VanderSat Data Products Release Notes

Version 3.0: Champaign

Summary

The Champaign release improves X and C band soil moisture as well as the Teff (land surface temperature) product. For L-band only small changes have been made and in most cases there is little benefit in switching from V1 to V3 for L-Band. In addition, the product names have been extended to include satellite name and time/trajectory of overpass as an identifier. Changes in X and C band are significant and the signal is improved in all our tests. In general C and X band are closer to L-band compared to the V1 data.

Date:September 2019
Compatibility changes:
 File type changes (updated flagging, QF files), climatology change for X and C band soil moisture and VOD, bias/slope correction for Teff, new api names
Note:Because of the division between AMSR-E and AMSR-2 soil moisture as separate products data before 2012 and after 2012 needs two separate API calls to be retrieved.

Files

  • Data flags have been changed (see Flags data file description for LST, VOD and SM)
  • Data flags are now stored and served as uint16 files.
  • Product names include the satellite information (GMI, SMAP, AMSR2, AMSRE)
  • Product names include overpass/time information (ASC, DESC – Ascending, Descending)

Algorithm

  • Updated rainfall/snow detection and filtering at the footprint level (all bands)
  • Updated Teff corrections (Ka band)
  • Update parameters (LPRM) for soil moisture and VOD (C and X band)
  • Geometry fixes AMSR2 (C, X and Ka band after 2012)
  • Removed extrapolation of Ka band footprints near the edge of swaths

Product names

As of version 3.0 the satellite and the time of overpass (currently ASC and DESC for ascending and descending only) are part of the API product name by default. An explanation is given in Product naming convention. Be sure to switch to the new products as soon as possible als the old products will de deprecated and eventually support will end.

Old and new api names for several commonly products
Old name New name
SM-LN_V001_100 SM-SMAP-LN-DESC_V003_100
SM-C1N_V001_100 (pre 2012) SM-AMSRE-C1N-DESC_V003_100
SM-C1N_V001_100 (post 2012) SM-AMSR2-C1N-DESC_V003_100
Teff_V001_100 Teff-AMSR2-DESC_V003_100
Teff_V001_100 Teff-AMSRE-DESC_V003_100
INU-CLASSES_V001_10 INU-S1-CLASSES_V003_10

Version 2.0: Vijfhoek

Version 2.0 is a pre-release version for specific areas only

Version 1.0: Haarlem

Summary

The Haarlem release improves the soil moisture, VOD and LST products by including better RFI filtering and processing of the 36 Ghz data. In addition, an operational service of the Derived Root zone soil moisture (DRZSM) is introduced.

Date:January 2019
Compatability changes:
 File type changes, climatology change in RFI areas, new api names

Files

Algorithm

  • Updated RFI detection at the footprint level
  • Updated Ka-Band processing to remove spatial artifacts (visible in X and C Band soil moisture)
  • Improved intercalibration of AMSRE and AMSR2

Product names

As of version 1.0 the version number of the product is part of the API product name by default An explanation is given in Product naming convention. Be sure to switch to the new products as soon as possible als the old products will be deprecated and eventually support will end.

Old and new api names for several commonly products
Old name New name
SM-SHORT-100 SM-LN_V001_100
SM_C1N_100 SM-C1N_V001_100
SM_XN_100 SM-XN_V001_100
INU-CLASSES_C1_10 INU-CLASSES_V001_10

Version 0.9: Noordwijk

Summary

The Noordwijk release is the first operational release of VanderSat soilmoisture, VOD, LST and inundation.

Date:January 2018