The DWD provides several data products produced by radar for different radar sites. Those are not further explained as of their complexity. The DWD also offers Radolan, an advanced radar product with calibrated areal precipitation, and Radvor, a precipitation forecast based on radar. Further information on radar products can be found their radar products overview.
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.