GLC 2000 – “FIRST RESULTS” WORKSHOP JRC – Ispra, 18-22 March 2002 GLC 2000 – South America...
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Transcript of GLC 2000 – “FIRST RESULTS” WORKSHOP JRC – Ispra, 18-22 March 2002 GLC 2000 – South America...
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
GLC 2000 – South America map
Presented by H.Eva
E. E. de Miranda C. di Bella
V. Gond O.Huber S.Jones
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Contributing Institutions
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Logistical Approach
1/. Centralised processing
2/. First-pass class labels
3/. Regional expert assessment of classes – re-labeling
4/. Class rationalisation
5/. Integration of specialist areas for regional product
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
1/. Centralised processing –the data set
Creation of seasonal mosaics from S10 product
Jan-Mar Apr-Jun July-Sept Oct-Dec
Cloud Screening
Image selection on lowest SWIR
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
•Combining of VGT seasonal images•Masking of evergreen forest (use of TREES 2000)
•Unsupervised clustering to 50 classes
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
2/. First pass class labeling
-Semi- evergreen forest
-Dry forest
-Shrubs (dense / sparse)
-Savannah with shrubs
-Savannah
-Sparse grasslands
-Agriculture
-Barren
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Class labeling
-Spectral signature
-Texture and context
-NDVI profile
-Existing land cover maps and ancillary data
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Major Problems
•Cloud shadow in forest areas and Andes
•Seasonal aspects not directly related to the land cover – snow / flooding / burning
• Main spectral ambiguity – grasslands / agriculture
•Urban areas not easy to descriminate
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Main problem areas – V1.1
NE Brazil Caatingas
Andes transect
Southern Brazil
Argentina from Monte to Steppe
Magellan grasslands
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Venezuela
Brazil
Southern Cone
Amazon forest
3/. Regional Experts working on data
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Regional Experts helping with validation
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
4/. Integration of specialist areas for regional product
Whilst all of South America is completed to the mimimum GLC 2000 legend – some areas/land cover types will have more detailed products
-NE Brazil
-Swamp forests (JERS-1 data)
-Bamboo dominated forests (Acre / Peru)
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Class rationalisation with other tropical regions
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Intercontinental comparisons of vegetation dynamic from NDVI- derived parameters for each map class
-maximum NDVI
-adjusted minimum NDVI
-range of NDVI
-rates of change of NDVI
-integrated NDVI
-parameters of seasonality (fit of seasonally adjusted curves)
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
NDVI maximum monthly image – allowing intercontinental comparisons
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
-NE Brazil should be ratified with EMBRAPA by the end of March
- A final “draft” for July / August
-first draft map has been created
-Errors due to spectral confusion
-Lack of adequate knowledge of certain cover types
Current Status
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
Final Comment
Importance of the Global Legend
Importance of the Regional Legends and the partnerships with national experts worldwide