Digital Earth Africa Notebooks

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License: The code in this repository is licensed under the Apache License, Version 2.0. Digital Earth Africa data is licensed under the Creative Commons by Attribution 4.0 license.

Contact: If you need assistance with any of the Jupyter Notebooks or Python code in this repository, please post a question on the Open Data Cube Slack channel or on the GIS Stack Exchange using the open-data-cube tag (you can view previously asked questions here. If you would like to report an issue with this notebook, you can file one on the Github issues page

Citing DE Africa Notebooks: If you use any of the notebooks, code or tools in this repository in your work, please reference them using the following citation:

Krause, C., Dunn, B., Bishop-Taylor, R., Adams, C., Burton, C., Alger, M., Chua, S., Phillips, C., Newey, V., Kouzoubov, K., Leith, A., Ayers, D., Hicks, A., DEA Notebooks contributors 2021. Digital Earth Australia notebooks and tools repository. Geoscience Australia, Canberra. https://doi.org/10.26186/145234

The Digital Earth Africa Notebooks repository (deafrica-sandbox-notebooks) hosts Jupyter Notebooks, Python scripts and workflows for analysing Digital Earth Africa (DE Africa) satellite data and derived products. This documentation is designed to provide a guide to getting started with DE Africa, and to showcase the wide range of geospatial analyses that can be achieved using DE Africa data and open-source software including Open Data Cube and xarray.

The repository is based around the following directory structure (from simple to increasingly complex applications):

1. Beginners_guide: Introductory notebooks aimed at introducing Jupyter Notebooks and how to load, plot and interact with DE Africa data

2. Datasets: Notebooks introducing DE Africa's satellite datasets and derived products, including how to load each dataset and any special features of the data. Some external datasets that are useful for analysing and interpreting DE Africa products are also covered.

3. Frequently_used_code: A recipe book of simple code examples demonstrating how to perform common geospatial analysis tasks using DE Africa and open-source software

4. Real_world_examples: More complex workflows demonstrating how DE Africa can be used to address real-world problems

5. Use Cases: Notebooks in this collection are developed for specific use-cases of the Digital Earth Africa platform and may not run as seamlessly as notebooks in the other folders of this repository. Notebooks may contain less descriptive markdown, contain more complicated or bespoke analysis, and may take a long time to run. However, they contain useful analysis procedures and provide further examples for advanced users.

The supporting scripts and data for the notebooks are kept in the following directories:

• Tools: Python functions and algorithms developed to assist in analysing DE Africa data (e.g. loading data, plotting, spatial analysis, machine learning)

• Supplementary_data: Supplementary files required for the analyses above (e.g. images, rasters, shapefiles, training data)

Getting started with DE Africa Notebooks

To get started with using deafrica-sandbox-notebooks, visit the DE Africa Notebooks Wiki page. This page includes guides for getting started on the DE Africa Sandbox.

Once you're set up, the main option for interacting with deafrica-sandbox-notebooks and contributing back to the repository is through:

• DE Africa notebooks using Git: Git is a version-control software designed to help track changes to files and collaborate with multiple users on a project. Using git is the recommended workflow for working with deafrica-sandbox-notebooks as it makes it easy to stay up to date with the latest versions of functions and code, and makes it impossible to lose your work.

  • Refer to the repository's Guide to using DE Africa Notebooks with git wiki article. For a more detailed explanation suited to new Git users, see our Version Control with Git tutorial.

• Set up Git authentication tokens: Git requires multi-factor authentication when using the command line or API. Set up a personal access token by following instructions from the GitHub Docs.

Contributing to DE Africa Notebooks

Main and working branches

The deafrica-sandbox-notebooks repository uses 'branches' to manage individuals' notebooks, and to allow easy publishing of notebooks ready to be shared. There are two main types of branches:

• Main branch: The main branch contains DE Africa's collection of publicly available notebooks. The main branch is protected, and is only updated after new commits a reviewed and approved by the DE Africa team.
• Working branches: All other branches in the repository are working spaces for users of deafrica-sandbox-notebooks. They have a unique name (typically named after the user). The notebooks on these branches can be works-in-progress and do not need to be pretty or complete. By using a working branch, it is easy to use scripts and algorithms from deafrica-sandbox-notebooks in your own work, or share and collaborate on a working version of a notebook or code.

Publishing notebooks to the main branch

Once you have a notebook that is ready to be published on the main branch, you can submit a 'pull request' in the Pull requests tab at the top of the repository. The default pull request template contains a check-list to ensure that all main branch Jupyter notebooks are consistent and well-documented so they can be understood by future users, and rendered correctly. Please ensure that as many of these checklist items are complete as possible, or leave a comment in the pull request asking for help with any remaining checklist items.

Draft pull requests

For pull requests you would like help with or that are a work in progress, consider using Github's draft pull request feature. This indicates that your work is still a draft, allowing you to get feedback from other DE Africa users before it is published on the main branch.

DE Africa Notebooks template notebook

A template notebook has been developed to make it easier to create new notebooks that meet all the pull request checklist requirements. The template notebook contains a simple structure and useful general advice on writing and formatting Jupyter notebooks. The template can be found here: DEAfrica_notebooks_template.ipynb

Using the template is not required for working branch notebooks, but is highly recommended as it will make it much easier to publish any notebooks on main in the future.

Approving pull requests

Anyone with admin access to the deafrica-sandbox-notebooks repository can approve 'pull requests'.

If the notebook meets all the checklist requirements, click the green 'Review' button and click 'Approve' (with an optional comment). You can also 'Request changes' here if any of the checklist items are not complete.

Once the pull request has been approved, you can merge it into the main branch. Select the 'Squash and merge' option from the drop down menu to the right of the green 'merge' button. Once you have merged the new branch in, you need to delete the branch. There is a button on the page that asks you if you would like to delete the now merged branch. Select 'Yes' to delete it.

Update: The default branch has been renamed!

October 2021

master is now named main in line with GitHub recommended naming conventions.

If you have a local clone created before 29 October 2021, you can update it by running the following commands.

git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a