Shows a single day of New York taxi cab pickups
This example illustrates how to use Salt to generate PNG image output. Salt features used:
- Loading and using CSV data in Spark
- Count bin aggregator
- Min-max tile aggregator
- PNG image output format
- Saving results to local filesystem on Spark Master
To build the example you must first generate the PNG images data (written to the output/ directory) and then run the web app to view the results.
Tile generation is done using the code in the generation/ directory. If you plan on using the included Docker container to run the example, ensure that it's built before continuing (see root README).
Build the JAR and generate tiles in one command
salt-examples/png-example/ $ docker run --rm -v /$(pwd)/output:/opt/output -v /$(pwd)/generation:/opt/salt uncharted/salt-examples
To run the container interactively, run:
salt-examples/png-example/ $ docker run -it -v /$(pwd)/output:/opt/output -v /$(pwd)/generation:/opt/salt uncharted/salt-examples bash
Results are viewed through a simple web app contained in webapp/. After generating tiles, run from webapp/:
npm install
npm start
The application will be available at http://localhost:3000/