Comments (3)
For one thing that file has odd min and maxzoom settings:
"OSM-OpenCPN2-Europa1-20190621-0730": {
"identifier": "OSM-OpenCPN2-Europa1-20190621-0730",
"name": "Europa1",
"bounds": [
4.405517578125,
43.45291889355465,
16.995849609375,
54.32613472050531
],
"minzoom": 16,
"maxzoom": 16,
"format": "png",
"type": "tilelayer",
"tilemapUrl": "/signalk/v1/api/resources/charts/OSM-OpenCPN2-Europa1-20190621-0730/{z}/{x}/{y}",
"scale": "250000"
},
from charts-plugin.
There is only one zoom level in the file:
sqlite> select distinct zoom_level from tiles;
16
and if you zoom in to that level there is detail there, here shown Zellsee by RadolfZell
Where did these files come from? The Baltic file has more zoom levels available:
k$ echo "select distinct zoom_level from tiles" | sqlite3 OSM-OpenCPN2-Baltic-20190618-1343.mbtiles
8
10
12
14
16
from charts-plugin.
Oh... It seems I never hit exactly that zoom level. But that explains the problems, and is also consistent with the finding that the KAP file (the other format for the same region on that website) has the same behavior of only consisting of one level. It seems I need to find out how to request an update of the map files.
I found that MOBAC (https://mobac.sourceforge.io/) can create the correct maps (when feed with updated tile sources), but I would prefer not to do that myself, because it requires downloading a huge number of tiles for decently sized maps, which is "discouraged" by the server usage policies.
from charts-plugin.
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