Planetary Computer Data Catalog

Note: This repository serves as a reference implementation for interacting with Planetary Computer APIs on Azure. Ths code supports the production deployment of the Planetary Computer Data Catalog and Explorer applications. This repository is not meant to be reusable in other situations without significant modification, and the repository maintainers cannot provide any support for non-development deployments of this code. Additionally, this application is under constant development, including some significant planned refactors.

That said, it is hoped that components or examples contained here will be helpful for users developing applications using the open-source components also used by the Planetary Computer, or against Planetary Computer APIs themselves. Please review the terms of use.

To file general issues or ask questions, please visit the Planetary Computer repository.

Data Catalog

A homepage, data catalog, and visualizations for the Planetary Computer.

Requirements

• Docker
• docker-compose

Getting started

The entire development environment is created as part of a multi-container docker-compose setup. To fetch and build the images, run:

./scripts/update

Now you can start the development server, and the site should be accessible at http://localhost:4280.

./scripts/server

If you want to run just the frontend development server on your host, ensure you have Node 14 installed and run:

yarn install
yarn start

To build the latest docs or external notebook, or if any new dependencies have been added, re-run ./scripts/update (you may need to refresh the app in your browser if the site was running).

Developing

There are four main components to the application:

1. etl - downloads and processes external files to be included in the application build
2. docs - a sphinx-powered, markdown based documentation system
3. api - an Azure Function app that provides a lightweight backend
4. src - the main React application, bootstrapped from Create React App

Frontend development

First, copy .env.sample file to .env, and ensure the configuration values are set.

Name	Value	Description
REACT_APP_API_ROOT	https://planetarycomputer-staging.microsoft.com	The root URL for the STAC API, either prod, staging or a local instance.
REACT_APP_TILER_ROOT	Optional	The root URL for the data tiler API, if not hosted from the domain of the STAC API.
REACT_APP_AZMAPS_KEY	Retrieve from Azure Portal	The key used to authenticate the Azure Maps inset map on a dataset detail page.
REACT_APP_HUB_URL	Optional. URL to root Hub instance	Used to enable a request to launch the Hub with a specific git hosted file.
REACT_APP_ONEDS_TENANT_KEY	Lookup at https://1dswhitelisting.azurewebsites.net/	Telemetry key (not needed for dev)

Run ./scripts/server to launch a development server.

Developing against local STAC assets

The REACT_APP_API_ROOT can be set to a local instance of the Metadata API if you are prototyping changes to collections. However, as a shortcut, you can also run the ./scripts/mockstac script in order to locally serve a static json file from /mockstac/collections. Simply alter the contents of the JSON file as you need, and set your REACT_APP_API_ROOT value to http://localhost:8866 and restart your dev server.

Feature flags

A simple feature flag system is included in the application. To add a flagged feature during development:

1. Wrap the component to be shown or hidden with a Feature component, providing a name.
2. In /utils/featureFlags.js add an object to the list with name, description, and active (bool)
3. Use the script in /extra/ff-bookmarklet.js to toggle features on a running site
   1. Use a JS minifier like https://javascript-minifier.com/ to minimize the file
   2. Add a new bookmark, and paste the minified JS as the URL. You'll likely need add the javascript: label back to the front of the screen.
4. Toggle feature flags on or off. Be sure that the site works in both states.
5. Remove the Feature component and the flag entry when the feature is mature enough to be included.

API development

To debug or extend the small API backend, please read the API README.

Testing and linting

The project contains cypress end-to-end tests and jest based unit tests.

To run jest based unit test and perform linting, run ./scripts/test.

Cypress

If you're on WSL2, be sure to set up your system to run the Cypress GUI: https://wilcovanes.ch/articles/setting-up-the-cypress-gui-in-wsl2-ubuntu-for-windows-10/

• Install Google Chrome in your WSL2 environment (Cypress ships with a chromium-based electron browser)
• Run yarn cypress:open to run the GUI and debug tests, or
• Run yarn cypress:run to run the headless version in the terminal

Both test suites are run from CI.

Ports

Service	Port
Webpack Dev Server	3000
Functions App Dev Server	7071
Mock STAC API Server	8866

Scripts

Name	Description
clean	Removes intermediate build files from docs and dataset codefiles
mockstac	Serves contents of /mockstac/collections at http://localhost:8866
server	Runs frontend development server
test	Runs unit tests and linter
update	Install dependencies and build etl and docs content. Use --devdocs to develop against a local notebook repo.
yarn *	Run configured yarn commands like yarn add, yarn lint, yarn test, etc

Deploying

There are 3 Azure Static Web App services enabled, for staging, test and production. They are configured via the GitHub workflow files. Generally, merging to deployment branches will initiate a build and deploy with the service framework:

• develop: Deploys to staging and test (pc-datacatalog, pc-datacatalog-test)
• main: Deploys to production (pc-datacatalog-production)

Opening a PR against either branch will also create an ephemeral staging environment, and a site link will be added to the PR comment section.

The release process can be managed with git flow, initialized with the default settings. To bring forth a production release, pull local develop and main to latest, and follow these steps:

• Start a release

git flow release start X.Y.Z

• Bump the version number in package.json and check it in

git status # check staging area is clean
git add package.json
git commit -m "X.Y.Z"

• Publish the release

git flow release publish X.Y.Z

• Finish and push the release branch
  • When prompted, keep default commit messages
  • Use X.Y.Z as the tag message

git flow release finish -p X.Y.Z

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Trademarks

This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft's Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party's policies.