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Data Download (CCI SM v04.4)

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Data Download (ESA CCI SM v04.4)

This global ECV soil moisture data set has been generated using active and passive microwave spaceborne instruments and covers the (nearly) 40 year period from 1978 to 30.6.2018. The data set consists of three products: an active data set, a passive data set and a combined data set. It provides daily surface soil moisture with a spatial resolution of 0.25 degree.

The active data set is generated by the Vienna University of Vienna (TU Wien) based on observations from the C-band scatterometers on board of ERS-1, ERS-2 and MetOp-A and MetOp-B.

The passive data set is generated by Vandersat based on passive microwave observations from Nimbus 7 SMMR, DMSP SSM/I, TRMM TMI, Aqua AMSR-E, Coriolis WindSat, GCOM-W1 AMSR2, and SMOS.

ESA CCI SM v04.2 advanced the previous version (v03.3) by merging all active and passive L2 products directly to generate the COMBINED product (previously, this was created from the ACTIVE and PASSIVE products). In addition, soil moisture uncertainties are now available globally for all sensors except SMMR and spatial gaps in the triple collocation based SNR estimates are now filled using a polynomial SNR-VOD regression. Lastly, unreliable retrievals are masked before the merging of Level 2 products.

The latest version (v04.4) is based on the algorithm of v04.2 with the dataset being extended to 2018-06-30. There have also been some small changes necessitated by the unavailability of data streams used in the generation of v04.2. For more details, please see the change log provided with the data.More information about the ESA CCI SM v04.4 product can be found in

The active, passive and merged products are freely available after completion of a short registration. DOWNLOAD ESA CCI SM v04.4 at

If you are interested in previous product versions, please send us a request at


For further information please visit the Documents and Frequently Asked Questions section of this website.