MBTiles UTFGrid about tileserver-php

[klokan]

Initial MBTiles tile implementation in 0d4d50a. Conditional get added as function into tileserver.php, but it is not yet used - still to be done.

[klokan]

It would be also cool to expose the grid.json interaction layers out of .mbtiles files. It is pretty simple with:

$query = sprintf('SELECT grid FROM grids WHERE tile_column = %d AND tile_row = %d AND zoom_level = %d', $tile_col, $tile_row, $zoom);
...
gzinflate(substr($compressed, 2));
...

and adding traditional JSONP callback(...) around..

Discussed at: http://support.mapbox.com/discussions/general-questions/573-how-do-i-get-gridjson-files-out-of-mbtiles

[daliborjanak]

Demo of UTFGrid:
https://www.mapbox.com/demo/visiblemap/

[klokan]

A sample MBTiles to download:
http://a.tiles.mapbox.com/v3/mapbox.geography-class.mbtiles

and preview at:
http://a.tiles.mapbox.com/v3/mapbox.geography-class/page.html#2/30.3/0.0

[daliborjanak]

59c2d03

[klokan]

Our TileJSON request such as:

http://s444715029.onlinehome.us/geographyclass.json

must contain the grids value similar to the one available in:

http://a.tiles.mapbox.com/v3/mapbox.geography-class.json

It should be present ONLY if there are some UTFGrids in the MBTiles (the table 'grids' is present). The test can be done as described in http://stackoverflow.com/questions/1601151/how-do-i-check-in-sqlite-whether-a-table-exists