radar_tools demo

The module radar_tools allows to access radar mosaics in various formats and process the data in different ways. Data from different sources is obtained transparently and various interpolation and filtering options are provided.

The radar mosaics are accessed via two functions:

• get_instantaneous for instantaneous reflectivity or precipitation rates

• get_accumulations for precipitation accumulations

These two functions are very similar, get_accumulations itself calling get_instantaeous repeatedly in order to construct accumulations on the fly.

This tutorial demonstrates the different operations that can be performed.

• Tutorial setup
• Get radar mosaics from different sources and file formats
  • Baltrad ODIM H5
  • MRMS precipitation rates in grib2 format
  • 4-km mosaics from URP
• Get the nearest radar data to a given date and time
• Get precipitation rates (in mm/h) from reflectivity (in dBZ)
• Apply a median filter to reduce speckle (noise)
• Interpolation to a different grid
  • Nearest neighbor
  • Average all inputs falling within a destination grid tile
  • Average all inputs within a radius
• On-the-fly computation of precipitation accumulations
• Reading in stage IV accumulations
  • Read one file and get lat/lon of the data grid
  • Read one file, interpolate to a different grid, convert to average precipitation rate
  • Construct accumulation from several files