Capability of SRTM C- and X-band DEM Data to Measure Water Elevations in Ohio and the Amazon

I analyze Shuttle Radar Topography Mission (SRTM) water surface elevation data to the capacity of interferometric radar for future surface water missions. Elevations from Ohio reservoirs and several Amazon floodplain lakes have standard deviations, interpreted errors, that are smaller in C-band compared to X-band and are smaller in Ohio than in the. These trends are also evident when comparing water surface elevations from the River in Ohio with those of the Amazon River. Differences are attributed to averaging in C-band compared to X-band, greater sensitivity to surface water motion X-band, and generally larger off-nadir look angles in X-band. Absolute water surface are greater in the C-band DEM for much of the two study areas and yield expected values. Height and slope differences are attributed to differing usage of geoids and. These SRTM measurements suggest the great possibility for space-based, laterallyspatial(2D) measurements of water surface elevations.