The Sonian Forest Belgium

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The Sonian Forest Belgium
VALERI test site 2004
Piet Boekaerts - VUB/ETRO-IRIS
pkboekae_at_etro.vub.ac.be

• 
  VALERI workshop INRA/CSE
• 
  Avignon 10th March 2005

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Sonian Forest VALERI test site 2004

• Context - the HyVAL project
• Sonian Forest site description
• VALERI field campaign 21-23th June 2004
• HyVAL campaign 28th July 2004
• Objectives

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Context

• HyMAP project HyVAL
• Exploitation of HyMAP Hyperspectral measurements
  for the VALidation of SPOT data products
• Partners ETRO/IRIS - INRA/CSE
• Funding Belgian Science Policy STEREO
  programme
• Organisation VITO

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HyEurope 2004

DLR / HyVista corp. HyMAP Campaigns 18
countries May-August 2004
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Sonian Forest VALERI test site 2004

• Context - the HyVAL project
• Sonian Forest site description

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Sonian forest site description

Typical beech stands Fagus Sylvatica L.
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Sonian forest site description

Typical 200 years old 30-35 m
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Sonian Forest site description

• Interest for VALERI
• Monitoring Natura 2000 area, in fulfilment of the
  EC-Habitat Directive 92/43/EEG
• Area 4.383 ha (80 km2)
• Highly heterogeneous forest region
• Tree age
• Tree density gap fractions
• Understory

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Sonian forest site description

Heterogeneous tree age gap fraction - understory
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Sonian forest site description

Examplediverse understory
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Sonian Forest VALERI test site 2004

• Context - the HyVAL project
• Sonian Forest site description
• VALERI field campaign 21-23th June 2004

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VALERI field campaign

21-23th June 2004
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VALERI field campaign

• Sampling methodology VALERI
• Sampling grid 3 x 3 representative sites (9 km2)
• Digital sampling data
• Hemispheric images
• Up
• Down
• Directional images
• Up
• Down
• Panorama
• Total 3.300 image samples

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VALERI Hemispheric image data
Up

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VALERI Hemispheric image data
Down (1/2)

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VALERI Hemispheric image data
Down (2/2)

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VALERI ??

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VALERI Directional image data
Up

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VALERI Directional image data
Down

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VALERI field campaign (2)

• ASD contact probe samples
• leaf
• beech
• oak
• beech bark
• understory

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Sonian Forest VALERI test site 2004

• Context - the HyVAL project
• Sonian Forest site description
• VALERI field campaign 21-23th June 2004
• HyVAL campaign 28th July 2004

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HyMAP Instrument

VIS/NIR/SWIR12 400 - 2500 nm 126 channels 4-10
m ground resolution
Dornier 228 (DLR)
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HyVAL campaign

Altitude 3.230 m
Ground resolution 7 m
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Calibration black reference

ASD Pro Field Spectrometer (VITO)
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Calibration white reference

ASD FieldSpec Pro FR (VITO)
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Athmospheric correction

Microtops Sunphotometer - Ozone monitor (VITO)
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Data Processing

Level 0 raw data
Level 1 radiometric calibration
System corrections
PARGE
Level 2A geocoding
Level 2B atmospheric correction
ATCOR
Radiative Transfer Model Sunphotometer Ground
reflectance measurements DEM
THEMATIC EVALUATION
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HyVAL data set 5 strips

Geom/Atm. corrected
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HyVAL data set problem (1)

Strip 3
Across track intensity gradient !!
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HyMAP data set problem (2)

mosaic strip1-5
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Sonian Forest VALERI test site 2004

• Context - the HyVAL project
• Sonian Forest site description
• VALERI campaign 21-23th June 2004
• HyVAL campaign 28th July 2004
• Objectives

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HyVAL objectives (1/2)

• Sonian Forest test site VALERI
• Data input SPOT HYMAP - (PROBA-CHRIS)
• HyMAP/SPOT co-registration
• HyMAP spectral and spatial up-scaling (gradients
  ?)
• VALERI SPOT HyMAP
• Modeling of understory leaf probe ASD (gradients
  ?)

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HyVAL data set problem (3)
Proba - CHRIS multi-angular data
Verhaert / Redu (ESA)
Status unknown
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HyVAL objectives (2/2)

• Relation gap fraction and soil vegetation ?
• all necessary data available
• Hemispheric images (up) tree gaps
• VALERI processing chain -gt gap fractions
• Hemisheric images (down) vegetation parameters
• Chlorophyle indices ?

END