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Inversion Techniques for Soil Moisture

Inversion Techniques for Soil Moisture. PASSIVE. SM v = a 1 +a 2 .e+a 3 .e 2 +a 4 .e 3 +a 5 .e 4. Surface Roughness.  X-band C-band L-

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Inversion Techniques for Soil Moisture

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  1. Inversion Techniques for Soil Moisture PASSIVE

  2. SMv = a1+a2.e+a3.e2 +a4.e3+a5.e4

  3. Surface Roughness  X-band C-band L- 0.05 smooth smooth smooth 0.5 rough interm. smooth 1.5 rough rough interm. 10.0 rough rough rough

  4. %Mv = -119.05 e + 115.45

  5. Vegetation Covered Soil b is a constant and depends on crop type and frequency W – Vegetation water content g/m2

  6. Soil Moisture Estimation using Passive Microwave Data Tbi – Observed Brightness Temperature at 6.6, 10.7 and 18 GHz (HH, VV polarizations) i – Calculated TB values  - Measurement noise Standard deviation for each channel

  7. Soil Moisture Estimation using Passive Microwave Data Tbi – Observed Brightness Temperature at 6.6, 10.7 and 18 GHz (HH, VV polarizations) i – Calculated TB values  - Measurement noise Standard deviation for each channel me – soil moisture, We vegetation water content, Te-temperature, qv- atmosphere water vapor

  8. Aqua Satellite AMSR-E TB Data

  9. Soil Moisture Estimation using Active Microwave Data ACTIVE IEM Model (ERS-2 SAR Data, Cvv )

  10. Empirical Retrieval Model (ENVISAT) C-hh and C-vv • = Real part of Dielectric Constant h = r.m.s. surface height

  11. April 14, 1994 Oct. 5, 1994 Soil Roughness Soil Moisture Soil Roughness Soil Moisture

  12. Oh et al. Semi-empirical Model (1992) Needs fully polarimetric Data (HH, VV and HV) for taking ratios Valid L to X-band with incidence angle range 10 to 700. Where 0 Fresnel reflectivity at 00incidence angle These equations are inverted for the calculation of dielectric constant ’and ks (surface roughness) The relation between dielectric constant and volumetric soil moisture (Topp et al. 1980)

  13. Soil Moisture Map, Oh et al. Pauli RGB, West Bengal 20% 0 March 7, 2007 April 22, 2007

  14. Pauli RGB, Haryana Test Site Soil Moisture Map, Oh et al. Nov. 19, 2006 Jhajjar Rewari 12% 0

  15. Rajasthan, Sawai Madhopur district Soil Moisture Map May 28, 2007 20% 0

  16. Punjab, Patiala and surroundings, Soil Moisture Map Nov. 19, 2006 20% 0

  17. Sprinkler Irrigation fields in SAR Image

  18. Agriculture Applications • Vegetation Parameters • Plant Height, Cover, Density • Lear Area Index • Plant Biomass/Water Content • Plant Row Direction • Growth Stage • Canopy Structure • Soil Parameters • Soil Moisture • Soil Roughness • Tillage Direction

  19. Coastal Andhra Pradesh

  20. A -barley B -wheat

  21. Single Date classification accuracy = 55% Multi-date (4 scenes) temporal data = 90%

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