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[mkgmap-dev] remove splitter option align-for-dem again or change mkgmap?

From Gerd Petermann gpetermann_muenchen at hotmail.com on Fri Jan 26 09:22:57 GMT 2018

Hi all,

sorry, seems I forget what I already found before: there is probably no way to avoid interpolation, so I think it is better to remove
the option from splitter again.


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <GPetermann_muenchen at hotmail.com>
Gesendet: Freitag, 26. Januar 2018 08:16
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] remove splitter option align-for-dem again or change      mkgmap?

Hi all,

with current code in mkgmap this option is of no use, as mkgmap rounds the dem-dist values (down) to multiples of 16.
(9942 -> 9936 , 3314 ->3312)
This means that points are always interpolated, no matter where the tile boundaries are.

So, I see two possibilites:
1) remove the option from splitter (it is not yet documented anyway)
2) change the code in mkgmap to allow using the exact dem-dist values without rounding
I think this works fine with MapSource and Basecamp, but maybe some devices will not be able to handle that,
as Garmin maps always use the rounded values.
A possible benefit of the exact values is that we may be able to avoid interpolation, at least in some areas of the world.

What do you think?


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