meteogrid/mbtiles

Haskell MBTiles Library

mbtiles

Haskell library for interfacing with MapBox MBTiles files.

Documentation available on Hackage.

Functionality

• Getting tiles by zoom, x, and y.
• Writing new tiles by zoom, x, and y.
• Updating existing tiles by zoom, x, and y.
• Accessing metadata from the mbtiles file.

Basic Usage

Reading, writing, and updating tiles:

{-# LANGUAGE OverloadedStrings #-}

import qualified Data.ByteString.Lazy as BL
import           Database.Mbtiles

main = do
  let myData = "myTileData" :: BL.ByteString
  let tile   = Tile (Z 0, X 0, Y 0)
  runMbtiles "my/path/to/file.mbtiles" $ do
    maybeTileData <- getTile tile
    case maybeTileData of
      Nothing  -> writeTile tile myData
      (Just d) -> updateTile tile $ BL.init d

Getting metadata:

import Control.Monad.IO.Class
import Database.Mbtiles

main = do
  runMbtiles "my/path/to/file.mbtiles" $ do
    liftIO . print =<< getName
    liftIO . print =<< getType
    liftIO . print =<< getFormat

Future Work

• Improve database error handling.
• Investigate usage as a performant tile server.
• Add tests.