ATL13QL is the quick look version of ATL13 and is based on the same algorithms that generate the ATL13 final data products. Once final ATL13 files are available, the corresponding ATL13QL files are removed. ATL13QL provides along-track surface water products for inland water bodies, defined as lakes, reservoirs, bays, estuaries, rivers, and a 7 km near-shore buffer. Principal data parameters include surface water height statistics, significant wave height, subsurface signal attenuation, and shallow bathymetry. Water surface heights are provided as both orthometric height and height referencing the WGS84 ellipsoid.