grid.json storage

[calvinmetcalf]

exactly how the grids are stored in the file is not clearly defined making attempts at mbtile implementation which include grids difficult.

As far as I can tell they are spread across 3 fields in 2 views, with "keys":{ and "grid"{ including in the database but but "data":{ and grid( not plus 1 of the 3 fields is gziped.

[tmcw]

Hmm, we could expand the specification a bit more in that direction, but the optimizations in most of the MBTiles implementations are outside of the spec - only the interface is specified exactly, not the views or anything like that. Views are a transparent way of compressing both tile & grid data (in pretty much the same way).

[calvinmetcalf]

the non intuitive thing is just how you have to query 3 fields and put them together for the grids but not the tiles.

[tmcw]

You mean with the views? As far as TileMill output, it's views for both grids and images.

[calvinmetcalf]

oh sorry for the confusion, the fact that they are views not fields isn't an issue, the fact that to access the tile.json you have to querry grid field in the grids view plus key_name and key_json from grid_data and put them together is the confusing part