Chad: Subnational Dekadal NDVI and Vegetation Anomalies

Delivering dekadal NDVI (Normalized Difference Vegetation Index) indicators for Chad, aggregated by sub-national administrative units using NASA MODIS collection 6.1 satellite data. Produced by the World Food Programme (WFP), the data tracks vegetation health through 10-day intervals, long-term averages, and percentage anomalies. It utilizes WFP-defined administrative boundaries and includes Pcode references for humanitarian data integration.

Use Cases

• Monitoring drought conditions by analyzing the viq anomaly column over time
• Comparing current vegetation health against historical norms using the vim_lta field
• Validating agricultural productivity models using the vim 10-day indicators

Strengths

• Uses NASA MODIS collection 6.1 high-resolution satellite data
• Includes Pcode references for joining with other WFP humanitarian datasets
• Provides n_pixels to indicate the statistical weight of each aggregate

Limitations

• Aggregated at the administrative level, which obscures granular pixel-level spatial variance
• Dependent on WFP-specific administrative boundaries which may differ from official government shapes

Provenance

Source

World Food Programme (WFP) using NASA MODIS (Aqua and Terra) collection 6.1

Collection Method

Satellite sensor data aggregation

Freshness

Last updated March 2026.

Geography

Chad