climdata 0.1.3

This project automates the fetching and extraction of weather data from multiple sources — such as MSWX, DWD HYRAS, ERA5-Land, NASA-NEX-GDDP, and more — for a given location and time range.

climdata

This project automates the fetching and extraction of weather data from multiple sources — such as MSWX, DWD HYRAS, ERA5-Land, NASA-NEX-GDDP, and more — for a given location and time range.

• Free software: MIT License
• Documentation: https://Kaushikreddym.github.io/climdata

📦 Data Sources

This project utilizes climate and weather datasets from a variety of data sources:

• DWD Station Data
  Retrieved using the DWD API. Provides high-resolution observational data from Germany's national meteorological service.

• MSWX (Multi-Source Weather)
  Accessed via GloH2O's Google Drive. Combines multiple satellite and reanalysis datasets for global gridded weather variables.

• DWD HYRAS
  Downloaded from the DWD Open Data FTP Server. Offers gridded observational data for Central Europe, useful for hydrological applications.

• ERA5, ERA5-Land
  Accessed through the Google Earth Engine. Provides reanalysis datasets from ECMWF with high temporal and spatial resolution.

• NASA NEX-GDDP
  Also retrieved via Earth Engine. Downscaled CMIP5/CMIP6 climate projections developed by NASA for local-scale impact assessment.

• CMIP6
  Obtained using ESGPull from the ESGF data nodes. Includes multi-model climate simulations following various future scenarios.

It supports: ✅ Automatic file download (e.g., from Google Drive or online servers)
✅ Flexible configuration via config.yaml
✅ Time series extraction for a user-specified latitude/longitude
✅ Batch processing for many locations from a CSV file

🚀 How to Run and Explore Configurations

✅ Run a download job with custom overrides

You can run the data download script and override any configuration value directly in the command line using Hydra.

For example, to download ERA5-Land data for January 1–4, 2020, run:

python download_location.py dataset='era5-land' \
  time_range.start_date='2020-01-01' \
  time_range.end_date='2020-01-04' \
  location.lat=52.5200 \
  location.lon=13.4050

For downloading multiple locations from a csv file locations.csv, run:

python download_csv.py dataset='era5-land' \
  time_range.start_date='2020-01-01' \
  time_range.end_date='2020-01-04' \

an example locations.csv can be

lat,lon,city
52.5200,13.4050,berlin
48.1351,11.5820,munich
53.5511,9.9937,hamburg

What this does:

• dataset='era5-land' tells the script which dataset to use.
• time_range.start_date and time_range.end_date override the default dates in your YAML config.
• All other settings use your existing config.yaml in the conf folder.

---

✅ List all available datasets defined in your configuration

To see what datasets are available (without running the downloader), you can dump the resolved configuration and filter it using yq.

Run:

python download_location.py --cfg job | yq '.mappings | keys'

What this does:

• --cfg job tells Hydra to output the final resolved configuration and exit.
• | yq '.mappings | keys' filters the output to show only the dataset names defined under the mappings section.

---

⚡️ Tip

• Make sure yq is installed:

  brew install yq   # macOS
  # OR
  pip install yq
  

• To see available variables for a specific dataset (for example mswx), run:

  python download_location.py --cfg job | yq '.mappings.mswx.variables | keys'
  

---

---

⚙️ Key Features

• Supports multiple weather data providers
• Uses xarray for robust gridded data extraction
• Handles curvilinear and rectilinear grids
• Uses a Google Drive Service Account for secure downloads
• Easily reproducible runs using Hydra

---

📡 Google Drive API Setup

This project uses the Google Drive API with a Service Account to securely download weather data files from a shared Google Drive folder.

Follow these steps to set it up correctly:

---

✅ 1. Create a Google Cloud Project

• Go to Google Cloud Console.
• Click “Select Project” → “New Project”.
• Enter a project name (e.g. WeatherDataDownloader).
• Click “Create”.

---

✅ 2. Enable the Google Drive API

• In the left sidebar, go to APIs & Services → Library.
• Search for “Google Drive API”.
• Click it, then click “Enable”.

---

✅ 3. Create a Service Account

• Go to IAM & Admin → Service Accounts.
• Click “Create Service Account”.
• Enter a name (e.g. weather-downloader-sa).
• Click “Create and Continue”. You can skip assigning roles for read-only Drive access.
• Click “Done” to finish.

---

✅ 4. Create and Download a JSON Key

• After creating the Service Account, click on its email address to open its details.
• Go to the “Keys” tab.
• Click “Add Key” → “Create new key” → choose JSON → click “Create”.
• A .json key file will download automatically. Store it securely!

✅ 5. Store the JSON Key Securely

• Place the downloaded .json key in the conf folder with the name service.json.

Setup Instructions fro ERA5 api

1. CDS API Key Setup

1. Create a free account on the Copernicus Climate Data Store

2. Once logged in, go to your user profile

3. Click on the "Show API key" button

4. Create the file ~/.cdsapirc with the following content:

   url: https://cds.climate.copernicus.eu/api/v2
   key: <your-api-key-here>
   

5. Make sure the file has the correct permissions: chmod 600 ~/.cdsapirc