[mkgmap-dev] [Patch v1] Don't write useless data to NET file

Fri Oct 11 07:59:55 BST 2013

Hi,

I think mkgmap writes too much data to the NET file,
or some of it is probably wrong.

Since r2586 we "use merge-lines for all lines in all resolutions, except for
roads in res 24" 

In MapBuilder.LineAddFilter we have code that checks whether a line is a
road, if yes, 
the MapLine is added to the corresponding RoadDef instance and later it is 
written to the NET file. We do this for all resolutions, no matter wheter
the road was merged
with other lines or not. 
I wondered why this did not cause trouble, as a RoadDef instance now may
point to very different
polylines at the different resolutions. I changed the code
so that we only add the line to the RoadDef in resolution 24.
See attached patch.
reduce_net_v1.patch
<http://gis.19327.n5.nabble.com/file/n5781077/reduce_net_v1.patch>  

I did not see any change in MapSource, routing etc. seems to work as before, 
but the img file size was reduced from ~140Mb to ~130MB.

Compiled binary based on trunk version r2748 is here:
http://files.mkgmap.org.uk/download/157/mkgmap.jar

@Steve: I assume that the Garmin maps contain also 
data for lower resolutions in NET, so maybe they also
have NOD data that points to this while we have not? 

Gerd

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