Ethiopia: Normalized Difference Turbidity Index (NDTI) from Sentinel-2 Imagery

A geospatial dataset providing a water turbidity index analysis for Ethiopia, derived from Sentinel-2 Level-2A satellite imagery processed by the European Space Agency's Sen2Cor algorithm. The workflow includes cloud masking and water body extraction to compute the Normalized Difference Turbidity Index (NDTI), which helps detect suspended sediments and assess water clarity. The dataset was last updated on 2026-04 24 and is provided by the organization 3iS under a CC-BY-4.0 license.

Use Cases

• Monitor soil erosion and surface runoff based on elevated turbidity levels mentioned in the description.
• Manage reservoir sedimentation based on the analysis of suspended sediment detection.
• Assess drinking water safety and source protection based on water clarity assessments.
• Conduct contextual environmental monitoring, such as distinguishing natural mineral turbidity in Lake Langano from pollution events.

Strengths

• Derived from atmospherically corrected Sentinel-2 Level-2A (Surface Reflectance) imagery, a high-quality remote sensing source.
• Workflow includes specific processing steps like cloud masking and water body extraction to ensure measurements are taken only over water surfaces.
• Provides a decision-oriented index (NDTI) calculated using a defined formula with red and green spectral bands.

Limitations

• Description metadata is limited; actual data quality, column definitions, and spatial/temporal resolution require manual inspection after download.
• Row count and dataset size are unknown, which may limit suitability assessment for large-scale projects.
• The analysis is specific to Ethiopia; applicability to other regions may require validation.

Provenance

Source

3iS

Collection Method

Processed from Sentinel-2 Level-2A imagery using the Sen2Cor algorithm, followed by cloud masking, water body extraction, and NDTI calculation.

Time Range

null

Freshness

Last updated 2026-04-24 11:26:34.125499; freshness should be verified.

Geography

Ethiopia