The MEaSUREs Pre-Surface Water and Ocean Topography (SWOT) Hydrology datasets provide time series of river and lake/reservoir heights, lake/reservoir storage, and grids of lake/reservoir surface area. These 5 datasets are derived from ERS-1 & 2, TOPEX/Poseidon, Jason-1, 2 & 3 and MODIS on Aqua and Terra measurements, and are provided as time series for virtual gauges or grids of surface area extent. The intent is to provide satellite data for hydrological measurements that are typically measured from in situ gauges. These data are available every 10 days from October 1992 to November 2018, with the exception of the daily river height dataset.

The MEaSUREs Pre-SWOT Hydrology datasets are described and discoverable via the PO.DAAC data portal. More information regarding the data is available from PO.DAAC's mission page.

Location of the global lake and reservoir targets (blue bubbles, by average lake/reservoir size).