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HWDS-Multimodal
Dataset Summary
The hail and wind damage swath database spans a 21-year climatology (2000–2020) — for full details see hwds_db.
Chips & Labels
Chips are generated from a buffered region around each damage polygon sourced from hwds_db. The buffer ensures the dataset includes chips with no damage.
| HLS | RTC | |
|---|---|---|
| Resolution | 30m | 30m |
| Size | 256 × 256 px | 256 × 256 px |
| Format | GeoTIFF | GeoTIFF |
| Bands | B, G, R, N, SW1, SW2 | VV, VH |
| Units | Scaled Surface reflectance | Backscatter (dB) |
Each chip has a corresponding single-band GeoTIFF damage mask rasterized from the swath polygon. Chips intersecting nodata or are filtered out.
| Mask Value | Description |
|---|---|
| 0 | No damage |
| 1 | Damage |
Data Sources
HLS (Harmonized Landsat Sentinel-2)
Harmonized surface reflectance from Landsat 8/9 (HLSL30) and Sentinel-2 (HLSS30) at 30m resolution, accessed via NASA Earthdata. Landsat and Sentinel-2 scenes are harmonized to a common grid and radiometric baseline. Values have a scale factor of 0.0001 compared to surface reflectance. The following bands are used:
| Band | Description |
|---|---|
| B | Blue |
| G | Green |
| R | Red |
| N | Near-infrared |
| SW1 | SWIR 1 |
| SW2 | SWIR 2 |
RTC (Radiometric Terrain Corrected SAR)
Sentinel-1 RTC backscatter from the OPERA RTC product, accessed via ASF Datapool.
| Band | Description |
|---|---|
| VV | Co-polarization, dB scale |
| VH | Cross-polarization, dB scale |
Dataset Structure
hwds_multimodal/
├── CHIPS/
│ ├── {row}.{col}.{swath_id}.HLS.{date}.BANDS.tif
│ ├── {row}.{col}.{swath_id}.RTC.{date}.BANDS.tif
│ └── {row}.{col}.{swath_id}.MASK.tif
└── statistics.json
Chips are stored flat in CHIPS/ with a shared filename convention: {row}.{col}.{swath_id} serves as the chip ID, linking each HLS image, RTC image, and damage mask for a given location. HLS and RTC files include their sensor acquisition date; the mask is dateless as it applies to both modalities.
Here are some mosaics showing chip selection across modalities. Blue indicates a selected chip, yellow indicates a filtered chip (cloud mask for HLS, validity mask for RTC):
| HLS | RTC |
|---|---|
 |
 |
statistics.json contains per-band mean and standard deviation for normalization.
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