Die Grenzen im split-file (areas.list) sollten in *G*armin*U*nits geschrieben werden. 1GU =~0,0000214576... (exact : 360°/2^ 24). Und die GU sollen ohne Rest durch 4 teilbar sein. Beispiel: 47 ° /0,0000214576=2.190.366,117 *GU* .Die nächste durch 4 teilbare Zahl ist : 2190368. Mit diesem Verfahren gab es noch nie Probleme. Routing funktioniert. Die Abweichung zu 47° ist 0,00004039...° (weil 2190368*0,0000214576 = 47,0000403968°). Weniger als 5m .Kannst praktisch vergessen.
thomas

Am 05.08.2017 um 20:54 schrieb thesurve...@wolke7.net:
Hi all,
I've a question about splitting a map.
I'm using splitter to split a large pbf-file with contourlines to about 300 tiles. This works fine. But now I have the requirement to support a process with two parts of the whole map, splitted exactly at a given latitude. So I've written a simple tool that reads the tile-list from splitter ( --write-kml), searches for the tiles which are north or south of the given latitude and writes them to a file. For the tiles which are divided by the given latitude the tool divides the tile in two parts and writes the parts as new tiles to the file. As the next step splitter is called again with the file as a parameter (--split-file) and mkgmap is used to create the two maps. All this works wonderful, but yesterday I've seen that Basecamp crashes when I install those tiles. I'm doing this since several years now, but never noticed that behaviour. Maybe I didn't see it, because I'm not using Basecamp very often. So today I spent some hours to look deeper into that problem. I could eliminate one tile. Then I noticed that size of this tile is just about 8 kB. And when I deleted the tile from the map Basecamp doesn't crash anymore. Of course the map should have a hole now :-) Ok, so far so good, but what's the reason for that behaviour. This tile was splitted by my tool. So maybe I'm doing something wrong.
But I have splitted a lot more tiles which seem to work.
So I have some questions:
1) I'm splitting the tiles into two parts, at full or half degrees, e,g. 47.00000 or 47.50000.
2) The mentioned tile is less than 1 degree in north to south direction.
Could one ot those questions lead to that behaviour?
Do you have another idea what could be wrong with a tile that crashes Basecamp. Or do you have an idea what to check?
The map is working well on different Garmin devices (Oregon, etrex hcx).
Many thanks for your support.
Best regards,
Gert


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