[mkgmap-dev] Option to delete unconnected ways?

Tue Nov 15 18:14:41 GMT 2011

it has been discussed in a similar form earlier.

it's useless and creates more problems than it solves
- islands have roads not connected to the rest, and yes sometimes we have bridges or ferry lines, but some are accessible by plane only or private boat lines only
- garmin maps are tile based. and many routable lines are not connected within a tile but connected to the next tile. mkgmap can't know what to keep.

a map generated with such an option will be completely broken. The only chance would be to take a whole planet, create a routing graph and filter out by some heuristics to make sure islands are not pruned.

On Nov 15, 2011, at 8:20 AM, Francisco Moraes wrote:

> On 2:59 PM, Carlos Dávila wrote:
>> El 14/11/11 15:04, Francisco Moraes escribió:
>>> Hi,
>>> 
>>> Is there an option to pass to mkgmap that would delete unconnected ways?
>>> Those unconnected ways lead to routing errors and are useless in a
>>> generated map.
>> Wouldn't it be better to throw a warning rather than deleting them? 
>> This way they could be fixed in the osm data. Apart from that, they 
>> can be of interest in non routable maps.
>> 
> I am not asking to do this by default, but to have an option where I can 
> delete routable ways that are disconnected. Those cause routing errors 
> if left in the map and it is not always easy to fix them. For example, 
> trails in a wooded forest. Is there another trail that leads to them or 
> not? Easy to fix if you know the area but not so easy if you are relying 
> on satellite photos.
> 
> Just my 2 cents.
> 
> Francisco
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