FloodScan: Global Daily Flood Mapping with 10-Year Historical Baselines

JANUS Atmospheric and Environmental Research provides daily global flood mapping via satellite data, featuring both tabular administrative statistics and 10km resolution gridded data. The dataset includes current flood fractions, 10-year historical baselines, and empirical Return Period calculations updated daily. It covers administrative levels 1 and 2 globally alongside a rolling 90-day window of spatial imagery.

Use Cases

• Comparing current SFED flood fractions against SFED_BASELINE to identify abnormal inundation levels for disaster monitoring
• Assessing flood severity at administrative levels using the RP (Return Period) column to prioritize humanitarian aid
• Analyzing spatial flood distribution using the 10km gridded GeoTIFF bands for regional hydrological modeling

Strengths

• Includes 10-year historical baseline values calculated with an 11-day smoothing window
• Provides dual formats: tabular XLSX for administrative analysis and GeoTIFF for spatial GIS applications
• Features empirical Return Period (RP) calculations based on all historical data up to the current year

Limitations

• Spatial resolution is relatively coarse at approximately 10km, which may not capture localized or urban flash flooding
• Gridded data access is restricted to a rolling 90-day window, preventing long-term historical spatial analysis from a single snapshot

Provenance

Source

JANUS Atmospheric and Environmental Research

Collection Method

Satellite-derived flood mapping and statistical calculation from 10-year historical archives

Time Range

Current year plus 10-year historical baseline

Freshness

Updated daily with near real-time satellite observations.

Geography

Global