the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Water levels of the Mekong River Basin based on CryoSat-2 SAR data classification
Abstract. In this study we use CryoSat-2 SAR (Delay-Doppler Synthetic Aperture Radar) data over the Mekong River Basin to estimate water levels. Smaller inland waters can be observed with CryoSat-2 data with a higher accuracy compared to the classical radar altimeters due to the increased along track resolution of SAR and the smaller footprint. However, even with this SAR data the estimation of water levels over smaller (width less than 500 m) is still challenging as only very few consecutive observations over the water body are present. The usage of land-water-masks for target identification tends to fail as the river becomes smaller. Therefore, we developed a classification to divide the observations into water and land observations based solely on the observations.
The classification is done with an unsupervised classification algorithm, and it is based on features derived from the SAR and RIP (Range Integrated Power) waveforms. After the classification, classes representing water and land are identified. The measurements classified as water are used in a next step to estimate water levels for each crossing over the Mekong River. The resulting water levels are validated and compared to gauge data, Envisat data and CryoSat-2 water levels derived with a land-water mask. The CryoSat-2 classified water levels perform better than results based on the land-water-mask and Envisat. Especially, in the smaller upstream regions the improvements of the classification approach for CryoSat-2 are evident.
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RC1: 'Review of Article: “Water levels of the Mekong River Basin based on CryoSat-2 SAR data classification” (https://doi.org/10.5194/hess-2017-217), by Eva Boergens et al.', Anonymous Referee #1, 19 Jun 2017
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AC1: 'Answer to the review', Eva Boergens, 02 Aug 2017
- AC3: 'Track changed new manuscript', Eva Boergens, 02 Aug 2017
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AC1: 'Answer to the review', Eva Boergens, 02 Aug 2017
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RC2: 'Review "Water levels of the Mekong River Basin..."', Anonymous Referee #2, 24 Jun 2017
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AC2: 'Answer to the review', Eva Boergens, 02 Aug 2017
- AC4: 'Track changed new manuscript', Eva Boergens, 02 Aug 2017
-
AC2: 'Answer to the review', Eva Boergens, 02 Aug 2017
-
RC1: 'Review of Article: “Water levels of the Mekong River Basin based on CryoSat-2 SAR data classification” (https://doi.org/10.5194/hess-2017-217), by Eva Boergens et al.', Anonymous Referee #1, 19 Jun 2017
-
AC1: 'Answer to the review', Eva Boergens, 02 Aug 2017
- AC3: 'Track changed new manuscript', Eva Boergens, 02 Aug 2017
-
AC1: 'Answer to the review', Eva Boergens, 02 Aug 2017
-
RC2: 'Review "Water levels of the Mekong River Basin..."', Anonymous Referee #2, 24 Jun 2017
-
AC2: 'Answer to the review', Eva Boergens, 02 Aug 2017
- AC4: 'Track changed new manuscript', Eva Boergens, 02 Aug 2017
-
AC2: 'Answer to the review', Eva Boergens, 02 Aug 2017
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