Etude des séries temporelles

1. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
Pauline DUSSEUX
EXPLOITATION DE SÉRIES TEMPORELLES D’IMAGES SATELLITES
À HAUTE RÉSOLUTION SPATIALE
POUR LE SUIVI DE L’OCCUPATION DES SOLS

2. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
LETG-Rennes
COSTEL LETG-Angers
LEESA
LETG-Caen
Géophen
LETG-Nantes
Géolittomer
LETG-Brest
Géomer

3. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CONTEXTE
Economic
interest
Grasslands
Environmental
interest
Culture forêt
Culture prairie
Forêt culture
Prairie culture
Prairies permanentes
Prairies temporaires
Maïs ensilageAutres
Decrease
Change in their
management

4. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CONTEXTE

5. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CONTEXTE

6. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CONTEXTE
SPOT 6 & 7

7. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CONTEXTE
SPOT 6 & 7
Which data ?
Which parameters ?
Which methodology ?

8. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
OBJECTIFS
Identification and characterization of grassland using time series of remotely
sensed data at high spatial resolution
Evaluate parameters derived from time series of remotely sensed data for grassland
monitoring
Develop a method to discriminate between grasslands and crops
Develop a method to map grassland management practices

9. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
SITE D’ÉTUDE
Yar watershed
Central-north Brittany, West France
61.5 km²
Agricultural dominance: UAA = 60%
(Grasslands = 65%, Crops = 35%)
Intensive farming
Mainly oriented towards cattle production
Grassland
Winter wheat
Water
Maize
Forest
Urban area

10. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
LES PRAIRIES
Grazing Mowing
Mixed

11. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
LES DONNÉES
2006
2010
2011
Remote Sensing data
Three time series of high spatial
resolution optical images
Two time series of high spatial
resolution SAR images

12. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
LES DONNÉES
Remote Sensing data
J
M
O
F
J
A
N
M
J
A
D
S
Vegetation indices (NDVI)
Biophysical variables (LAI, fCOVER)
Backscattering coefficient
Polarimetric parameters
Temporal profiles:
Informative on land cover,
vegetation growth,
phenological stages,
biomass,
agricultural practices…
Optical time series
(SPOT, Quickbird…)
SAR time series
(Radarsat-2)

13. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
LES DONNÉES
Ground measurements
Global & vertical photography of the field
Land cover
Agricultural practices
Spectral measurements
Digital hemispherical photography (DHP)
Biomass measurements

14. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
SVM classification technique
Euclidean matching Dynamic Time Warping matching

15. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION

16. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
Grassland identification
K= 0.91 K= 0.81 K= 0.83
SVM
Euclidean matching
SVM
DTW matching
K>0.8
K<0.8
Winter wheat (1) Maize (2)
Grassland (3)
2006 2010 2011

17. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
Grassland management identification
SVM
Euclidean matching
SVM
DTW matching
K>0.8
K<0.8
2006 2010 2011
K= 0.54 K= 0.54 K= 0.45
Grazing (1)
Mowing (2)
Mixed (3)
Dusseux P., Gong X., Hubert-Moy L., Corpetti T.,
Identification of grassland management practices from leaf
area index time series. Journal of Applied Remote Sensing,
8(1), 083559, doi:10.1117/1.JRS.8.083559, 2014.

18. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
Grassland management identification
SVM
Euclidean matching
SVM
DTW matching
K>0.8
K<0.8
2006 2010 2011
K= 0.82 K= 0.75 K= 0.75
Grazing (1)
Mowing (2)
Mixed (3)
+ 30% + 30%+ 20%
Dusseux P., Gong X., Hubert-Moy L., Corpetti T.,
Identification of grassland management practices from leaf
area index time series. Journal of Applied Remote Sensing,
8(1), 083559, doi:10.1117/1.JRS.8.083559, 2014.

19. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
Grassland management identification
SVM
Euclidean matching
SVM
DTW matching
K>0.8
K<0.8
Grazing (1) Mowing (2) Mixed (3)
Simulated data
Dusseux P., Gong X., Hubert-Moy L., Corpetti T.,
Identification of grassland management practices from leaf
area index time series. Journal of Applied Remote Sensing,
8(1), 083559, doi:10.1117/1.JRS.8.083559, 2014.
Dusseux P., Zhao Y., Cordier M.O., Corpetti T., Gascuel-
Odoux C., Hubert-Moy L., Simulation of grassland
management at the farm scale using PaturMata model.
Agronomy for Sustainable Development, in revision.

20. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
Grassland management identification
SVM
Euclidean matching
SVM
DTW matching
K>0.8
K<0.8
K= 0.24
Grazing (1) Mowing (2) Mixed (3)
Simulated data
Dusseux P., Gong X., Hubert-Moy L., Corpetti T.,
Identification of grassland management practices from leaf
area index time series. Journal of Applied Remote Sensing,
8(1), 083559, doi:10.1117/1.JRS.8.083559, 2014.

21. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CLASSIFICATION
Grassland management identification
SVM
Euclidean matching
SVM
DTW matching
K>0.8
K<0.8
K= 0.93
Grazing (1) Mowing (2) Mixed (3)
Simulated data
Dusseux P., Gong X., Hubert-Moy L., Corpetti T.,
Identification of grassland management practices from leaf
area index time series. Journal of Applied Remote Sensing,
8(1), 083559, doi:10.1117/1.JRS.8.083559, 2014.
K= 0.24

22. SÉMINAIRE ISIG, LABORATOIRE EVS, LYON
CONCLUSION
Optical / SAR / Optical-SAR images
SVM standard SVM Time warping
Optical images Grassland identification +
Grassland management
identification
- +
SAR images Grassland identification +
Grassland management
identification
- -
Optical-SAR images Grassland identification ++
Grassland management
identification
- -

23. Merci de votre attention