# PySTAC

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PySTAC is a library for working with the [SpatioTemporal Asset Catalog](https://stacspec.org) specification in Python 3.

## Installation

### Install from PyPi (recommended)

```shell
python -m pip install pystac
```

If you would like to enable the validation feature utilizing the
[jsonschema](https://pypi.org/project/jsonschema/) project, install with the optional
`validation` requirements:

```shell
python -m pip install 'pystac[validation]'
```

If you would like to use the [`orjson`](https://pypi.org/project/orjson/) instead of the
standard `json` library for JSON serialization/deserialization, install with the
optional `orjson` requirements:

```shell
python -m pip install 'pystac[orjson]'
```

If you would like to use a custom `RetryStacIO` class for automatically retrying
network requests when reading with PySTAC, or if you have non-ASCII characters in
your urls you'll need
[`urllib3`](https://urllib3.readthedocs.io/en/stable/):

```shell
python -m pip install 'pystac[urllib3]'
```

If you are using jupyter notebooks and want to enable pretty display of pystac
objects you'll need [`jinja2`](https://pypi.org/project/Jinja2/)

```shell
python -m pip install 'pystac[jinja2]'
```

### Install from source

```shell
git clone https://github.com/stac-utils/pystac.git
cd pystac
python -m pip install .
```

See the [installation page](https://pystac.readthedocs.io/en/latest/installation.html)
for more options.

## Versioning

The core PySTAC API follows [Semantic Versioning](https://semver.org/).
As of [Spring 2026](https://github.com/stac-utils/pystac/pull/1650), our [extension](https://stac-extensions.github.io/) implementations have moved to their own Python packages, so they can be versioned independently of the core PySTAC API.
Breaking changes to the API of extension packages are _not_ considered breaking changes for the purposes of PySTAC versioning.

The STAC extension packages' MAJOR and MINOR versions will match the version extension itself, e.g. **pystac-ext-projection** v2.0.0 corresponds to the [v2.0.0](https://github.com/stac-extensions/projection/releases/tag/v2.0.0) release of the **projection** extension.
Any changes to the software (not the extension) will be released via [PATCH releases](https://packaging.python.org/en/latest/discussions/versioning/#valid-version-numbers).

## Documentation

See the [documentation page](https://pystac.readthedocs.io/en/latest/) for the latest docs.

## Developing

See [contributing docs](https://pystac.readthedocs.io/en/latest/contributing.html)
for details on contributing to this project.

## Running the quickstart and tutorials

There is a quickstart and tutorials written as jupyter notebooks in the `docs/tutorials` folder.
To run the notebooks, run a jupyter notebook with the `docs` directory as the notebook directory:

```shell
jupyter notebook --ip 0.0.0.0 --port 8888 --notebook-dir=docs
```

You can then navigate to the notebooks and execute them.

Requires [Jupyter](https://jupyter.org/) be installed.