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[mkgmap-dev] Special cases with LocationHook

From Henning Scholland osm at hscholland.de on Sun Jul 15 08:52:00 BST 2018

Hi Gerd.
regarding 1+2) I don't see a use case for having country information on 
natural=land/sea (natural=sea I estimate is generated by 
natural=coastline). But maybe others do... For my understand those are 
just used for colouring the map background.

In general it would be best, to not points which are out of the tile 
boundary if bounds-file is used or calculate the splitting point ( in 
case of a line) with the tile boundary and then use this as end point of 
the way for location hook.


On 15.07.2018 15:21, Gerd Petermann wrote:
> Hi all,
> while looking at the problem reported by Henning I've noticed a few special cases. Please comment:
> 1) The current code tries to set the mkgmap:admin_level? tags for generated ways with natural=sea.
> Does that make sense? Sometimes it works, esp. when the polygon is close to the coast.
> 2) The current code may fail to set mkgmap:admin_levelx tags  for ways with natural=land generated by SeaGenerator
> even if these polygons are clearly inside a country boundary. It happens when the generated way is outside the (calculated) bounding box
> of all nodes in input file, but inside the tile boundary. Such a tile is produced by splitter when you split e.g. Canada without
> trimming the tiles. Some tiles will cover large parts of the USA.
> This potential problem was introduced with r3861 : http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3861
> Gerd
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