Inversion Techniques for Soil Moisture

1
Inversion Techniques for Soil Moisture
PASSIVE
2
SMv a1a2.ea3.e2 a4.e3a5.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
(No Transcript)
5
(No Transcript)
6
Mv -119.05 e 115.45
7
Vegetation Covered Soil
b is a constant and depends on crop type and
frequency W Vegetation water content g/m2
8
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
9
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
10
Aqua Satellite AMSR-E TB Data
11
(No Transcript)
12
(No Transcript)
13
Soil Moisture Estimation using Active Microwave
Data
ACTIVE
IEM Model (ERS-2 SAR Data, Cvv )
14
Empirical Retrieval Model (ENVISAT)
C-hh and C-vv

• Real part of Dielectric Constant
• h r.m.s. surface height

15
(No Transcript)
16
April 14, 1994
Oct. 5, 1994
Soil Roughness
Soil Moisture
Soil Roughness
Soil Moisture
17

• 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 00 incidence
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)
18
Soil Moisture Map, Oh et al.
Pauli RGB, West Bengal
20
0
March 7, 2007 April 22, 2007
19
Pauli RGB, Haryana Test Site
Soil Moisture Map, Oh et al.
Nov. 19, 2006
12
0
20
Rajasthan, Sawai Madhopur district Soil
Moisture Map
May 28, 2007
20
0
21
Punjab, Patiala and surroundings, Soil Moisture
Map
Nov. 19, 2006
20
0
22
Sprinkler Irrigation fields in SAR Image
23
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

24
Coastal Andhra Pradesh
25
A -barley B -wheat
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
Single Date classification accuracy
55 Multi-date (4 scenes) temporal data 90