[mkgmap-dev] merge-lines and routing

Fri May 3 17:42:27 BST 2013

> Hi WanMil,
>
> okay, this will be a big change that requires a branch. So, for now,
> I'd like to finish the merge-lines issue.
> Attached is version 2 of the patch that allows merging lines at all
> resolutuions
> except for roads on res 24.

Looks good.

>
> Some numbers for a map of niedersachsen with default style and lots of
> enabled features:
> (seconds run time,  gmapsupp.img size in bytes)
> r2581 with merge-lines: 99s, 127.567.872
> r2581 with no-merge-lines: 103s, 128.182.272
> patched r2585 with merge-lines: 95s, 125.599.744
> patched r2585 with no-merge-lines: like r2581

Oh, I didn't expect that merge-lines noticeably decreases processing 
time. Nice :-)

>
> I see no good reason why merge-lines is an option. I think we should enable
> it and remove the parm, or at least, make merge-lines the default and allow
> to switch it off with --no-merge-lines.

+1

>
> Compiled binary is here:
> |http://files.mkgmap.org.uk/download/119/mkgmap.jar
>
> |Gerd
>