MBTiles cache databases have their "metadata" table unpopulated about mapproxy HOT 8 OPEN

Yes, update_metadata() is not used by MapProxy. It's not clear to me what metadata MapProxy should write into the MBTiles cache, since a cache normally doesn't now the bounds or the title/name.
Calling it from mapproxy-util export might be more useful.

from mapproxy.

Hi, wanted to use a mbtiles file produced by mapproxy with https://github.com/springmeyer/portable-node-app . It didn't work due to the missing metadata. Mapproxy should follow the MBTiles Specs https://github.com/mapbox/mbtiles-spec .

from mapproxy.

ok bring this issue back to the top now ;)

The specification is:
https://github.com/mapbox/mbtiles-spec/blob/master/1.1/spec.md

I have here a screenshot from a other file this should help:

And the "Demo" Data
10.mbtiles.zip

@olt I Think this should help

from mapproxy.

It's not clear to me what metadata MapProxy should write into the MBTiles cache, since a cache normally doesn't now the bounds or the title/name.

A cache grows over time and it would be inefficient to recalculate and update the bounding box with every stored tile. That's what I meant with a cache normally doesn't now the bounds.

from mapproxy.

yes that right, I think the main problem is that the table is missing.
I get an error that it is missing when I try to open the mbtiles file in MapTiler

maybe for the moment to have this table enter the whole range
bounds: -180,-90,180,90
center: 0,0

that is not the best solution I know but maybe later we can found a better way

from mapproxy.

@olt I am agree with you that it is "nearly" impossible for the moment for the cache to define a boundig-box using the normal mapproxy

but when I using mapproxy-seed than it should be possible to set this metadata at the end of the seeding process, isn't it?

working with mbtiles shows me that this informations are important (for me):

• bounds
• center
• minzoom
• maxzoom

from mapproxy.

Hate to resurrect an old thread. Tileserver-GL has been recognizing MBTiles created by MapProxy as vector MBTiles. After some frustrating efforts including rebuilding indices and jigging table structures, I found that it is due to the empty metadata table! Once I do "INSERT INTO metadata (name, value) VALUES('format','jpg');" Tileserver-GL immediately recognize it as raster MBTiles and renders tiles perfectly. Is it worth any effort to populate the metadata table when the MBTiles file is created?

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There is a method for doing that but I don't see it being called anywhere.

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