Altimetric Waveforms In Coastal Regions and Continental Surfaces
This proposal has two main objectives: (1) to extend the CTOH service from GDR products to waveform SGDR products and (2) maximize information retrieval over continental surfaces and coastal regions derived from the combined analysis of multiple altimeter waveforms.
Even though SGDRs are already provided by space agencies, these data are not easy to obtain and their format is, frequently, specific to each mission. In practical terms, any researcher willing to use this data needs to do much tinkering in order to adapt the data to his or her particular workflow. This proposal, in the framework of an ongoing initiative with colleagues of the Toulouse region, aims to provide researchers not only the infrastructure where normalized SGDRs can be found (i.e. provided in a standard format for all available missions), but also a toolbox and a canvas to quickly create any processing involving the SGDRs.
Pulse to pulse correlations in altimeter echoes are strong in continental surfaces and coastal areas, even when separated by long time intervals. Our second objective is to explore new processing approaches of these data (with the RESIPE project for waveform inversion) as well as providing support for researchers working directly with waveforms, particularly surface characterization based on waveforms in the cryosphere, and new applications based on waveform inversion to obtain the backscatter (σ0) distribution using Tournadre's method. For the particular case of water bodies on continental surfaces, we will also systematically apply Bercher's method for assessment of the quality of altimetry-derived time series of water-levels combined to the classical crossover-point validation methodology Legresy et al. .