Metop ASCAT Surface Soil Moisture - Climate Data Record v8 12.5 km sampling

• Type: data records
• Coverage: global
• Resolution: 25­-34 km x 25-­34 km, with sampling 12.5 km
• Accuracy
  • Threshold: Optimal Signal to noise ratio: 6 dB
• Dissemination: NetCDF following CF convention via FTP
• Timeliness: -
• Eumetsat Navigator URL: -
• DOI: 10.15770/EUM_SAF_H_0012

The ASCAT Surface Soil Moisture (SSM) products are based on the ASCAT Level 1b full-resolution product containing geo-located radar backscatter observation along each of the six ASCAT beams. The individual beam measurement is not collocated on a regular swath grid and therefore provided in their original observation geometry. The spatial resolution of the backscatter observation per beam varies slightly depending on the incidence angle, but is approximately 10 km (along-beam direction) x 25 km (across-beam direction. The full-resolution backscatter observation are resampled to a fixed Earth grid using a spatial filter (Hamming window) with a search radius of approximately 24 km. Resampled backscatter observation are merged into triplets (Fore, Mid, Aft beam) for overlapping beams. These backscatter triplets are used as input to the EUMETSATHSAF TUWien soil moisture retrieval algorithm, computing the ASCAT SSM product. The ASCAT SSM CDR v8 12.5 km product covers time period 2007-01-01 until 2024-08-31 including data from Metop-A, Metop-B and Metop-C.