to fix that. Here is my idea: Just before the style conversion one point for each polygon is added with a copy of all tags plus mkgmap:poly2poi=true. Polygons contained in or created by a multipolygon are excluded but additionaly one point for each multipolygon is added.

Now the rules in the points style are applied automatically.

I think you also have to change the style file, so that all the polygons created by the mp processing are not used by the style conversion. This should be easy by checking that there is no mkgmap:mp_created tag. I think (in a first step) you need not to care, whether teh created POI is within the mp area or within a hole, because also for normal (concave) polygons right now it is not ensured, that the created POI is within the polygon. Gruss Torsten

WanMil schrieb am 27.09.2011 23:28:

Do I understand you correct?: The polygons style should be used for polygons created by mp processing but only one POI should be created for the whole multipolygon and not one for each mp created polygon.

I think, we are in agreement here: 1. A mp-relation is converted into multiple single polygons to be used by the polygon style processing. and now your suggestion (as I understand it): 2. Additionally a single POI is created for the whole mp-relation, with all the tags from the relation plus a mkgmap:poly2poi=true What I wanted to point out: If you are now creating POIs from the areas, you have to make sure in your style files, that you do not get additional POIs from the polygons created in step one. Gruss Torsten