# TileCloud
A powerful utility for generating, managing, transforming, and visualizing map tiles in multiple formats.
## Introduction
TileCloud is a powerful utility for generating, managing, transforming, visualizing and map tiles in multiple
formats. It can create, read update, delete tiles in multiple back ends, called TileStores. Existing
TileStores include:
- HTTP/REST in any layout
- WMTS
- Amazon [S3](http://aws.amazon.com/s3/) and [SQS](http://aws.amazon.com/sqs/)
- [MBTiles](https://github.com/mapbox/mbtiles-spec)
- [TileJSON](https://github.com/mapbox/TileJSON)
- [Mapnik](http://mapnik.org/) (via [mapnik2](http://pypi.python.org/pypi/mapnik2))
- [Memcached](http://memcached.org/)
- Local file system
- Log files in any format
TileCloud is not limited to image tiles, it can also handle other tile data such as
[UTFGrid](https://github.com/mapbox/utfgrid-spec), or elevation data in JSON format.
TileCloud uses Python's generators and iterators to efficiently stream tens of millions of tiles, and can
handle multiple tiles in parallel using Python's
[multiprocessing](http://docs.python.org/library/multiprocessing.html) library.
Example tasks that TileCloud makes easy include:
- Visualize tiles stored in any TileStore with [OpenLayers](http://www.openlayers.org/), [Google
Maps](http://maps.google.com/), [jQuery Geo](http://www.jquerygeo.com/),
[Leaflet](http://leaflet.cloudmade.com/), [Polymaps](http://polymaps.org/), [Modest
Maps](http://www.modestmaps.com/), and [OpenWebGlobe](http://www.openwebglobe.org/).
- Convert sixty million PNG tiles stored in S3 to JPEG format with different quality settings at different
zoom levels.
- Transform image formats and perform arbitrary image transformations on the fly, including PNG
optimization.
- Generate semi-transparent tiles with embedded tile coordinates for debugging.
- Pack multiple tile layers into a single tile on the server.
- Efficiently calculate bounding boxes and detect missing tiles in existing tile datasets.
- Simulate fast and slow tile servers.
- Efficiently delete millions of tiles in S3.
- Read JSON tiles from a tarball, compress them, and upload them.
## Getting started
TileCloud depends on some Python modules. It's easiest to install them with `pip` in a `virtualenv`:
$ pip install poetry
$ poetry install
For a quick demo, run
$ poetry run tc-viewer --root=3/4/2 'http://gsp2.apple.com/tile?api=1&style=slideshow&layers=default&lang=en_GB&z=%(z)d&x=%(x)d&y=%(y)d&v=9'
and point your browser at <http://localhost:8080/>. Type `Ctrl-C` to terminate `tc-viewer`.
Next, download an example MBTiles file from [MapBox](http://mapbox.com/), such as [OSM map](https://wiki.openstreetmap.org/wiki/MBTiles#Offline-Karten). We can quickly find out more about this tile set
with the `tc-info` command. For example, to count the number of tiles:
$ poetry run tc-info -t count OSM-OpenCPN2-MagellanStrait.mbtiles
51672
To calculate the bounding pyramid:
$ poetry run tc-info -t bounding-pyramid -r OSM-OpenCPN2-MagellanStrait.mbtiles
8/72/168:+16/+16
10/296/680:+40/+32
12/1184/2728:+144/+104
14/4760/10935:+536/+393
16/19048/43760:+2112/+1552
To check for missing tiles against a bounding pyramid:
$ poetry run tc-info -b 8/72/168:16/*/* -t completion OSM-OpenCPN2-MagellanStrait.mbtiles
8 256/65536 (0%)
9 0/262144 (0%)
10 832/1048576 (0%)
11 0/4194304 (0%)
12 4392/16777216 (0%)
13 0/67108864 (0%)
14 21408/268435456 (0%)
15 0/1073741824 (0%)
16 24784/4294967296 (0%)
This shows, for each zoom level, the number of tiles at that zoom level, the total number of tiles expected at
that zoom level for the specified bounding pyramid (`8/0/0:16/*/*` means all tiles from level 8 to level 16),
and a percentage completion. This can be useful for checking that a tile set is complete.
Now, display this MBTiles tile set on top of the [OpenStreetMap](http://www.openstreetmap.org/) tiles and a
debug tile layer:
$ poetry run tc-viewer tiles.openstreetmap_org OSM-OpenCPN2-MagellanStrait.mbtiles tiles.debug.black
You'll need to point your browser at <http://localhost:8080/> and choose your favorite library.
`tc-info` and `tc-viewer` are utility programs. Normally you use TileCloud by writing short Python programs
that connect the TileCloud's modules to perform the action that you want.
As a first example, run the following:
$ poetry run examples/download.py
This will download a few tiles from [OpenStreetMap](http://www.openstreetmap.org/) and save them in a local
MBTiles file called `local.mbtiles`. Look at the source code to `examples/download.py` to see how it works. If
there are problems with the download, just interrupt it with `Ctrl-C` and re-run it: the program will
automatically resume where it left off.
Once you have downloaded a few tiles, you can view them directly with `tc-viewer`:
$ poetry run tc-viewer --root=4/8/5 local.mbtiles tiles.debug.black
Point your browser at <http://localhost:8080> as usual. The `--root` option to `tc-viewer` instructs the
viewer to start at a defined tile, rather than at 0/0/0, so you don't have to zoom in to find the tiles that
you downloaded.
## Changelog
### 1.9.0
- Add the following extra dependencies `azure`, `aws`, `wsgi`, `redis`, `all`.
## Tile coordinates, tile layouts, tile grids and bounding pyramids
TileCloud always represents tile coordinates as strings like `z/x/y`. TileCloud primarily works in tile
coordinates, although geographic coordinates can be used in some places.
Tile layouts convert tile coordinates to and from strings for use in paths, URLs, keys, etc.
Tile grids are used to convert tile coordinates to and from geographic coordinates, and to relate tiles with
different z values.
Bounding pyramids represent a range of tiles in the x, y and z directions. The format is basically
`minz/minx/miny:maxz/maxx/maxy` but `maxz` is optional and `maxz`, `maxx` and `maxy` can be prefixed with an
`+` sign to indicate that they are relative to the corresponding `min` value. This is probably best
demonstrated by a few examples:
`4/10/20:15/25`
: This corresponds to a range of tiles with z=4, x=10..15 and y=20..25
`4/10/20:+5/+5`
: This is the same range (z=4, x=10..15, y=20..25) but expressed using relative sizes.
`4/10/20:5/15/20`
: This is the same range of tiles above, but also includes all the tiles at level z=5 which overlap the
above range. TileCloud uses the tile grid to calculate which tiles from level z=5 to include.
`4/10/20:+1/+5/+5`
: This represents the range same as the previous example using a relative `maxz`.
## Quick tile generation
The `tc-copy` command can be used to copy tiles between different TileStores. If a TileStore has the side
effect of generating tiles, then it functions as a quick tile generation utility. First, some quick examples.
To convert from one tile format to another, just copy from source to destination. For example, to convert an
MBTiles file in to a ZIP file, just run:
$ poetry run tc-copy OSM-OpenCPN2-MagellanStrait.mbtiles geography-class.zip
You can check this worked with `unzip`:
$ unzip -t geography-class.zip
Equally, `tc-copy` can be used to download multiple tiles:
$ poetry run tc-copy --bounding-pyramid 4/0/0:0/16/16 tiles.openstreetmap_org osm-up-to-z4.mbtiles
Here we downloaded zoom levels 0 to 4 of the OpenStreetMap tiles into a local MBTiles file. The
`--bounding-pyramid` option is required because otherwise we would download _all_ OpenStreetMap tiles -- which
might take some time (and also contravene OpenStreetMap's tile usage policy). Note that, by default, `tc-copy`
won't overwrite tiles if they already exist in the destination. This means that you can interrupt the above
command and restart it, and it will resume where it was interrupted. If you want to overwrite tiles in the
destination then pass the `--overwrite` option to `tc-copy`.
In the same way, `tc-copy` can also be used to upload tiles. For example, to upload an MBTiles file to S3,
just use:
$ poetry run tc-copy osm-up-to-z4.mbtiles s3://bucket/prefix/%(z)d/%(x)d/%(y)d.jpg
`bucket` is the name of your S3 bucket. You'll need to have set the `AWS_ACCESS_KEY_ID` and
`AWS_SECRET_ACCESS_KEY` environment variables to have permission to upload to S3. The rest of the destination
(`prefix/%(z)d/%(x)d/%(y)d.jpg`) is a template describing the layout of the tiles in S3. It's a normal Python
format string: `%(x)d` means substitute the tile's `x` coordinate as a decimal integer.
You can pass the same `s3://` URL to `tc-viewer`. This allows you to visualize your tiles stored in S3 with
your favorite mapping library. For example:
$ poetry run tc-viewer s3://bucket/prefix/%(z)d/%(x)d/%(y)d.jpg
Here, `tc-viewer` is acting as a proxy, serving tiles stored in S3 over HTTP, bypassing any caches or access
controls (assuming you have the correct credentials, of course). This allows you to visualize the exact tiles
that you've stored.
## Rendering the World
At [FOSS4G-NA](http://foss4g-na.org/), [MapBox](http://mapbox.com/) presented an excellent strategy for
[rendering the world](http://mapbox.com/blog/rendering-the-world/). TileCloud supports the subdivision
strategy. To run the demo, execute:
$ poetry run examples/renderingtheworld.py
This will generate tiles from a WMTS tile server and save them in a local MBTiles tiles. When the above
command is complete, you can see the bounding pyramid of the generated tiles:
$ poetry run tc-info -t bounding-pyramid -r medford_buildings.mbtiles
0/0/0:+1/+1
1/0/0:+1/+1
2/0/1:+1/+1
3/1/2:+1/+1
4/2/5:+1/+1
5/5/11:+1/+1
6/10/23:+1/+1
7/20/47:+1/+1
8/40/94:+2/+2
9/80/189:+2/+1
10/162/378:+1/+2
11/324/757:+2/+2
12/649/1514:+3/+3
13/1299/3028:+4/+5
14/2598/6057:+7/+8
15/5196/12114:+13/+15
You can look at these tiles (which show buildings in Medford, OR) with the command:
./tc-viewer --root=7/20/47 tiles.openstreetmap_org medford_buildings.mbtiles
## A cheap-and-cheerful tile server
`tc-viewer` can be used as a lightweight tile server, which can be useful for development, debugging and
off-line demos. The TileStores passed as arguments to `tc-viewer` are available at the URL:
http://localhost:8080/tiles/{index}/tiles/{z}/{x}/{y}
where `{index}` is the index of the TileStore on the command line (starting from 0 for the first tile store),
and `{z}`, `{x}` and `{y}` are the components of the tile coordinate. The second `tiles` in the URL is present
to work around assumptions made by OpenWebGlobe. This layout is directly usable by most mapping libraries, see
the code in `tilecloud/views/*.tpl` for examples. The host and port can be set with the `--host` and `--port` command
line options, respectively.
Note that there is no file extension. `tc-viewer` will automatically set the correct content type and content
encoding headers if it can determine them, and, failing this, most browsers will figure it out for themselves.
For convenience, `tc-viewer` serves everything in the `static` directory under the URL `/static`. This can be
used to serve your favorite mapping library and/or application code directly for testing purposes.
By default, `tc-viewer` will use [Tornado](http://www.tornadoweb.org/) as a web server, if it is available,
otherwise it will fall back to [WSGIRef](http://docs.python.org/library/wsgiref.html). Tornado has reasonably
good performance, and is adequate for local development and off-line demos, especially when used with a
MBTiles TileStore. WSGIRef has very poor performance (it handles only one request at a time) and as such can
be used as a "slow" tile server, ideal for debugging tile loading code or testing how your web application
performs over a slow network connection. `tc-viewer` is particularly slow when used to proxy tiles being
served by a remote server. You can set the server explicitly with the `--server` option.
`tc-viewer` sets the `Access-Control-Allow-Origin` header to `*` for all the tiles it serves, this allows the
tiles to be used as textures for WebGL applications running on different hosts/ports. For more information,
see [Cross-Domain Textures](https://developer.mozilla.org/en/WebGL/Cross-Domain_Textures).
`tc-viewer` is designed as a development tool, and the power that it offers comes at the expense of fragility.
It makes many assumptions - including the benevolence of the user - that make it entirely unsuitable as a
generic tile server. It should only be used in development or demonstration environments.
## Comparing mapping libraries
`tc-viewer` supports most popular web mapping libraries out-of-the box. This can be very useful for quick,
practical comparisons. If your favorite mapping library is missing, please submit an
[issue](https://github.com/camptocamp/tilecloud/issues), or, even better, a [pull
request](https://github.com/camptocamp/tilecloud/pulls).
## Contributing
Please report bugs and feature requests using the [GitHub issue
tracker](https://github.com/camptocamp/tilecloud/issues).
If you'd like to contribute to TileCloud, please install the development requirements:
$ pip install -r dev-requirements.txt
TileCloud comes with unit tests in the `tilecloud/tests` directory. You can run these with the command:
$ make test
This is equivalent to:
$ python setup.py nosetests
For pull requests, it is very much appreciated if your code passes `prospector` without warnings. You can run
prospector on the codebase with the command:
$ make prospector
## License
Copyright (c) 2012, Tom Payne <twpayne@gmail.com> All rights reserved.
Copyright (c) 2012, Camptocamp All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that
the following conditions are met:
- Redistributions of source code must retain the above copyright notice, this list of conditions and the
following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
vim: set filetype=rst spell spelllang=en textwidth=0:
## Contributing
Install the pre-commit hooks:
```bash
pip install pre-commit
pre-commit install --allow-missing-config
```
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"description": "# TileCloud\n\nA powerful utility for generating, managing, transforming, and visualizing map tiles in multiple formats.\n\n## Introduction\n\nTileCloud is a powerful utility for generating, managing, transforming, visualizing and map tiles in multiple\nformats. It can create, read update, delete tiles in multiple back ends, called TileStores. Existing\nTileStores include:\n\n- HTTP/REST in any layout\n- WMTS\n- Amazon [S3](http://aws.amazon.com/s3/) and [SQS](http://aws.amazon.com/sqs/)\n- [MBTiles](https://github.com/mapbox/mbtiles-spec)\n- [TileJSON](https://github.com/mapbox/TileJSON)\n- [Mapnik](http://mapnik.org/) (via [mapnik2](http://pypi.python.org/pypi/mapnik2))\n- [Memcached](http://memcached.org/)\n- Local file system\n- Log files in any format\n\nTileCloud is not limited to image tiles, it can also handle other tile data such as\n[UTFGrid](https://github.com/mapbox/utfgrid-spec), or elevation data in JSON format.\n\nTileCloud uses Python's generators and iterators to efficiently stream tens of millions of tiles, and can\nhandle multiple tiles in parallel using Python's\n[multiprocessing](http://docs.python.org/library/multiprocessing.html) library.\n\nExample tasks that TileCloud makes easy include:\n\n- Visualize tiles stored in any TileStore with [OpenLayers](http://www.openlayers.org/), [Google\n Maps](http://maps.google.com/), [jQuery Geo](http://www.jquerygeo.com/),\n [Leaflet](http://leaflet.cloudmade.com/), [Polymaps](http://polymaps.org/), [Modest\n Maps](http://www.modestmaps.com/), and [OpenWebGlobe](http://www.openwebglobe.org/).\n- Convert sixty million PNG tiles stored in S3 to JPEG format with different quality settings at different\n zoom levels.\n- Transform image formats and perform arbitrary image transformations on the fly, including PNG\n optimization.\n- Generate semi-transparent tiles with embedded tile coordinates for debugging.\n- Pack multiple tile layers into a single tile on the server.\n- Efficiently calculate bounding boxes and detect missing tiles in existing tile datasets.\n- Simulate fast and slow tile servers.\n- Efficiently delete millions of tiles in S3.\n- Read JSON tiles from a tarball, compress them, and upload them.\n\n## Getting started\n\nTileCloud depends on some Python modules. It's easiest to install them with `pip` in a `virtualenv`:\n\n $ pip install poetry\n $ poetry install\n\nFor a quick demo, run\n\n $ poetry run tc-viewer --root=3/4/2 'http://gsp2.apple.com/tile?api=1&style=slideshow&layers=default&lang=en_GB&z=%(z)d&x=%(x)d&y=%(y)d&v=9'\n\nand point your browser at <http://localhost:8080/>. Type `Ctrl-C` to terminate `tc-viewer`.\n\nNext, download an example MBTiles file from [MapBox](http://mapbox.com/), such as [OSM map](https://wiki.openstreetmap.org/wiki/MBTiles#Offline-Karten). We can quickly find out more about this tile set\nwith the `tc-info` command. For example, to count the number of tiles:\n\n $ poetry run tc-info -t count OSM-OpenCPN2-MagellanStrait.mbtiles\n 51672\n\nTo calculate the bounding pyramid:\n\n $ poetry run tc-info -t bounding-pyramid -r OSM-OpenCPN2-MagellanStrait.mbtiles\n 8/72/168:+16/+16\n 10/296/680:+40/+32\n 12/1184/2728:+144/+104\n 14/4760/10935:+536/+393\n 16/19048/43760:+2112/+1552\n\nTo check for missing tiles against a bounding pyramid:\n\n $ poetry run tc-info -b 8/72/168:16/*/* -t completion OSM-OpenCPN2-MagellanStrait.mbtiles\n 8 256/65536 (0%)\n 9 0/262144 (0%)\n 10 832/1048576 (0%)\n 11 0/4194304 (0%)\n 12 4392/16777216 (0%)\n 13 0/67108864 (0%)\n 14 21408/268435456 (0%)\n 15 0/1073741824 (0%)\n 16 24784/4294967296 (0%)\n\nThis shows, for each zoom level, the number of tiles at that zoom level, the total number of tiles expected at\nthat zoom level for the specified bounding pyramid (`8/0/0:16/*/*` means all tiles from level 8 to level 16),\nand a percentage completion. This can be useful for checking that a tile set is complete.\n\nNow, display this MBTiles tile set on top of the [OpenStreetMap](http://www.openstreetmap.org/) tiles and a\ndebug tile layer:\n\n $ poetry run tc-viewer tiles.openstreetmap_org OSM-OpenCPN2-MagellanStrait.mbtiles tiles.debug.black\n\nYou'll need to point your browser at <http://localhost:8080/> and choose your favorite library.\n\n`tc-info` and `tc-viewer` are utility programs. Normally you use TileCloud by writing short Python programs\nthat connect the TileCloud's modules to perform the action that you want.\n\nAs a first example, run the following:\n\n $ poetry run examples/download.py\n\nThis will download a few tiles from [OpenStreetMap](http://www.openstreetmap.org/) and save them in a local\nMBTiles file called `local.mbtiles`. Look at the source code to `examples/download.py` to see how it works. If\nthere are problems with the download, just interrupt it with `Ctrl-C` and re-run it: the program will\nautomatically resume where it left off.\n\nOnce you have downloaded a few tiles, you can view them directly with `tc-viewer`:\n\n $ poetry run tc-viewer --root=4/8/5 local.mbtiles tiles.debug.black\n\nPoint your browser at <http://localhost:8080> as usual. The `--root` option to `tc-viewer` instructs the\nviewer to start at a defined tile, rather than at 0/0/0, so you don't have to zoom in to find the tiles that\nyou downloaded.\n\n## Changelog\n\n### 1.9.0\n\n- Add the following extra dependencies `azure`, `aws`, `wsgi`, `redis`, `all`.\n\n## Tile coordinates, tile layouts, tile grids and bounding pyramids\n\nTileCloud always represents tile coordinates as strings like `z/x/y`. TileCloud primarily works in tile\ncoordinates, although geographic coordinates can be used in some places.\n\nTile layouts convert tile coordinates to and from strings for use in paths, URLs, keys, etc.\n\nTile grids are used to convert tile coordinates to and from geographic coordinates, and to relate tiles with\ndifferent z values.\n\nBounding pyramids represent a range of tiles in the x, y and z directions. The format is basically\n`minz/minx/miny:maxz/maxx/maxy` but `maxz` is optional and `maxz`, `maxx` and `maxy` can be prefixed with an\n`+` sign to indicate that they are relative to the corresponding `min` value. This is probably best\ndemonstrated by a few examples:\n\n`4/10/20:15/25`\n\n: This corresponds to a range of tiles with z=4, x=10..15 and y=20..25\n\n`4/10/20:+5/+5`\n\n: This is the same range (z=4, x=10..15, y=20..25) but expressed using relative sizes.\n\n`4/10/20:5/15/20`\n\n: This is the same range of tiles above, but also includes all the tiles at level z=5 which overlap the\nabove range. TileCloud uses the tile grid to calculate which tiles from level z=5 to include.\n\n`4/10/20:+1/+5/+5`\n\n: This represents the range same as the previous example using a relative `maxz`.\n\n## Quick tile generation\n\nThe `tc-copy` command can be used to copy tiles between different TileStores. If a TileStore has the side\neffect of generating tiles, then it functions as a quick tile generation utility. First, some quick examples.\n\nTo convert from one tile format to another, just copy from source to destination. For example, to convert an\nMBTiles file in to a ZIP file, just run:\n\n $ poetry run tc-copy OSM-OpenCPN2-MagellanStrait.mbtiles geography-class.zip\n\nYou can check this worked with `unzip`:\n\n $ unzip -t geography-class.zip\n\nEqually, `tc-copy` can be used to download multiple tiles:\n\n $ poetry run tc-copy --bounding-pyramid 4/0/0:0/16/16 tiles.openstreetmap_org osm-up-to-z4.mbtiles\n\nHere we downloaded zoom levels 0 to 4 of the OpenStreetMap tiles into a local MBTiles file. The\n`--bounding-pyramid` option is required because otherwise we would download _all_ OpenStreetMap tiles -- which\nmight take some time (and also contravene OpenStreetMap's tile usage policy). Note that, by default, `tc-copy`\nwon't overwrite tiles if they already exist in the destination. This means that you can interrupt the above\ncommand and restart it, and it will resume where it was interrupted. If you want to overwrite tiles in the\ndestination then pass the `--overwrite` option to `tc-copy`.\n\nIn the same way, `tc-copy` can also be used to upload tiles. For example, to upload an MBTiles file to S3,\njust use:\n\n $ poetry run tc-copy osm-up-to-z4.mbtiles s3://bucket/prefix/%(z)d/%(x)d/%(y)d.jpg\n\n`bucket` is the name of your S3 bucket. You'll need to have set the `AWS_ACCESS_KEY_ID` and\n`AWS_SECRET_ACCESS_KEY` environment variables to have permission to upload to S3. The rest of the destination\n(`prefix/%(z)d/%(x)d/%(y)d.jpg`) is a template describing the layout of the tiles in S3. It's a normal Python\nformat string: `%(x)d` means substitute the tile's `x` coordinate as a decimal integer.\n\nYou can pass the same `s3://` URL to `tc-viewer`. This allows you to visualize your tiles stored in S3 with\nyour favorite mapping library. For example:\n\n $ poetry run tc-viewer s3://bucket/prefix/%(z)d/%(x)d/%(y)d.jpg\n\nHere, `tc-viewer` is acting as a proxy, serving tiles stored in S3 over HTTP, bypassing any caches or access\ncontrols (assuming you have the correct credentials, of course). This allows you to visualize the exact tiles\nthat you've stored.\n\n## Rendering the World\n\nAt [FOSS4G-NA](http://foss4g-na.org/), [MapBox](http://mapbox.com/) presented an excellent strategy for\n[rendering the world](http://mapbox.com/blog/rendering-the-world/). TileCloud supports the subdivision\nstrategy. To run the demo, execute:\n\n $ poetry run examples/renderingtheworld.py\n\nThis will generate tiles from a WMTS tile server and save them in a local MBTiles tiles. When the above\ncommand is complete, you can see the bounding pyramid of the generated tiles:\n\n $ poetry run tc-info -t bounding-pyramid -r medford_buildings.mbtiles\n 0/0/0:+1/+1\n 1/0/0:+1/+1\n 2/0/1:+1/+1\n 3/1/2:+1/+1\n 4/2/5:+1/+1\n 5/5/11:+1/+1\n 6/10/23:+1/+1\n 7/20/47:+1/+1\n 8/40/94:+2/+2\n 9/80/189:+2/+1\n 10/162/378:+1/+2\n 11/324/757:+2/+2\n 12/649/1514:+3/+3\n 13/1299/3028:+4/+5\n 14/2598/6057:+7/+8\n 15/5196/12114:+13/+15\n\nYou can look at these tiles (which show buildings in Medford, OR) with the command:\n\n ./tc-viewer --root=7/20/47 tiles.openstreetmap_org medford_buildings.mbtiles\n\n## A cheap-and-cheerful tile server\n\n`tc-viewer` can be used as a lightweight tile server, which can be useful for development, debugging and\noff-line demos. The TileStores passed as arguments to `tc-viewer` are available at the URL:\n\n http://localhost:8080/tiles/{index}/tiles/{z}/{x}/{y}\n\nwhere `{index}` is the index of the TileStore on the command line (starting from 0 for the first tile store),\nand `{z}`, `{x}` and `{y}` are the components of the tile coordinate. The second `tiles` in the URL is present\nto work around assumptions made by OpenWebGlobe. This layout is directly usable by most mapping libraries, see\nthe code in `tilecloud/views/*.tpl` for examples. The host and port can be set with the `--host` and `--port` command\nline options, respectively.\n\nNote that there is no file extension. `tc-viewer` will automatically set the correct content type and content\nencoding headers if it can determine them, and, failing this, most browsers will figure it out for themselves.\n\nFor convenience, `tc-viewer` serves everything in the `static` directory under the URL `/static`. This can be\nused to serve your favorite mapping library and/or application code directly for testing purposes.\n\nBy default, `tc-viewer` will use [Tornado](http://www.tornadoweb.org/) as a web server, if it is available,\notherwise it will fall back to [WSGIRef](http://docs.python.org/library/wsgiref.html). Tornado has reasonably\ngood performance, and is adequate for local development and off-line demos, especially when used with a\nMBTiles TileStore. WSGIRef has very poor performance (it handles only one request at a time) and as such can\nbe used as a \"slow\" tile server, ideal for debugging tile loading code or testing how your web application\nperforms over a slow network connection. `tc-viewer` is particularly slow when used to proxy tiles being\nserved by a remote server. You can set the server explicitly with the `--server` option.\n\n`tc-viewer` sets the `Access-Control-Allow-Origin` header to `*` for all the tiles it serves, this allows the\ntiles to be used as textures for WebGL applications running on different hosts/ports. For more information,\nsee [Cross-Domain Textures](https://developer.mozilla.org/en/WebGL/Cross-Domain_Textures).\n\n`tc-viewer` is designed as a development tool, and the power that it offers comes at the expense of fragility.\nIt makes many assumptions - including the benevolence of the user - that make it entirely unsuitable as a\ngeneric tile server. It should only be used in development or demonstration environments.\n\n## Comparing mapping libraries\n\n`tc-viewer` supports most popular web mapping libraries out-of-the box. This can be very useful for quick,\npractical comparisons. If your favorite mapping library is missing, please submit an\n[issue](https://github.com/camptocamp/tilecloud/issues), or, even better, a [pull\nrequest](https://github.com/camptocamp/tilecloud/pulls).\n\n## Contributing\n\nPlease report bugs and feature requests using the [GitHub issue\ntracker](https://github.com/camptocamp/tilecloud/issues).\n\nIf you'd like to contribute to TileCloud, please install the development requirements:\n\n $ pip install -r dev-requirements.txt\n\nTileCloud comes with unit tests in the `tilecloud/tests` directory. You can run these with the command:\n\n $ make test\n\nThis is equivalent to:\n\n $ python setup.py nosetests\n\nFor pull requests, it is very much appreciated if your code passes `prospector` without warnings. You can run\nprospector on the codebase with the command:\n\n $ make prospector\n\n## License\n\nCopyright (c) 2012, Tom Payne <twpayne@gmail.com> All rights reserved.\nCopyright (c) 2012, Camptocamp All rights reserved.\n\nRedistribution and use in source and binary forms, with or without modification, are permitted provided that\nthe following conditions are met:\n\n- Redistributions of source code must retain the above copyright notice, this list of conditions and the\n following disclaimer.\n- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the\n following disclaimer in the documentation and/or other materials provided with the distribution.\n\nTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND ANY EXPRESS OR IMPLIED\nWARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A\nPARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY\nDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,\nPROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER\nCAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR\nOTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH\nDAMAGE.\n\nvim: set filetype=rst spell spelllang=en textwidth=0:\n\n## Contributing\n\nInstall the pre-commit hooks:\n\n```bash\npip install pre-commit\npre-commit install --allow-missing-config\n```\n\n",
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