Important

Due to an update on the CHMI website, these scripts no longer work. They will be removed soon, after the associated QGIS plugin has been updated accordingly. Please use this link to acquire meteorological data up to 2023.

CHMI – Meteorological Data

Copyright (C) 2025 Mikuláš Kadečka – [email protected]

All of the included scripts, accessible from the root directory, are used to download and process meteorological data files from the webpage of the Czech Hydrometeorological Institute. The programs must be run in the order listed below!

The programs and their descriptions are as follows:

1. web_scraping – main.py

   • Downloads all meteorological files from the CHMI dynamic webpage.
   • Stores them in the "DATA_CHMU" folder, which will be located in the root directory, maintaining the same folder structure as on the CHMI webpage.
   • Approximately 6,500 files (1.1 GB) will be downloaded, and the script takes roughly 3 hours to run.

2. data_processing – unzip.py

   • Extracts all downloaded meteorological files in the "DATA_CHMU" directory while preserving the folder hierarchy.

3. data_processing – preparation.py

   • Extracts all useful information from the meteorological files and stores it in the "output" folder, which will be located in the root directory.
   • The original folder structure is simplified.
   • Creates category folders and stores station files (will be used to create a point layer) and measurement files (tables containing measurements, linked to stations through their name and fileID in the station file).

4. data_processing – transformation.py

   • Converts all files in the "output" directory to GPKG format and saves them in the "spatial_data" directory.
   • Corrects the attribute data types.
   • This program is intended to be run in the QGIS application (requires the Processing plugin and additional functionalities).

Dependencies

Use the package manager pip to install dependencies.

pip install selenium
pip install undetected-chromedriver
pip install zipfile36