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Examples of Formosat-2 data use: Nezer-Arcachon datasets Framework: Vegetation and environnement monitoring of agriculture and forest landscapes in Aquitaine under global change (climate, anthropogenic activities) Dominique Guyon, INRA Bordeaux, Unité EPHYSE. Formosat2/VENµS Users meeting

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slide1

Examples of Formosat-2 data use:

Nezer-Arcachon datasets

Framework:

Vegetation and environnement monitoring of agriculture and forest landscapes in Aquitaine under global change (climate, anthropogenic activities)

Dominique Guyon, INRA Bordeaux, Unité EPHYSE

Formosat2/VENµS Users meeting

CESBIO, Toulouse, January 12th 2010

slide2

Venµs, Formosat-2 : high spatial resolution + high repetitivity

-> separate immediate changes due to agricultural practices operating at field level from those due to natural environment (soil, climate).

-> complementary approaches:

- monitoring the seasonal/interannual changes of the remote sensing signal (e.g. NDVI, red-edge bands reflectance):

dating phenological stages,

dating and detecting agricultural activities (sowing, thinning out of leaves, harvest, felling…),

detecting events of climate accidents (storm), stress or early senescence

- mapping of vegetation based on seasonal changes during the whole year

- retrieval of the annual course of biophysical variables at plot scale : LAI, Fcover, faPAR

- assessing the information loss due to a scaling from local measurements to low resolution remote sensing time-series (e.g. VEGETATION or MODIS).

- coupling to process-based models: biomass production, crop yield, productivity, C and water fluxes

slide3

VENµS: Propositions de sites

UR EPHYSE (terrestrial ecosystems)

UMR EPOC (maritime ecosystems)

FORMOSAT2: Database KALIDEoS-Littoral / CNES

KALIDEOS-Littoral

3

1

2

1: NEZER (forest landscape) and BILOS (fluxes meas.)

2, 3: Watersheds of Bouron, Tagon

Some INRA’s sites:

slide4

FORMOSAT2:

- time-series

2008-2009

NEZER + Bilos

14/03/2008

21/08/2008

22/12/2008

 Storm on January 29

04/02/2009

29/05/2009

24/06/2009

16/06/2009

13/08/2009

07/09/2009

- after 2009?

Other landscape site?

Estimation of C and water fluxes

  • ►forest structure changes monitoring with VHR imagery
  • Programm ORFEO/Cnes, PhD 2010-2013?
  • Collaboration EGID-Univ. Bordeaux3
  • Nezer
  • Climate events and sylvicultural changes (thinning, felling)
  • application to map the 24th January 2009 windfall damages
  • ►Phenology monitoring
  • tree layer and understory vegetation
  • Bilos ; 2008-2009
  • Ground-based measurements of LAI and fAPAR,
  • Seasonal change of vegetation indices from Spot/VEGETATION
  • Formosat/VEGETATION: to be done
slide5

Forest structure changes monitoring with VHR imagery

Programm ORFEO/CNES

► mapping the 24th January 2009 windfall damages: First results

C.ORNY12, N.CHEHATA1, S.BOUKIR2, D.GUYON1, 2009

1 EGID-Université Bordeaux3, 2 INRA

Before the storm: 22/12/2008

After the storm: 04/02/2009

0

slide6

Methodology – overall framefrom algorithms in Orfeo Tool Box (CNES) / mean shift algorithm

Radiometric features extraction :

- Textural

- Temporal change

- Vegetation indices.

before and after storm

Segmentation -> areas with same changes

automatical binary classification

unsupervised classification

slide7

intact

damaged

1 km

Results: binary map of damages and validation

  • Confusion matrix :

Ground level

  • Satisfactory results:
    • Unsupervised classification
    • concentrated damages (MMU)
  • Errors :
    • No detection of damages in young stands
    • Difficult for plot edge (shadows and class limits)
    • false détection due to shadows moving
    • To be estimated for diffuse damages

satellite level

  • MMU = 5 pixels = 300m²
  • ->5 to 45 trees according to density