DSWx

Overview¶

The Dynamic Surface Water eXtent (DSWx) product suite maps the presence and extent of inland and near-shore surface water using optical and synthetic aperture radar (SAR) observations. DSWx supports OPERA’s surface-water mission objective, providing frequent, analysis-ready water maps for hydrology, flood response, and long-term water-resource monitoring.

Product level & distribution¶

• Processing level: Level-3

• DAAC: PO.DAAC

• Project: NASA OPERA (JPL)

Sub-products¶

• DSWx-HLS — derived from the Harmonized Landsat Sentinel-2 (HLS) dataset.

• DSWx-S1 — derived from Sentinel-1 C-band SAR, enabling water mapping under cloud cover and at night.

Applications¶

• Inland surface-water mapping and change detection

• Flood monitoring and disaster response

• Seasonal and inter-annual water-body dynamics

• Inputs for hydrologic and climate studies

Inputs¶

• Harmonized Landsat Sentinel-2 (HLS) surface reflectance (DSWx-HLS)

• Sentinel-1 SAR backscatter, e.g. OPERA RTC-S1 (DSWx-S1)

• Digital elevation model and ancillary water-reference layers

Coverage¶

Near-global land coverage, with cadence driven by the revisit of the underlying HLS and Sentinel-1 observations.

References¶

• OPERA project page: https://www.earthdata.nasa.gov/data/projects/opera

• PO.DAAC: https://podaac.jpl.nasa.gov/

• DSWx-HLS at PO.DAAC: https://podaac.jpl.nasa.gov/dataset/OPERA_L3_DSWX-HLS_V1

• DSWx-S1 at PO.DAAC: https://podaac.jpl.nasa.gov/dataset/OPERA_L3_DSWX-S1_V1