MBTiles - metadata - suggestion for OpenStreetMap support about mbtiles-spec HOT 4 CLOSED

While we'd love to go back and never use TMS for the silly historical reasons we did, it's important to remember that, as a rather heavily-adopted specification, breaking changes like supporting XYZ (which would break old readers with new files) would be tough to justify.

For this reason I would also suggest adding a name 'calibration_point' the default being '-180,-85.0511,180,85.0511'.

What would another value be, for example? I'm not clear on what the usefulness of this feature would be and how it's related to the tiling scheme.

from mbtiles-spec.

2014-06-16 20:24 GMT+02:00 Tom MacWright [email protected]:

While we'd love to go back and never use TMS for the silly historical
reasons we did, it's important to remember that, as a rather
heavily-adopted specification, breaking changes like supporting XYZ (which
would break old readers with new files) would be tough to justify.

For this reason I would also suggest adding a name 'calibration_point' the
default being '-180,-85.0511,180,85.0511'.

What would another value be, for example? I'm not clear on what the
usefulness of this feature would be and how it's related to the tiling
scheme.

I agree to the why. but there are database created that use a
'calibration_point' and start at that point with tile 0,0 (OruxMaps) for
one - for what ever reasons that I do not understand

• this making it clear that this information should be included in the file
• and not as others due in an extra file that may not be included

Otherwise the others (that I wrote in August 2013) ideas was mainly adding
'metadata' parameters

• when missing the default - for older reader should be assumed
  could be added - mainly osm/google tile-notation (which if I remember
  correctly was consideres a possible TODO)

Mark Johnson, Berlin Germany

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#35 (comment).

from mbtiles-spec.

I agree to the why. but there are database created that use a 'calibration_point' and start at that point with tile 0,0 (OruxMaps) for one - for what ever reasons that I do not understand

This sounds like a bug in software that implements MBTiles, that should be fixed in that software, not MBTiles.

from mbtiles-spec.

Closing; this behavior is documented and should be implemented as in the spec.

from mbtiles-spec.