[mkgmap-dev] splitter default resolution 13 and overview map from default style

Tue Jun 1 15:38:27 BST 2021

Hallo Gerd

You just solved a long time wish of getting country borders more nice at low zoom:

Left with overview 8:12  and right with lowest  8:13 (which is much nicer !)

Basecamp zoomlevel 300km

Gulf of Genua

[cid:image001.png at 01D75704.89BA1B80]

Met vriendelijke groeten,

Joris Bo

jorisbo at hotmail.com<mailto:jorisbo at hotmail.com>

-----Oorspronkelijk bericht-----
Van: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk>> Namens Gerd Petermann
Verzonden: dinsdag 1 juni 2021 15:30
Aan: mkgmap-dev at lists.mkgmap.org.uk<mailto:mkgmap-dev at lists.mkgmap.org.uk>
Onderwerp: [mkgmap-dev] splitter default resolution 13 and overview map from default style

Hi all,

I am not sure but I think it is a bad idea to have overview-levels = 4:17, 5:16, 6:15, 7:14, 8:12 in the default style.

The lowest resolution is 12 while splitter uses the default 13 for its resolution. This also means that tiles from splitter are aligned to a resolution of 13. The lowest level in the overview map is therefore sometimes much more distorted at tile boundaries than the next higher. I think it should be changed to overview-levels = 4:17, 5:16, 6:15, 7:14, 8:13

I've never thought about this relationship between splitter and the overview map. Just wondered why my test data looks so ugly at resolution 12.

An alternative would be to remove the lowest level completely.

Maybe mkgmap should print a warning when tiles are not aligned for the lowest resolution used in the map?

Any thoughts?

Gerd

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