Guiana Shield Activities Radar Point of view

Transcription

1 Guiana Shield Activities Radar Point of view SAR Technical Workshop for Forest Mapping Session 2 Applications - April 2015 Cédric Lardeux Jean-Paul Rudant Pierre-Louis Frison cedric.lardeux@onfinternational.com rudant@univ-mlv.fr frison@univ-mlv.fr

2 OUTLINE I. Forest Stratification II. Forest Coastal Dynamic III. Deforestation IV. Gold Mining V. Biomass estimation

3 OUTLINE I. Forest Stratification II. Forest Coastal Dynamic III. Deforestation IV. Gold Mining V. Biomass estimation

4 Forest Stratification Radar Sensitivity Vegetation density Vegetation structure Ground beneath vegetation Understory Wavelength / Polarization for different discrimination types (forest, flooded forest, non forest,...)

5 Forest Stratification - Gabon Dense Forest Mangrove Clear cut in Mangrove ERS 1993 Savannah/Forest Dynamics ERS 1995 ERS 1999 PALSAR HH/HV Libreville, Gabon 10/08/2007 SAR Technical Workshop for Forest Mapping Session 2 - Applications April 2015

6 Forest Stratification - Gabon ERS 1993 ERS 1995 HH HV HV-HH INC Gabon : from PALSAR FBD data ERS 1999 PALSAR HH/HV Libreville, Gabon 10/08/2007 Coll: Centre National carto, ENEF Dense Forest Degraded Forest Mangrove Water Urban Area

7 Forest Stratification RDC Quickbird PALSAR mai 2007 IHH IHV IVV Different forest + or - flooded

8 Forest Stratification French Guyana French Guyana Brazil Mainly covered by tropical forest Primary forest, mangroves Savannah

9 Forest Stratification Primary forest Class Type Class name Primary forest Young Mangroves Forest Deforestation Adult Mangroves Degraded Mangroves Dry Savannah Low vegetation Swamp Dry savannah Photo : B. Riera Graminoids Swampy savannah

10 Forest Stratification Full Polarimetry Pauli decomposition Partial Polarimetry hh hv hv-hh

11 Forest Stratification Full Polarimetry Degraded Mangrove Young Mangroves Pauli decomposition Dry Savannah Cayenne Graminoids Adult Mangroves Swamp 11

12 Forest Stratification Full Polarimetry Pauli decomposition Partial Polarimetry hh hv hv-hh

13 Forest Stratification Classification results Class name Primary forest Young Mangroves Adult Mangroves Degraded Mangroves Dry Savannah Graminoids Swamp Overall Accuracy HH/HV/VV HH/HV VV/HV Partial Polarimetry hh hv hv-hh

14 Forest Stratification Plantation Brazil Plantation (50 species) Mainly native species Natural regeneration Herbaceous / Sparse trees area 20 different stratum! Species, age, spacing Big challenge

15 Forest Stratification Plantation Brazil Pauli Double Volume Single 20 different stratum! 9 Polarimetric SAR classes Sparse trees Natural forest Woodland (Teck) Dense plantation

16 Forest Stratification Plantation Brazil Class Type Forest Natural forest Dense Plantation Woodland Sparse trees Class name Primary forest Dense Plant - 1 Dense Plant - 2 Woodland-1 Woodland-2 Sparse Trees-1 Sparse Trees-2 Sparse Trees-3 Sparse Trees-4 Woodland-1 (Teck) Dense plantation Sparse trees

17 Forest Stratification Plantation Brazil Full Polarimetry Pauli decomposition Partial Polarimetry hh hv hv-hh

18 Forest Stratification Plantation Brazil Class name Primary forest Dense Plant - 1 Dense Plant - 2 Woodland-1 Woodland-2 Sparse Trees-1 Sparse Trees-2 Sparse Trees-3 Sparse Trees-4 Overall Accuracy HH/HV/VV HH/HV VV/HV

19 OUTLINE I. Forest Stratification II. Forest Coastal Dynamic III. Deforestation IV. Gold Mining V. Biomass estimation

20 Forest Coastal Dynamic Radar Sensitivity Water (low backscattering) Roughness Ground (Higher bacscattering)

21 Forest Coastal Dynamic French Guyana ERS 1993 ERS 1995 ERS km

22 Forest Coastal Dynamic French Guyana ERS 1993 ERS 1995 Erosion Sedimentation ERS 1999

23 OUTLINE I. Forest Stratification II. Forest Coastal Dynamic III. Deforestation IV. Gold Mining V. Biomass estimation

24 Deforestation Radar Sensitivity Similar to Forest stratification Vegetation density Change detection

25 Deforestation French Guyana RoadWork Clear Cut area Witdh 90m ASAR

26 Deforestation French Guyana ERS 25 m

27 Deforestation - DRC Paslar July 2007 hh hv hv-hh

28 Deforestation - DRC Paslar Sept 2010 hh hv hv-hh

29 Deforestation - DRC Deforestation High regrowth Low regrowth Paslar July Sept 2010 hh hv hv-hh

30 Deforestation - DRC Deforestation High regrowth Low regrowth Paslar July Sept 2010 hh hv hv-hh

31 OUTLINE I. Forest Stratification II. Forest Coastal Dynamic III. Deforestation IV. Gold Mining V. Biomass estimation

32 Gold Mining Radar Sensitivity Similar to deforestation Vegetation density Change detection You need contextual information

33 Gold Mining/Burned land French Guyana ERS 25 m

34 OUTLINE I. Forest Stratification II. Forest Coastal Dynamic III. Deforestation IV. Gold Mining V. Biomass estimation

35 Forest Biomass Key component of the Carbon cycle Bande L ( = 25 cm) Forests: 70-90% of global biomass (mostly tropical forest) Forest Biomass: high uncertainties for Carbon fluxes estimates RADAR Intensity Biomass ~50% Carbon BIOMASS (t DM ha-1) Mermoz et al., RSE, 2013

36 Savannah Biomass estimation ALOS data (L band) Saatchi et al., 2011 Baccini et al., 2012 Bouvet et al., Mg ha Mg ha Mg ha Mg ha Mg ha-1 > 100 Mg ha Mg ha-1 water Mg ha-1 no data L Band ==> Biomass < 100 t DM ha-1

37 Savannah Biomass estimation ALOS data (L band) Saatchi et al., 2011 Baccini et al., 2012 Bouvet et al., 2013 Resolution 50 m 0-10 Mg ha Mg ha Mg ha Mg ha Mg ha-1 > 100 Mg ha Mg ha-1 water Mg ha-1 Needs of in situ measurements for validation Guiana Shield? no data SAR Technical Workshop for Forest Mapping Session 2 - Applications April 2015