STAC Catalog Populator

This repository contains a framework STACpopulator that can be used to implement concrete populators (see implementations) for populating the STAC Catalog, Collections and Items from various dataset/catalog sources, and pushed using STAC API on a server node.

Framework

The framework is centered around a Python Abstract Base Class: STACpopulatorBase that implements all the logic for populating a STAC catalog. This class provides abstract methods that should be overridden by implementations that contain all the logic for constructing the STAC representation for an item in the collection that is to be processed.

Implementations

Provided implementations of STACpopulatorBase:

Implementation	Description
CMIP6_UofT	Crawls a THREDDS Catalog for CMIP6 NCML-annotated NetCDF references to publish corresponding STAC Collection and Items.
DirectoryLoader	Crawls a subdirectory hierarchy of pre-generated STAC Collections and Items to publish to a STAC API endpoint.

Installation and Execution

Either with Python directly (in an environment of your choosing):

pip install .
# OR
make install

With development packages:

pip install .[dev]
# OR
make install-dev

You should then be able to call the STAC populator CLI with following commands:

# obtain the installed version of the STAC populator
stac-popultaor --version

# obtain general help about available commands
stac-popultaor --help

# obtain general help about available STAC populator implementations
stac-popultaor run --help

# obtain help specifically for the execution of a STAC populator implementation
stac-popultaor run [implementation] --help

You can also employ the pre-built Docker, which can be called as follows, where [command] corresponds to any of the above example operations.

docker run -ti ghcr.io/crim-ca/stac-populator:0.6.0 [command]

Note:
If files needs to provided as input or obtained as output for using a command with docker, you will need to either mount files individually or mount a workspace directory using -v {local-path}:{docker-path} inside the Docker container to make them accessible to the command.

Testing

The provided docker-compose configuration file can be used to launch a test STAC server. Consider using make docker-start to start this server, and make docker-stop to stop it. Alternatively, you can also use your own STAC server accessible from any remote location.

To run the STAC populator, follow the steps from Installation and Execution.

Alternatively, you can call the relevant populator Python scripts individually. For example, using the CMIP6_UofT implementation, the script can be run as:

python STACpopulator/implementations/CMIP6_UofT/add_CMIP6.py \
    "http://localhost:8880/stac/" \
    "https://pavics.ouranos.ca/twitcher/ows/proxy/thredds/catalog/birdhouse/testdata/xclim/cmip6/catalog.html" \
    "STACpopulator/implementations/CMIP6_UofT/collection_config.yml"

Note:
In the script above, a sample THREDDS catalog URL is employed and not one relevant to the global scale CMIP6 data.

For more tests validation, you can also run the test suite with coverage analysis.

make test-cov