Remote Sensing of Soil Properties@ National and Regional Scales

Alan Marks

CSIRO Land and Water

Monday 22 Sept., 2008

Water for a Healthy Country

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Modellers’ Wish List …..

• Spatially-varying maps of:

• Ksat• Wilting point and field capacity SMC• Soil Porosity• Soil Layer Depth• Soil Bulk Density• % Clay, % Sand

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Problems associated with polygon soil properties

Modelled LST for field capacity SMC

NOAA-18 AVHRR LST 2005-10-02

LST(K)

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10 Sandy soil

1 Sandy-loam soil0.50 Clay-loam soil0.34 Unknown, set to loam

0.05 Clay or silty-clay soil

Water body

Grass

Shrub

Tree

Vegetation Properties

Physical parameterscanopy height, leaf width, …

Micrometeorological parametersreference height, zero plane displacement,

roughness length, …Physiological parameters

maximum stomatal conductance, fraction root biomass, …

Soil Properties

Hydrological parametersSaturation hydraulic conductivity, Min/max soil moisture content, …

Compositionporosity, %clay & % sand, …

Physical propertieslayer depth, …

Soil texture classification

Land cover classification

7.0

0.0

3.5

LAI

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Current Approach

• Active/Passive microwave, dry-down curve analysis

• MTSAT thermal inertia and dry-down curves

• Optical Remote Sensing for clay/sand mapping

• Airborne Gamma-Ray Spectrometry (Radiometrics)

• Cal/Val. NAFE, PGNA ……

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Collaboration with Mario Ferri, Landgate

teASM

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2eeeeeeeeeeeeeeeeweek 3eeeeeeeeeeeeeweek

4e222222

138.0

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Decay Curve Values

POS LAT LON A t half

(days)r2

5 -26.096 116.613 97.7 0.058 ~ 12 0.93

6 -26.096 116.873 126.4 0.091 ~ 7.5 0.94

7 -26.096 117.133 148.5 0.114 ~ 6 0.94

8 -26.096 117.393 170.2 0.137 ~ 5 0.98

9 -26.096 117.653 180.7 0.137 ~ 5 0.97

10 -26.096 117.913 185.7 0.138 ~ 5 0.96

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MTSAT – Thermal Inertia – Mario Ferri

• Monitoring soil moisture at 4km spatial resolution or better

• Based on Apparent Thermal Inertia (ATI): based on logic that water bodies have higher thermal inertia than dry soils

• Interested in looking at dry-down curve approach with this data

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Soil Moisture Saturation Index (MTSAT)

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Optical Remote Sensing – Clay/Sand Cudahy/Hewson CSIRO

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Radiometrics & DEM Analysis

Radiometric image of NSW with ASRIS soil polygons

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Calibration/Validation ... Scaling

• Cal/Val is a necessity for these products

• Possible data fusion of higher resolution data and attributes

• Ground truthing and scaling

• NAFE/OzNet data

• From point to transect - PGNA