Google Earth Engine (GEE) Utilities

This project provides a few simple utility functions for interacting with GEE.

Authentication

To function properly, this code needs credentials that it can use to authenticate against the Google Earth Engine API. Credentials can be provided in one of two ways, and the code will look for them in this order:

1. Service Account Key.

Before running this code, create an environment variable named SERVICE_ACCOUNT_KEY containing the JSON key for a Google Cloud service account with the necessary permissions to perform the actions you're trying to perform in GEE.

2. Personal Credentials.

Before running this code, authenticate with the Google Earth Engine API using the earthengine command line tool:

$ earthengine authenticate

Development

This project uses Pipenv to manage virtual environments and dependencies. Development-time dependencies are documented in the Pipfile. Follow the Pipenv documentation to create a virtual environment and install the dependencies.

This project also uses pre-commit to run various Python code quality checks (linting and styling) on every commit. Before you begin any development work, install the pre-commit hook with:

$ pre-commit install

Makefile

The included Makefile prescribes actions to test, build, and publish this code to a Python Package Index (PyPI) repository as described in the following sections.

$ make [test | build | publish]

Testing

With the virtual environment active and the dependencies installed, use pytest to run the test suite.

Building

This project uses the setuptools Python package for packaging as described here.

When building via the make build command, you may optionally append to the package name using the prerelease argument. For example, if the current version of geeutils specified in the setup.py module is 1.2.3, then

$ make build prerelease=rc1

will produce a package named geeutils-1.2.3rc1. The default is a beta prerelease name incremented by each git commit (eg/ 1.2.3b7 for the seventh commit on this branch). Specify a final release with

$ make build prerelease=""

Note that prerelease names must comply with PEP 440.

Publishing

This project uses the twine Python package for distribution as described here.

When publishing via the make publish command, the default PyPI repository is testpypi. To publish to pypi.org, specify that repository:

$ make publish pypi_repository=pypi

The credentials necessary to publish to the target PyPI repository can be provided in one of two ways.

1. As these environment variables:

2. At the make publish command:

$ make publish pypi_repository_username="foo" pypi_repository_password="bar"