PLMR Calibration Valerio Paruscio Dr Jeff Walker University of Melbourne.

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Presentation transcript:

PLMR Calibration Valerio Paruscio Dr Jeff Walker University of Melbourne

Outline Admissible error in brightness temperature measurement Available data for calibration Calibration options and recommendation

Model Sensitivity Assessment How accurate has the Brightness Temperature measurement to be in order to have a Moisture content error less than 4%? Hypothesis: Roughness = 0.2 SS Albedo = 0.05 Soil Type = Silt clay loam

Variables: Moisture Content ( ) %v/%v Vegetation Water Content (0 3)kg/m 2 Soil Temperature ( )K Incidence Angle (0 40) Model Sensitivity Assessment How accurate has the Brightness Temperature measurement to be in order to have a Moisture content error less than 4%?

Graphs Tb sensitivity

H polarization error (K) V polarization error (K)

Critical scenarios High value of Vegetation Water Content High Incidence Angle Dry Soil Max Tb error permitted = Most common scenarios Low value of Vegetation Water Content Max Tb error permitted = Commonly Tb error up to 8K can be tolerated 4.7K (Hpol) 2.7K (Vpol) 2.2K (Hpol) 1.3K (Vpol)

Available data for calibration Box pre and post flight (~300K) actual measured

Available data for calibration Box pre and post flight (~300K) Sky pre and post flight (~5K) actual measured

Box and Sky Brightness Temperature Pre flight Box Pre flight Sky Post flight Sky Post flight Box

Available data for calibration Box pre and post flight (~300K) Sky pre and post flight (~5K) Water in flight (~110K) actual measured

Temperature and Conductivity spatial series

Temperature and Conductivity time series

Transect–Buoy data comparision

Week 1 Week 2 Week 3 Week 4 Thermal Infrared data over the lake Mon Tue Wed Thu Fri

Available data for calibration Box pre and post flight (~300K) Sky pre and post flight (~5K) Water in flight (~110K) Sky in flight (~5K) actual measured

Available data for calibration 1.Box pre flight (~300K) 2.Sky pre flight (~5K) 3.Water in flight (~110K) 4.Sky in flight (~5K) 5.Box post flight (~300K) 6.Sky post flight (~5K) actual measured

Calibration options 6 points (all) 4 points/2 points (box & sky from the ground) 3 points (box and water)

Calibration lines (6 beams, 2 polarizations)

Check the 4 pt calibration with water ponit H polV pol

Check the 3 pt calibration with in flight sky ponit V polH pol

Variation in Tb measurement passing from the 4 points cal to the 3 points cal

Time series of slope & offset (4 pts) From 4 pt

Variation in Tb measurement passing from the 4 points cal to the 2 points cal

Error using a unique 4 pt calibration instead of a daily one

Conclusion Recommendation this campaign V pol 4 pt daily H pol 4 pt daily (or unique) next campaign V pol 4 pt daily, 3 pt(?) H pol 4 pt/2 pt daily (or unique)