Improvements in geophysical corrections for coastal altimetry using retracked data
E. Lucy Mathers(1) and M. Joana Fernandes(2)
De Montfort University,
Faculty of Computing Sciences and Engineering,
Leicester LE1 9BH,
(2) Faculty of Science, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
While the primary reason for under-utilisation of satellite radar altimeter data in coastal regions over the past 15 years is the lack of available data due to the influence of the land within the altimeter footprint, the availability and accuracy of geophysical corrections in the coastal zone poses a significant challenge. New retracked multi-mission altimeter data sets have been generated by the Earth and Planetary Remote Sensing (EAPRS) lab. using an expert system to select an appropriate retracking algorithm based on altimeter waveform shape. These data sets are merged with 1 Hz GDR data sets and state-of-art geophysical corrections at the Faculty of Science, University of Porto.
This paper presents an investigation of the performance of various geophysical corrections in the coastal zone. Particular attention is given to the wet tropospheric correction and the sea state bias; improved techniques for modelling these corrections are presented. The current status of altimetry data use in coastal applications and the focus for future work in this field are discussed.