Sierra Leone Subnational NDVI: Dekadal Vegetation Indices and Anomalies

Sierra Leone dekadal NDVI indicators aggregated by sub-national administrative units from NASA MODIS collection 6.1 satellite data. Produced by the World Food Programme (WFP), the data provides 10-day vegetation indices and anomalies for monitoring agricultural health. The records include pixel counts and Pcode references for spatial alignment with WFP administrative boundaries.

Use Cases

• Analyzing vegetation health trends using the viq anomaly indicator to identify drought conditions
• Comparing current vegetation levels (vim) against historical baselines (vim_lta) for food security monitoring
• Validating administrative unit data quality using the n_pixels column to assess observation density

Strengths

• Uses NASA MODIS collection 6.1 high-resolution satellite data from both Aqua and Terra platforms
• Includes long-term average (vim_lta) for historical baseline comparison
• Provides pixel counts (n_pixels) to indicate the statistical reliability of each aggregate

Limitations

• Aggregated at sub-national levels, which obscures granular pixel-level spatial variance
• Dependent on cloud-free satellite observations for accurate NDVI calculation

Provenance

Source

World Food Programme (WFP) using NASA MODIS collection 6.1

Collection Method

Satellite sensor data aggregation

Freshness

Updated as of March 2026

Geography

Sierra Leone