The goal of TileCloud Chain is to provide tools around tile generation on a chain like:

Source: WMS, Mapnik.

Optionally using an SQS queue, AWS host, SNS topic.

Destination in WMTS layout, on S3, on Berkeley DB (bsddb), on MBTiles, or on local filesystem.

Features:

• Generate tiles.
• Drop empty tiles.
• Drop tiles outside a geometry or a bbox.
• Use MetaTiles.
• Generate the legend images.
• Generate GetCapabilities.
• Generate OpenLayers example page.
• Obtain the hash of an empty tile.
• In the future, measure tile generation speed.
• Calculate cost and generation time.
• In the future, manage the AWS hosts that generate tiles.
• Delete empty tiles.
• Copy files between caches.
• Be able to use an SQS queue to dispatch the generation.
• Post processing the generated tiles.
• ...

Legacy features:

• bsddb support
• sqlite (mbtiles) support
• mapnik support (should be updated for Python3)

Screenshot of the admin page with queue stored on PostgreSQL:

Create the config file tilegeneration/config.yaml see as example.

Only the latest release is supported and version < 1.11 contains security issues.

Build it:

git submodule update --recursive
python3 -m venv .build/venv
.build/venv/bin/pip install -r requirements.txt
.build/venv/bin/pip install -e .
.build/venv/bin/pip install -r dev-requirements.txt

.build/venv/bin/prospector

Setup your environment:

touch tilecloud_chain/OpenLayers.js
docker build --tag camptocamp/tilecloud-chain .
docker-compose -p tilecloud up

To run the tests:

docker-compose -p tilecloud exec test python setup.py nosetests --logging-filter=tilecloud,tilecloud_chain --attr '!'nopy3

As documentation you can read the USAGE.rst and the configuration reference.

You can add that in your workspace configuration to use the JSON schema:

{
  "yaml.schemas": {
    "../tilecloud-chain/tilecloud_chain/schema.json": [
      "tilecloud-chain/tilecloud_chain/tests/tilegeneration/*.yaml"
    ]
  }
}

Install the pre-commit hooks:

pip install pre-commit
pre-commit install --allow-missing-config