The Multiple Waveform Persistent Peak (MWaPP) Retracker for SAR waveforms

Heidi Villadsen; Ole Baltazar Andersen; Lars Stenseng; Karina Nielsen; Per Knudsen

Abstract

Here we present a new method for retracking of SAR waveforms over rivers and lakes. Satellite altimetry offers frequent and global sampling across borders, which can be used to validate and calibrate hydrological models in remote areas where in situ measurements are scarce.
The method was developed using CryoSat-2 20Hz SAR data, but due to the similarities between the Sentinel-3 SRAL altimeter and the SIRAL altimeter on-board CryoSat-2 an adaption of the method will be straightforward.
The MWaPP retracker is based on a sub-waveform retracker, but takes the shape of adjacent waveforms into account before selecting the sub-waveform belonging to nadir. This is new compared to primary peak retrackers, and alleviates a lot of snagging due to off-nadir bright targets, but also topography challenges.
The results from the MWaPP retracker show a significant decrease in the standard deviation of the mean of various lake and river crossings throughout the world. Results are presented for rivers and lakes, such as The Brahmaputra River, The Amazon River, The River Thames, and for Lake Vänern in Sweden and Lake Okeechobee in Florida, US.

Original language	English
Publication date	2016
Number of pages	1
Publication status	Published - 2016
Event	ESA Living Planet Symposium 2016 - Prague, Czech Republic Duration: 9 May 2016 → 13 May 2016 http://lps16.esa.int/

Conference

Conference	ESA Living Planet Symposium 2016
Country/Territory	Czech Republic
City	Prague
Period	09/05/2016 → 13/05/2016
Internet address	http://lps16.esa.int/

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http://lps16.esa.int/page_session187.php#740p

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Cite this

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title = "The Multiple Waveform Persistent Peak (MWaPP) Retracker for SAR waveforms",

abstract = "Here we present a new method for retracking of SAR waveforms over rivers and lakes. Satellite altimetry offers frequent and global sampling across borders, which can be used to validate and calibrate hydrological models in remote areas where in situ measurements are scarce.The method was developed using CryoSat-2 20Hz SAR data, but due to the similarities between the Sentinel-3 SRAL altimeter and the SIRAL altimeter on-board CryoSat-2 an adaption of the method will be straightforward. The MWaPP retracker is based on a sub-waveform retracker, but takes the shape of adjacent waveforms into account before selecting the sub-waveform belonging to nadir. This is new compared to primary peak retrackers, and alleviates a lot of snagging due to off-nadir bright targets, but also topography challenges. The results from the MWaPP retracker show a significant decrease in the standard deviation of the mean of various lake and river crossings throughout the world. Results are presented for rivers and lakes, such as The Brahmaputra River, The Amazon River, The River Thames, and for Lake V{\"a}nern in Sweden and Lake Okeechobee in Florida, US. ",

author = "Heidi Villadsen and Andersen, {Ole Baltazar} and Lars Stenseng and Karina Nielsen and Per Knudsen",

year = "2016",

language = "English",

note = "ESA Living Planet Symposium 2016 ; Conference date: 09-05-2016 Through 13-05-2016",

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T1 - The Multiple Waveform Persistent Peak (MWaPP) Retracker for SAR waveforms

AU - Villadsen, Heidi

AU - Andersen, Ole Baltazar

AU - Stenseng, Lars

AU - Nielsen, Karina

AU - Knudsen, Per

PY - 2016

Y1 - 2016

N2 - Here we present a new method for retracking of SAR waveforms over rivers and lakes. Satellite altimetry offers frequent and global sampling across borders, which can be used to validate and calibrate hydrological models in remote areas where in situ measurements are scarce.The method was developed using CryoSat-2 20Hz SAR data, but due to the similarities between the Sentinel-3 SRAL altimeter and the SIRAL altimeter on-board CryoSat-2 an adaption of the method will be straightforward. The MWaPP retracker is based on a sub-waveform retracker, but takes the shape of adjacent waveforms into account before selecting the sub-waveform belonging to nadir. This is new compared to primary peak retrackers, and alleviates a lot of snagging due to off-nadir bright targets, but also topography challenges. The results from the MWaPP retracker show a significant decrease in the standard deviation of the mean of various lake and river crossings throughout the world. Results are presented for rivers and lakes, such as The Brahmaputra River, The Amazon River, The River Thames, and for Lake Vänern in Sweden and Lake Okeechobee in Florida, US.

AB - Here we present a new method for retracking of SAR waveforms over rivers and lakes. Satellite altimetry offers frequent and global sampling across borders, which can be used to validate and calibrate hydrological models in remote areas where in situ measurements are scarce.The method was developed using CryoSat-2 20Hz SAR data, but due to the similarities between the Sentinel-3 SRAL altimeter and the SIRAL altimeter on-board CryoSat-2 an adaption of the method will be straightforward. The MWaPP retracker is based on a sub-waveform retracker, but takes the shape of adjacent waveforms into account before selecting the sub-waveform belonging to nadir. This is new compared to primary peak retrackers, and alleviates a lot of snagging due to off-nadir bright targets, but also topography challenges. The results from the MWaPP retracker show a significant decrease in the standard deviation of the mean of various lake and river crossings throughout the world. Results are presented for rivers and lakes, such as The Brahmaputra River, The Amazon River, The River Thames, and for Lake Vänern in Sweden and Lake Okeechobee in Florida, US.

M3 - Conference abstract for conference

T2 - ESA Living Planet Symposium 2016

Y2 - 9 May 2016 through 13 May 2016

ER -