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Hi all I have setup an osm tile server (following switch2osm) and wrote a simple openlayers script to browse the content. I have seen a problem that is for certain parts on the map when I zoomed into certain levels, the tiles were just missing and the missing areas were simply blank squares. I have checked the tiles that are missing are always for the same areas at the same zoom level. I downloaded the osm data from bbbike.org. Any idea on how this happens and what I should do to fix it? Thanks. I have uploaded a screen-shot as well as a Youtube video that can visually show the problem. Video: link text
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I suspect that @scai hit the nail on the head above - the renderer isn't able to render tiles fast enough for them to appear in the browser. When I see this problem I do the following: (note the space after "TILE") You should see "START TILE" and "DONE TILE" lines in response for tile requests. If a tile fails to appear, wait for the "DONE TILE" line and then refresh the request for it in the browser and you should see it. |
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Dalishi, since you’ve downloaded the OSM data from a third party, there several update changes possible. Tiles are updated at different levels and moments. So ask the operator bbbike.org for their update frequency or even an explanation. Collect them over a certain period and remember that the tiles are updated all the time, just as everything else in OSM. Consider a download directly from the OSM servers as well. He is running his own tile server.
(10 Sep '15, 10:49)
scai ♦
Hi @Hendrikklaas thanks for your reply. The problem seems because my browser's cache. I did what @scai suggested and problem solved. Still try to figure out what's going on behind. Thanks.
(10 Sep '15, 11:20)
dalishi
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Are exactly the same tiles still missing if you try to access them after a few minutes? Try to empty your browser cache before trying to access them again.
Hi @scai you hit the point. First I deleted all the rendered tiles from /var/lib/mod_tile, observed not exactly the same tiles missing. Some missing tiles come back. Then I tried to clear my browser's cache and problem seems solved. The previous missing tiles appeared. Thanks for your enlightening. But I still want to figure out the reason behind this why it is happening.
Just a guess but maybe your tile server is just too slow for rendering and/or delivering the tiles within time.