# Radar

## Overview

The DWD provides several data products produced by radar for different 
[radar sites](https://opendata.dwd.de/weather/radar/sites/).
Those are not further explained as of their complexity. The DWD also offers 
[Radolan](https://www.dwd.de/DE/leistungen/radolan/radolan.html),
an advanced radar product with calibrated areal precipitation, and 
[Radvor](https://www.dwd.de/DE/leistungen/radvor/radvor.html), a
precipitation forecast based on radar. Further information on radar products can be
found their 
[radar products overview](https://www.dwd.de/DE/leistungen/radolan/produktuebersicht/radolan_produktuebersicht_pdf.pdf?__blob=publicationFile).

Radolan offers the user radar precipitation measurements that are calibrated with
ground based measurements. The data is offered in hourly and daily versions, both
being frequently updated for the recent version and data for each concluded year is
stored in the historical version. The daily version offers gliding sums of the last 24
hours while the hourly version offers hourly sums of precipitation. The precipitation
amount is given in 1/10 mm.