Algorithm Theoretical Basis Document (ATBD) for Along-Track Inland Surface Water Level Products as derived from Short-Repeat Satellite Radar Altimeters

This document describes the theoretical basis of the algorithms employed in the processing of satellite data from short-repeat (revisit time is within approximately 1-month) satellite radar altimeter missions, and the subsequent approach to the formation of products associated with time-varying inland water surface water levels. These Level 3 products are derived from multiple missions, employ repeat-track methodology, and are output for select lake, reservoir, river reach, and wetland crossings. The ATBD includes descriptions of the Level 2 satellite data, the auxiliary datasets, the overall approach and assumptions, and the format and content of the final products.