SMOS soil moisture validation: status at the Upper
Danube cal/val site eight months after launch

SMOS cal/val proposal: A...
    Cal/val approach
    The Upper Danube Catchment cal/val site
    Overview campaigns and data
    Preliminary SMOS ...
Objectives


SMOS cal/val objectives

 Validate SMOS products
      Soil moisture (L2)
      Brightness temperatures (L...
Approach




                              2   1km
  1
                 validation




                                   ...
Approach



                                                                      „L1c Brightness
                        ...
Approach

                   • Two airborne campaigns
                   •Comparison with ancillary remote sensing
       ...
Upper Danube Catchment                                            Vils test site




                                     ...
Instrumentation Vils test site

Soil moisture
     •   Profile (5 probes per station:
         2x5,10,25,40cm )
          ...
Land surface modelling

2




Meteorological data from a           PROMET land surface model
dense network of in situ stat...
Model validation

PROMET model has been extensively validated and is still
  being validated regularly using in-situ data
...
ELBARA 2 radiometer

                                                                                          3




Meteo...
ELBARA 2 radiometer


Data of ELBARA available through a web client
(full access to instrument ancillary data)




IEEE In...
SMOS airborne campaigns
   Rehearsal campaign 2008
SMOS validation campaign 2010
SMOS cal/val campaigns




                                                           EMIRAD
                             ...
Radiometer data comparison 2008


                                                     EMIRAD minus HUT-2D after temperatu...
SMOS cal/val campaign 2010


   Five flights: 17, 22, 25 May,
    12, 17 June 2010

   Most overflights covered 10
    g...
SMOS cal/val campaign 2010


First data SMOS campaign 2010




      EMIRAD data on lake Chiemsee                    HUT-2...
SMOS cal/val campaign 2010




                                                                 Vils test site




TIR bri...
Field measurements 2010

Soil moisture
   60 points covering whole focus area (spacing ~ 500m)
   90 points covering sma...
Conditions during campaign

   Different soil moisture conditions between saturated and medium dry
   Vegetation growth ...
Dynamics of ground measurements

                                soil moisture ground measurements (coarse resolution grid...
Stations vs. spatial mean




          SM station




                       Ground station measurements
                ...
Brightness temperatures


L-MEB

  Radiative
  transfer
   model
                                                         ...
SMOS comparison
SMOS data UDC (Vils testsite)




Morning overpasses
SMOS data UDC (Vils testsite)
L1c comparison


Comparison of SMOS L1c Brightness temperatures with
  simulated brightness temperatures (coupled
  PROMET...
SMOS L1c vs. PROMET-LMEB

                                                                     Only morning overpasses (40...
Project status

                                                          „L1c Brightness
                                ...
Conclusions and outlook


 UDC cal/val activities on their way

 More detailed analysis of campaign data in the next mon...
Thanks!




Funded by German Aerospace
Center (50EE0731)
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FR1.L10.5: SMOS SOIL MOISTURE VALIDATION: STATUS AT THE UPPER DANUBE CAL/VAL SITE EIGHT MONTHS AFTER LAUNCH

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FR1.L10.5: SMOS SOIL MOISTURE VALIDATION: STATUS AT THE UPPER DANUBE CAL/VAL SITE EIGHT MONTHS AFTER LAUNCH

  1. 1. SMOS soil moisture validation: status at the Upper Danube cal/val site eight months after launch SMOS cal/val proposal: AO ID 3236 Johanna Dall‘Amico1, Alexander Löw2, Florian Schlenz1, Wolfram Mauser1 1University of Munich, Department of Geography, Munich, Germany 2Max-Planck-Institute for Meteorology, KlimaCampus, Hamburg, Germany Funded by German Aerospace Center (50EE0731)
  2. 2.  Cal/val approach  The Upper Danube Catchment cal/val site  Overview campaigns and data  Preliminary SMOS data analysis  Conclusions and outlook IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  3. 3. Objectives SMOS cal/val objectives  Validate SMOS products  Soil moisture (L2)  Brightness temperatures (L1c)  ... over  a large area (entire Upper Danube)  a smaller, but well instrumented area (Vils)  ... using  Field measurements  Large scale land surface modelling  Ancillary remote sensing data IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  4. 4. Approach 2 1km 1 validation Land surface Soil moisture SMOS Soil moisture station Model (PROMET) L2 SM product IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  5. 5. Approach „L1c Brightness temperature“ SMOS 3 L-MEB validation Radiative comparison Transfer model L2 Processor Radiometer 2 1km 1 validation API Land surface Soil moisture SMOS Soil moisture station model PROMET L2 SM product IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  6. 6. Approach • Two airborne campaigns •Comparison with ancillary remote sensing data: soil moisture product from ENVISAT „L1c Brightness ASAR (VISTA GmbH) SMOS temperature“ 3 L-MEB validation Radiative comparison Transfer model L2 Processor Radiometer 2 1km 1 validation API Land surface Soil moisture SMOS Soil moisture station model PROMET L2 SM product IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  7. 7. Upper Danube Catchment Vils test site Radiometer Size: 77000 km² IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  8. 8. Instrumentation Vils test site Soil moisture • Profile (5 probes per station: 2x5,10,25,40cm ) – TDR Probes (IMKO GmbH) – ECHO probes (Decagon) • Automatic data transmission • Start: 2007 (one station since 2002) Meteorological data • Precipitation • Longwave radiation • Temperature (2m) • Wind speed • Solar radiation 50 km • Relative humidity • Temperature @ 5,40 cm 1 IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  9. 9. Land surface modelling 2 Meteorological data from a PROMET land surface model dense network of in situ stations (NRT availability; subset shown) IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  10. 10. Model validation PROMET model has been extensively validated and is still being validated regularly using in-situ data IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  11. 11. ELBARA 2 radiometer 3 Meteorological data Rape Grassland IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  12. 12. ELBARA 2 radiometer Data of ELBARA available through a web client (full access to instrument ancillary data) IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  13. 13. SMOS airborne campaigns Rehearsal campaign 2008 SMOS validation campaign 2010
  14. 14. SMOS cal/val campaigns EMIRAD (Technical University of Denmark) Thermal camera (Max-Planck-Institute for Meteorology, Hamburg) HUT-2D radiometer (Aalto University, Helsinki)
  15. 15. Radiometer data comparison 2008 EMIRAD minus HUT-2D after temperature correction 30 20 10 Lochheim first stokes parameter [K] 0 Engersdorf -10 South Engersdorf -20 North Steinbeissen -30 South -40 Steinbeissen North -50 -60 08/04/2008 15/04/2008 flight days during rehearsal campaign 2008 Two complementary radiometers during SMOS airborne campaigns provide added value: - HUT-2D: imaging system, good spatial resolution - EMIRAD: better radiometric calibration IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  16. 16. SMOS cal/val campaign 2010  Five flights: 17, 22, 25 May, 12, 17 June 2010  Most overflights covered 10 ground stations and the ELBARA radiometer (white) and 5 focus areas (red)  Intensified ground campaign compared to 2008  Basic objective • Representative coverage of parts of one SMOS pixel IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  17. 17. SMOS cal/val campaign 2010 First data SMOS campaign 2010 EMIRAD data on lake Chiemsee HUT-2D data example (black areas: forest) IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  18. 18. SMOS cal/val campaign 2010 Vils test site TIR brightness temperatures (raw data) IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  19. 19. Field measurements 2010 Soil moisture  60 points covering whole focus area (spacing ~ 500m)  90 points covering smaller sub-area (spacing ~ 100 m)  =>~ 3000 SM measurements per day in the whole Vils Soil temperature Vegetation parameters  Height, phenology, biomass Land cover mapping IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  20. 20. Conditions during campaign  Different soil moisture conditions between saturated and medium dry  Vegetation growth phase  optical depth  Air temperature between 10 and 30°C Meteo data Neusling (014) 30 Flights 10 9 25 8 precipitation [mm] temperature [°C] 20 7 6 precipitation 15 5 air temperature 4 10 3 2 5 1 0 0 15.05.2010 00:00 16.05.2010 05:00 17.05.2010 10:00 18.05.2010 17:00 19.05.2010 22:00 21.05.2010 03:00 22.05.2010 08:00 23.05.2010 13:00 24.05.2010 18:00 25.05.2010 23:00 27.05.2010 04:00 28.05.2010 09:00 29.05.2010 14:00 30.05.2010 19:00 01.06.2010 00:00 02.06.2010 05:00 03.06.2010 10:00 04.06.2010 15:00 05.06.2010 20:00 IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  21. 21. Dynamics of ground measurements soil moisture ground measurements (coarse resolution grid) 45 40 soil moisture vol. %] 35 Lochheim 30 Engersdorf 25 Steinbeissen 20 Neusling Frieding 15 10 17.05. 22.05. 25.05. 28.05. 12.06. 14.06. 17.06. soil moisture ground measurements (high resolution grid) time 45 40 soil moisture vol. % 35 Engersdorf 30 Steinbeissen 25 Neusling 20 Frieding 15 10 17.05. 22.05. 25.05. 28.05. 12.06. 14.06. 17.06. date IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  22. 22. Stations vs. spatial mean SM station Ground station measurements (lines) and mean values of all measurements at red points (dots with standard deviation bars) IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  23. 23. Brightness temperatures L-MEB Radiative transfer model 290 Brightness temperature (TBh) [K] 280 270 260 250 EMIRAD 240 PROMET+LMEB 230 220 PROMET 210 soil moisture 200 17.5.10 27.5.10 6.6.10 16.6.10 Mean values and standard deviations of all values falling into the central ISEA grid point in the Vils area IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  24. 24. SMOS comparison
  25. 25. SMOS data UDC (Vils testsite) Morning overpasses
  26. 26. SMOS data UDC (Vils testsite)
  27. 27. L1c comparison Comparison of SMOS L1c Brightness temperatures with simulated brightness temperatures (coupled PROMET+LMEB) Actual SMOS L1c data processing: L-MEB • TB Filtering (Flags and additional) Radiative Transfer • Combining polarized observations model • Rotation (Faraday and Geometric) • Analysis per incidence angle PROMET soil moisture IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  28. 28. SMOS L1c vs. PROMET-LMEB Only morning overpasses (40°) Brightness temperature (TBh) [K] 17 April 2010 17 June 2010 IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  29. 29. Project status „L1c Brightness temperature“ SMOS   L-MEB validation Radiative comparison  Transfer  model L2 Processor Radiometer 1km validation    Soil moisture station  Surface state  Soil moisture API SMOS L2 SM product
  30. 30. Conclusions and outlook  UDC cal/val activities on their way  More detailed analysis of campaign data in the next months  More SMOS data analysis as soon as reprocessed L1c data and L2 data available IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
  31. 31. Thanks! Funded by German Aerospace Center (50EE0731)
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