VEGETAZIONE

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VEGETAZIONE

• Fotosintesi
• Stress e deperimento
• Telerilevamento attivo e passivo

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Typical UV-excited fluorescence of vegetation
lexc. 308 nm
Counts (a.u.)
Wavelength (nm)
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Spettri Flidar sulla vegetazione
in-field measurement (RAISA Project 1990-95)
PPFD Phtosynthetic Photon Flux Density
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Fluorescenza e fotosintesi
in-field measurement (RAISA Project 1990-95)
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Forest Decline
In-field fluorescence lidar spectra on beech
trees ( Pian di Novello forest, Pistoia )
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Fluorescence lidar spectra heavy-metals
contaminated plants
LIF spectra on Posidonia Oceanica Del.
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Fluorescence lidar spectra heavy-metals
contaminated plants
Variations in the fluorescence bands
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Fluorescence lidar spectra heavy-metals
contaminated plants
(BG)/(RFR) index
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VegetationActive / Passive Spectra

• 2.4-nm spectral resolution
• 20-m distance from the target
• normalised

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VegetationPassive Spectra

• 1.2-nm spectral resolution
• 20-m distance from the target

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VegetationActive / Passive Spectra

• 0.1-nm spectral resolution
• 20-m distance from the target

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VegetationActive / Passive Spectra

• Leaf 1 - Leaf 2 fluorescence vs. time
• area values

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Hyperspectral fluorescence lidar imaging

• Experimental layout
• 20-m distance
• 2.5 cm spot
• 10 cm x 10 cm spatial res.

Intensity (a.u.)
Wavelength (nm)
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FLUORESCENCE LIDAR PROFILING

• Merging spectral and temporal resolution
• Water column physical and chemical parameters
  profiling

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FLIDAR-P main technical features

• Laser wavelength 355 nm
• Laser energy 8 mJ
• Laser repetition rate 15 Hz
• Telescope F/3
• Spectral resolution 6 nm / 2.8 nm
• Detector head PMT linear array
• Number of channels 32
• Detector spectral window 185-750nm
• Temporal resolution 1 ns
• Dynamics 9 bit
• Power requirements 2 kW
• Dimensions (hxwxd) 1mx1mx0.3m
• Weight 50 kg

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FLIDAR-P typical data with spectral and temporal
resolution
Raman signal (lexc355 nm) from a 135-cm high
water column
Intensity (a.u.)
Time (ns)
Wavelength (nm)
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FLIDAR-P validation

• Test measurements in the laboratory
• Raman signal from an artificial column of water
• Validation of the signal inversion algorithms
• Test measurements in the field under
  partially-controlled conditions
• Evaluation of the water total attenuation
  coefficient
• Spectrally-resolved profiles of the water column
  signal

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FLIDAR-P validation time-resolved data
1.8
1.6
1.4
1.2
1
Intensity (a.u.)
0.8
0.6
0.4
0.2
0
-0.2
30
35
40
45
50
55
60
65
70
75
Time (ns)
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FLIDAR-P validationsignal inversion method
Raman signal on a 135-cm high water column
Water total attenuation coefficient (Method I)
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FLIDAR-P validation measurements in the outdoor

• Pool in the outdoor used for the prototypes test
• Availability of a 25-m long water column
• Measurements for different column lengths
• Measurement of the water attenuation coefficient

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Measurements in the outdoorSpatially-resolved
lidar measurements
Raman signal for different lengths of the water
column
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Measurements in the outdoor Method II-based
signal inversion
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Measurements in the outdoor Total attenuation
coefficient of water
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FLIDAR-P testaboard the o/v URANIA
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Spectrally- and temporally-resolved FLIDAR-P
measurements

• Raman scattering of water column
• DOM fluorescence

Intensity (a.u.)
Wavelength (nm)
Time (ns)
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Spectrally- and temporally-resolved FLIDAR-P
measurements
Chlorophyll fluorescence
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Attenuation coefficient by means ofFLIDAR-P
measurements