[mkgmap-dev] extended & routable types at different resolutions

Thu Sep 19 08:31:25 BST 2019

Hi All

I noticed default style uses extended types for roundabouts  with a matching
routable line. However
extended lines are plotted starting at a lower resolution, ie

Resolution 24
junction=roundabout & (highway=trunk | highway=trunk_link) [0x0c
road_class=4 road_speed=2 resolution 24 continue]
Resoiution 18
junction=roundabout & (highway=trunk | highway=trunk_link) [0x10801
resolution 18]

In this case it does not seem to matter if 0x0c starts at resolution 24
rather than 18, or does it?

Can we presume that all  routable lines only require resolution 24 , ie

a) highway=motorway [0x100 resolution 16-20 continue] # thinnest  line
b) highway=motorway [0x101 resolution 21-23 continue] # thinner line
c) highway=motorway [0x01 road_class=4 road_speed=7 resolution 24] # default
line

Will this affect routing across tiles ?

At the moment I'm adding a transparent routable line to  a & b ie

a) highway=motorway [0x100 resolution 16-20 continue] # thinnest  line
 highway=motorway [0x17  road_class=4 road_speed=7 resolution 16-20
continue] 
b) highway=motorway [0x101 resolution 21-23 continue] # thinner line
 highway=motorway [0x17 road_class=4 road_speed=7 resolution 21-23 continue] 

Any ideas?

Thanks

Nick

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