The German Weather Service (DWD) maintains ground based network of different instruments. One of these is the operational C-band Radar network. SAMD provides the data of the high level product RADOLAN, reflectivity and precipitation data on a regular grid, with 1x1km² horizontal and 5 minutes temporal resolution. Furthermore DWD provides cloud bottom heights from the ceilometer.
The GFZ German Research Centre for Geosciences in Potsdam operates a German wide ground-based GNSS atmosphere sounding network. GNSS stands for Global Navigation Satellite Systems. One of the products is the path of integrated water vapor, provided in SAMD.