Skip to main content
U.S. flag

An official website of the United States government

Louisiana wetland water level monitoring using retracked TOPEX/POSEIDON altimetry

January 1, 2009

Previous studies using satellite radar altimetry to observe inland river and wetland water level changes usually spatially average high-rate (10-Hz for TOPEX, 18-Hz for Envisat) measurements. Here we develop a technique to apply retracking of TOPEX waveforms by optimizing the estimated retracked gate positions using the Offset Center of Gravity retracker. This study, for the first time, utilizes stacking of retracked TOPEX data over Louisiana wetland and concludes that the water level observed by each of 10-Hz data with along-track sampling of ∼660 m exhibit variations, indicating detection of wetland dynamics. After further validations using nearby river gauges, we conclude that TOPEX is capable of measuring accurate water level changes beneath heavy-vegetation canopy region (swamp forest), and that it revealed wetland dynamic flow characteristics along track with spatial scale of 660 m or longer.

Citation Information

Publication Year 2009
Title Louisiana wetland water level monitoring using retracked TOPEX/POSEIDON altimetry
DOI 10.1080/01490410903094767
Authors H. Lee, C. K. Shum, Y. Yi, M. Ibaraki, J.-W. Kim, Andreas Braun, C.-Y. Kuo, Z. Lu
Publication Type Article
Publication Subtype Journal Article
Series Title Marine Geodesy
Index ID 70036886
Record Source USGS Publications Warehouse
USGS Organization Earth Resources Observation and Science (EROS) Center