[mkgmap-dev] splitter r585 implements new option align-for-dem

Thu Jan 18 14:33:56 GMT 2018

Hi Gerd,
I have quite bad news.

My map of China increased size about 300 mb (before 1.6 Gb, now 1.9Gb)
just by following this suggestion adding --align-for-dem=1200.

hgt-files are same, osm-data is same. bounding polygon for splitter is
same and also tiles look similar. I was using latest mkgmap (4070) for
both tests and
x-dem-dist=9942,9942,9942,19884,39768
x-overview-dem-dist=79536

South east asia increased from 1.15 to 1.4 Gb with same work flow.

I'm sorry :-(. If you need anything or if I should test something,
please let me know.

Henning

On 18.01.2018 01:42, Gerd Petermann wrote:
> Hi all,
>
> see http://www.mkgmap.org.uk/websvn/revision.php?repname=splitter&rev=585
>
> If I got that right you can use dem-dist 9942 for level 0 if hgt files are in 3'' resolution and splitter
> was executed with --align-for-dem=1200.
> For hgt 1'' files use dem-dist 3342 for level 0 and --align-for-dem=3600.
>
> This should reduce DEM size a lot AND increase precision.
>
> Gerd
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>

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