Yemen Sub-National NDVI: Dekadal Vegetation Indicators and Anomalies

Yemen sub-national NDVI indicators derived from NASA MODIS collection 6.1 satellite data provide 10-day vegetation health metrics. Produced by the World Food Programme, the records are aggregated by administrative units and include historical averages and anomalies for monitoring environmental conditions.

Use Cases

• Monitoring drought severity by analyzing the viq (NDVI anomaly) column over time
• Assessing agricultural productivity trends using the vim (10-day NDVI) values
• Validating the statistical significance of regional averages using the n_pixels count

Strengths

• Uses NASA MODIS collection 6.1 high-resolution satellite data
• Includes n_pixels column to indicate the statistical reliability of each aggregated unit
• Standardized using WFP Pcode references for easy joining with other humanitarian data

Limitations

• Aggregated at the sub-national level, which obscures localized vegetation changes within administrative boundaries
• Subject to satellite sensor limitations such as cloud cover interference in the raw MODIS inputs

Provenance

Source

World Food Programme (WFP) using NASA MODIS collection 6.1

Collection Method

Satellite sensor data aggregation from NASA Aqua and Terra platforms

Freshness

Updated as of March 2026.

Geography

Yemen