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GLC 2000 Land Cover Map of the Desert Locust Recession Area: First Results

This study presents the first results of the GLC 2000 land cover map for the desert locust recession area, focusing on drylands. The input data includes S10 NDVI for 2000, re-scaled in vegetation cover percentage, with soil effects removed and temporal profiles smoothed. The classification procedure is based on temporal profiles and rigid thresholds on maximum vegetation cover and season duration. The study provides valuable insights into land cover classes in the region.

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GLC 2000 Land Cover Map of the Desert Locust Recession Area: First Results

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  1. GLC 2000 land cover map of the desert locust recession area First results E. Bartholomé, JRC Ispra M. Cherlet, FAO Rome

  2. The desert locust recession area 19°W – 80°30’E, 46°N – 4°N Main focus on drylands

  3. Input data • S10 NDVI for 2000 • Re-scaled in vegetation cover percentage • Soil effect removed (per-pixel method) • Temporal profile smoothed (see ad hoc presentation)

  4. cover • Seasonality: max in summer or winter, or double seasonality 1/3 time Classification procedure Based on temporal profiles Rigid tresholds on: • Max vegetation cover in 2000 • Season duration

  5. Rationale • Cover max • corresponds to max development of vegetation • Best correlates with above-ground biomass • duration Duration close to phenological definition, but time lag

  6. 100% 9 75% 6 8 4 10 50% 6 8 25% 5 7 2 10% 3 5% 1 1 3 6 9 12 months Classes Max cover 1 BARE AREAS 2 SPARSE HERBACEOUS VEGETATION - NOT ANNUAL - TBC 3 SPARSE HERBACEOUS VEG 4 CLOSED-OPEN HERBACEOUS VEG 5 SPARSE DECIDUOUS SHRUB AND SPARSE HERBACEOUS VEGETATION 6 OPEN DECIDUOUS SHRUB AND OPEN HERBACEOUS VEGETATION 7 SPARSE DECIDUOUS SHRUB AND SPARSE HERBACEOUS VEGETATION AND SPARSE TREE LAYER 8 OPEN DECIDUOUS SHRUB AND OPEN HERBACEOUS VEGETATION AND SPARSE TREE LAYER 9 CLOSED-OPEN DECIDUOUS SHRUB AND CLOSED- OPEN HERBACEOUS VEGETATION AND OPEN TREE LAYER 10 NOT DEFINED Growth duration The same applies for winter vegetation and double season growth

  7. Result

  8. Close-up (1) Sarir (Libya) Irrigated agriculture

  9. Close-up (2) Luxor (Egypt) double growing season

  10. Close-up (3) Senegal - Mauritania

  11. Observation 1 • Noise in the 3-5% cover range Haruj es Sawda Volcano (Libya)

  12. Observation 2 • Specific year 2000 situation 1999-2000 2000-2001 Land cover map

  13. Observation 3 • Cropland not detected per se: low % of surface

  14. conclusions • The method seems efficient for dryland vegetation (bare soil correctly mapped!) • The method is sensitive to the specific year for very sparse vegetation • Some “soil contamination” • Need for regional analysis to label the land cover classes

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