[mkgmap-dev] [PATCH v1] Support relation destination_sign

Wed Apr 17 21:41:25 BST 2013

For all those who like the --process-destination option I have added 
another feature. The patch analyses the relations with 
type=destination_sign and adds its destination and/or 
ref/destination_ref/destination:ref tag to the "to" members of the 
relations. This is performed in case the to member is a oneway way with 
highway=*_link.

The destination tag is copied from the relation if the "to" member does 
not already have a destination tag.
The same happens with the ref/destination_ref/destination:ref tags. They 
are set as destination:ref tag in case the "to" way does not already 
have a ref tag.

Afterwards the ways are processed by the common --process-destination 
algorithm.

Sounds great espacially because the number of destination_sign relations 
is growing quite well.
But: the effect of the patch is quite small.

I have compiled a map of germany.
Destination_sign relations: 3677
Destination tags copied to _link ways: 121
Destination:ref tags copied to _link ways: 41

Examples:
http://www.openstreetmap.org/browse/way/213248346 gets a destination:ref 
tag.
http://www.openstreetmap.org/browse/way/194845924 gets a destination tag.

Most of copied destination tags are the name of exits. (I didn't measure 
the values but a small sample showed this).

Anyhow try yourself with your data and let me know if it should be commited.

WanMil
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