[mkgmap-dev] map features and detail levels

Sat Mar 21 21:30:32 GMT 2009

Hi!

Paul Ortyl schrieb:
> I have noticed unusual behaviour of some POIs.  I cannot understand
> why some types are shown even at low detail level where others are
> not.
> An example:
> point|tourism|picnic_site|0x4a|0x00|20
> point|tourism|information|0x4c|0x00|20
> point|amenity|toilets|0x4e|0x00|20
> are visible in MapSource even as all other POIs with resolution at 20
> or slightly less are no more there.
> 
> Does MapSource treat these three types specially?  That is resolution
> 20 for these types means something else as for other types?
> I have double-checked (grep -r) for "picnic_site" in my garmin related
> directories, and the only definition of this feature sets the
> resolution to 20.

When creating custom styles, I have observed that in the Garmin maps 
some POI types are treated differently. Of several pois with different 
types and identical resolution, some show earlier and some show later. 
Objects with id 0x1e show up earlier than objects with id 0x17 even 
though both have resolution 21.

I have seen this behavious on the device, but I guess it may be the same 
principle in MapSource.

bye
	Nop