Tonga Subnational NDVI: 10-Day Vegetation Indicators and Anomalies

A source of dekadal (10-day) Normalized Difference Vegetation Index (NDVI) indicators for Tonga, aggregated by sub-national administrative units using NASA MODIS collection 6.1 satellite data. Produced by the World Food Programme (WFP), the records include long-term averages and anomalies to track vegetation health over time. The data is current as of March 2026.

Use Cases

• Assessing crop health by comparing vim against the historical vim_lta baseline
• Detecting drought or environmental stress using the viq anomaly percentage
• Correlating vegetation changes with sub-national administrative regions using Pcode identifiers

Strengths

• Uses NASA MODIS collection 6.1 Aqua and Terra satellite data
• Includes historical baselines via the vim_lta column
• Provides n_pixels count to verify the data density of each aggregate

Limitations

• Aggregated at the sub-national level, masking local-scale vegetation variations
• Temporal resolution is fixed to 10-day dekadal intervals

Provenance

Source

World Food Programme (WFP) via NASA MODIS Collection 6.1

Collection Method

Satellite sensor data aggregation

Freshness

Updated as of March 2026.

Geography

Tonga