---
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:

```python
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)