Snowmapper Tajikistan

This repository contains the code for the snowmapper tajikistan dashboard, currently available under taj.snowmapper.ch. The dashboard is a web application that displays snow cover data for Tajikistan. The data is sourced from the snowmapperForecast model implemented by Joel Fiddes.

Below we show a screenshot of the dashboard displaying a forecast of snow heigth:

Architecture

This project comes in 2 components: A data processor and a web interface. The data processor is a python script that downloads the latest snow data from the TopoPyScale and FSM model and, after pre-processing, stores it in local files optimized for display. The web interface is a dashboard that displays the snow-related data on a map. Both components are run in a docker container.

Data Processor

The data processor is a python script that downloads the latest snow data from the TopoPyScale and FSM model and stores it in local files optimized for display. The data processor is run as a cron job that runs every day around 21:00 UTC. It further removes the old data and keeps only the latest data on the server. Data processing can take several minutes, requires a stable internet connection, and a server with sufficient memory resources (we recommend at least 8 GB RAM).

Web Interface

The web interface is a web application that displays the snow-related data on a map. The web interface is built using the Holoviews and Bokeh libraries and the Panel dashboard library. It is run as a web server that serves the web application. The web interface is run as a docker container that is started when the server is started.

Deployment Instructions

Requirements

• Ubuntu 20.04 LTS
• Storage: 24 GB
• Memory: 8 GB
• Docker engine (Docker version 27.1.2 or higher) Installation instructions
• git (git version 243 or higher) (Installation: sudo apt-get install git)

Note: The installation of Docker Engine alone requires 2 GB, each docker image will require close to 2 GB and the caching of netCDF files will require another 2 GB of free storage.

Note: This implementation of the dashboard is configured with Nginx Proxy Manager for reverse proxy setup and SSL termination. If you want to deploy the dashboard under a diffent URL, you will need to edit the Dockerfile according to the instructions there and re-build the dashboard image. Alternatively you can manually configure Nginx reverse proxy on your server. Contact your IT department for help if you are not familiar with this.

Note: This repository assumes that you have access to a server instance running the operational snowmapperForecast model. Concretely you need to have access to the .pem file that allows you to download the snow data from the model.

Deployment steps

Clone GitHub repository

Clone the GitHub repository

git clone <repo-url>

Change to the repository directory

cd taj_snowmapper_dashboard

Set environment variables

Edit the .env file and set the required environment variables.

vi .env

Copy the .pem file to the server running the snowmapperForecast model operationally and set the path to the .pem file in the .env file relative to the folder /app/processing.

Configure language settings

The dashboard is currently configured to display strings in Russian language. However, you can change to English by editing the default_language variable in the config/config.base.yaml file and by editing the figure_title and units variables in the same file.

Pull and test-run the docker containers

This GitHub repository uses GitHub Actions to build docker containers and to upload them to DockerHub. To deploy the dashboard, you can now simply run a bash script that pulls the processing docker image and runs it in a container. From the root directory of the repository, run the following command:

bash run_data_processor.sh

This script will thake a few minutes to run. You can see if it was successful by checking the logs and the files in the data folder.

After editing the dashboard to run on your preferred url, you can test-run the web interface with the following docker pull and docker compose commands:

docker pull mabesa/taj-snowmapper-dashboard
docker compose up -d

Operationalize the data processor

Define regular cron jobs

crontab -e

Add the following line to the crontab file to periodically run the data processor at 21:09 UTC time which is around 2 o'clock in the moring in Dushanbe.

9 21 * * * bash ~/taj_snowmapper_dashboard/run_data_processor.sh >> ~/taj_snowmapper_dashboard/logs/crontab_processor.log 2>&1

And add the following line to the crontab file to periodically restart the web interface at 2:00 UTC

9 22 * * * docker restart taj-snowmapper-dashboard >> ~/taj_snowmapper_dashboard/logs/crontab_dashboard.log 2>&1