GeOrchestrator

This project was developed as a part of PhD study. This project allows running geospatial workflows on serverless services provided by a cloud provider. It supports sequential, parallel, and loop executions. In addition, a new workflow and task definition models were introduced to design workflows in a simple, versionable, and readable way.

Usage

At the moment, it only works on AWS and local docker deployment. Other platforms are welcomed as pull requests.

AWS Deployment

The project uses Pulumi for infrastructure as code (IaC) to deploy resources on AWS. Follow these steps to deploy the application:

1. Install Pulumi:

   • For Windows (PowerShell): powershell winget install Pulumi
   • For macOS (Homebrew): bash brew install pulumi
   • For Linux: bash curl -fsSL https://get.pulumi.com | sh

2. Configure AWS credentials:

   • Install and configure AWS CLI
   • Run aws configure and enter your AWS credentials
   • Ensure you have appropriate permissions for creating resources

3. Deploy the infrastructure: Navigate to the deployment directory and run the deployment script: powershell cd ./deployments/GEOrchestrator.Aws.Deployment ./Deploy.ps1

This will create the following AWS resources: - Lambda functions for API endpoints - DynamoDB tables (on-demand) - Fargate cluster with required network components - API Gateway - S3 buckets for workflow storage

The deployment script will output the API endpoint URL once completed.

Docker Deployment

Under the root folder, run the following command to start the application:

bash docker compose up -d --build

The application will use default configuration values. If you need to customize the configuration, you can modify the environment variables in the docker-compose.yml file.

The API will be started on: http://localhost:8000

Example: Running Raster Calculations

The raster calculations workflow is provided as an example to demonstrate how the system works. It shows how to define, build, and execute a workflow using the GEOrchestrator system.

To run the example raster calculations workflow:

1. Make sure you are in the root folder of the project and run the build script:

For PowerShell: powershell ./definitions/raster-calculations/build_and_run.ps1

For bash: bash chmod +x ./definitions/raster-calculations/build_and_run.sh ./definitions/raster-calculations/build_and_run.sh

1. Once the workflow is created, you can execute it using cURL (for bash) or PowerShell. Here's an example of executing a reprojection workflow:

For bash: bash curl --location 'http://localhost:8000/processes/ReprojectDemsParallel/execution' \ --header 'Content-Type: application/json' \ --data '{ "inputs": { "dems": "[\"https://geo-public-assets.s3.eu-west-1.amazonaws.com/asciis/sample_1.asc\",\"https://geo-public-assets.s3.eu-west-1.amazonaws.com/asciis/sample_2.asc\"]", "source_projection": "EPSG:4326", "target_projection": "EPSG:3759" } }'

For PowerShell: ```powershell $body = @{ inputs = @{ dems = '["https://geo-public-assets.s3.eu-west-1.amazonaws.com/asciis/sample1.asc","https://geo-public-assets.s3.eu-west-1.amazonaws.com/asciis/sample2.asc"]' sourceprojection = 'EPSG:4326' targetprojection = 'EPSG:3759' } } | ConvertTo-Json

Invoke-RestMethod -Uri 'http://localhost:8000/processes/ReprojectDemsParallel/execution' -Method Post -ContentType 'application/json' -Body $body ``

This example demonstrates how to execute a parallel DEM reprojection workflow. Adjust the inputs according to your specific workflow requirements.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Publications

Pakdil, M.E.; Celik, R.N. Serverless Geospatial Data Processing Workflow System Design. ISPRS Int. J. Geo-Inf. 2022, 11, 20. https://doi.org/10.3390/ijgi11010020

License

Apache License 2.0