gdal2mbtiles helps you generate web mapping tiles that can be shown through a browser-based mapping library on your website.
GDAL-readable files are images that are georeference, that means that they are positioned and projected on to the world. In order to display a dynamic map on the web, you don't want to serve the whole image at once, so it must be sliced into tiles that are hosted by a tile server.
The MBTiles file format was developed by MapBox to make tile storage easier. You can upload the final file to their service, or run your own tile server. MapBox provides one called TileStream.
Later versions of GDAL (>= 2) allow generation of mbtiles files via the gdal_translate and gdaladdo commands. However, gdal2mbtiles offers some advantages:
- allows you to specify an upper resolution/zoom level. GDAL always uses the native resolution of the input raster to determine the highest zoom level of the mbtiles output, whereas gdal2mbtiles can also upsample to create zoom levels at a higher resolution than your original file.
- the
gdal_translatecommand only converts the geotiff at the native resolution, so the lower resolutions are added to the file via overviews (gdaladdo) gdaladdocan only add overviews down to the zoom level corresponding to the size of the tile/block size (256x256). gdal2mbtiles can always create images down to zoom level 1.- performance: gdal2mbtiles uses pyvips for image processing, which is parallel and quick. Compared to the equivalent processing with GDAL, gdal2mbtiles is typically 2-4 times quicker. For example:
- a resolution 14 file, 13000x11000 pixels, min resolution 0, max resolution 14: ~5 minutes with gdal2mbtiles and ~8 minutes with GDAL commands.
- a resoluton 11 file, 200,000x200,000, zoom level 11 only: ~30min with gdal2mbtiles and ~133min with GDAL (with
GDAL_CACHE_MAXandGDAL_NUM_THREADSoptions)
Using pip:
$ pip install gdal2mbtilesPyPi package page https://pypi.python.org/pypi/gdal2mbtiles/
From source:
$ git clone https://github.com/ecometrica/gdal2mbtiles.git
$ cd gdal2mbtiles
$ python setup.py installNote that this program requires Python 2.7 or higher.
We rely on GDAL to read georeferenced datasets.
Under Debian or Ubuntu, run the following to install it:
$ sudo add-apt-repository ppa:ubuntugis/ppa && sudo apt-get update
$ sudo apt-get install gdal-bin libgdal-devYou will need to install the PyPi GDAL package with the following options:
$ pip install --global-option=build_ext --global-option=--gdal-config=/usr/bin/gdal-config --global-option=--include-dirs=/usr/include/gdal/ GDAL==$(GDAL_VERSION)We also rely on VIPS (version 8.2+) to do fast image processing.
Under Debian or Ubuntu, run the following to install it:
$ sudo apt-get install libvips libvips-devYou'll also need a few other libraries to deal with large TIFF files and to optimize the resulting PNG tiles.
Under Debian or Ubuntu, run the following to install them:
$ sudo apt-get install libtiff5 optipng pngquant$ gdal2mbtiles --help
usage: gdal2mbtiles [-h] [-v] [--name NAME] [--description DESCRIPTION]
[--layer-type {baselayer,overlay}] [--version VERSION]
[--format {jpg,png}]
[--spatial-reference SPATIAL_REFERENCE]
[--resampling {near,bilinear,cubic,cubicspline,lanczos}]
[--min-resolution MIN_RESOLUTION]
[--max-resolution MAX_RESOLUTION] [--fill-borders]
[--no-fill-borders] [--zoom-offset N]
[--coloring {gradient,palette,exact}]
[--color BAND-VALUE:HTML-COLOR]
[--colorize-band COLORIZE-BAND]
[INPUT] [OUTPUT]
Converts a GDAL-readable into an MBTiles file
optional arguments:
-h, --help show this help message and exit
-v, --verbose explain what is being done
Positional arguments:
INPUT GDAL-readable file.
OUTPUT Output filename. Defaults to INPUT.mbtiles
MBTiles metadata arguments:
--name NAME Human-readable name of the tileset. Defaults to INPUT
--description DESCRIPTION
Description of the layer. Defaults to ""
--layer-type {baselayer,overlay}
Type of layer. Defaults to "overlay"
--version VERSION Version of the tileset. Defaults to "1.0.0"
--format {jpg,png} Tile image format. Defaults to "png"
GDAL warp arguments:
--spatial-reference SPATIAL_REFERENCE
Destination EPSG spatial reference. Defaults to 3857
--resampling {near,bilinear,cubic,cubicspline,lanczos}
Resampling algorithm for warping. Defaults to "near"
(nearest-neighbour)
Rendering arguments:
--min-resolution MIN_RESOLUTION
Minimum resolution to render and slice. Defaults to
None (do not downsample)
--max-resolution MAX_RESOLUTION
Maximum resolution to render and slice. Defaults to
None (do not upsample)
--fill-borders Fill image to whole world with empty tiles. Default.
--no-fill-borders Do not add borders to fill image.
--zoom-offset N Offset zoom level by N to fit unprojected images to
square maps. Defaults to 0.
Coloring arguments:
--coloring {gradient,palette,exact}
Coloring algorithm.
--color BAND-VALUE:HTML-COLOR
Examples: --color="0:#ff00ff" --color=255:red
--colorize-band COLORIZE-BAND
Raster band to colorize. Defaults to 1Please check our issue tracker for known bugs and feature requests.
We accept pull requests for fixes and new features.
Maxime Dupuis and Simon Law wrote this program, with the generous support of Ecometrica.
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