README.md

metadata

license: mit

Flood Detection Dataset

Overview

This repository contains model output parquet files and geotiffs from our flood detection research. The data is organized in 3° × 3° tiles, with each tile containing both tabular data and processed geotiff images.

Directory Structure

├── N27                          # Main directory by latitude
│   ├── N27E030                 # Subdirectory for specific tile
│   │   ├── N27E030.parquet    # Tabular data
│   │   ├── N27E030_90m.tif    # Geotiff with 90m buffer
│   │   └── N27E030_240m.tif   # Geotiff with 240m buffer

The naming convention uses the southwest corner coordinates of each tile. For example, N27E030 represents:

• Latitude: 27°N to 30°N
• Longitude: 30°E to 33°E

Schema

Column	Type	Description
year	int	Year of observation
month	int	Month of observation
day	int	Day of observation
lat	float	Latitude of potential flood detection (pixel center)
lon	float	Longitude of potential flood detection (pixel center)
filename	str	Corresponding Sentinel-1 file name
land_cover	int	ESA WorldCover land cover classification
dem_metric_1	float	Individual pixel slope
dem_metric_2	float	Maximum slope within 240m
soil_moisture	float	LPRM algorithm absolute soil moisture (%)
soil_moisture_zscore	float	Soil moisture anomaly (Oct 2014-Sep 2024 baseline)
soil_moisture_sca	float	SCA algorithm absolute soil moisture (%)
soil_moisture_sca_zscore	float	SCA soil moisture anomaly (Oct 2014-Sep 2024 baseline)
temp	float	Average daily minimum temperature (1991-2020 climate)
edge_false_positives	int	Edge effect detection flag

Recommended Filtering

For optimal results, we recommend applying the following filters:

filters = {
    'dem_metric_2': '< 10',
    'soil_moisture_sca': '> 1',
    'soil_moisture_zscore': '> 1',
    'soil_moisture': '> 20',
    'temp': '> 0',
    'land_cover': '!= 60',  # exclude bare ground
    'edge_false_positives': '= 0'
}

Spatial Resolution

• Current Status (Oct 31, 2024):
  • Africa and South America: 20-meter resolution
  • Rest of world: 30-meter resolution (20-meter update expected later this year)