scholarly journals Snow Water Equivalent Change Mapping from Slope Correlated InSAR Phase Variations

2021 ◽  
Author(s):  
Jayson Eppler ◽  
Bernhard T. Rabus ◽  
Peter Morse
Keyword(s):  
Synthetic Aperture Radar ◽  
Snow Water Equivalent ◽  
Phase Unwrapping ◽  
Passive Microwave ◽  
Synthetic Aperture ◽  
Estimation Methods ◽  
Glacier Mass Balance ◽  
Drainage Basins ◽  
Snow Water ◽  
Aperture Radar

Abstract. Area-based measurements of snow water equivalent (SWE) are important for understanding earth system processes such as glacier mass balance, winter hydrological storage in drainage basins and ground thermal regimes. Remote sensing techniques are ideally suited for wide-scale area-based mapping with the most commonly used technique to measure SWE being passive-microwave, which is limited to coarse spatial resolutions of 25 km or greater, and to areas without significant topographic variation. Passive-microwave also has a negative bias for large SWE. Repeat-pass synthetic aperture radar interferometry (InSAR) as an alternate technique allows measurement of SWE change at much higher spatial resolution. However, it has not been widely adopted because: (1) the phase unwrapping problem has not been robustly addressed, especially for interferograms with poor coherence and; (2) SWE change maps scaled directly from repeat-pass interferograms are not an absolute measurement but contain unknown offsets for each contiguous coherent area. We develop and test a novel method for repeat-pass InSAR based dry-snow SWE estimation that exploits the sensitivity of the dry-snow refraction-induced InSAR phase to topographic variations. The method robustly estimates absolute SWE change at spatial resolutions of < 1 km, without the need for phase unwrapping. We derive a quantitative signal model for this new SWE change estimator and identify the relevant sources of bias. The method is demonstrated using both simulated SWE distributions and a 9-year RADARSAT-2 spotlight-mode dataset near Inuvik, NWT, Canada. SWE results are compared to in situ snow survey measurements and estimates from ERA5 reanalysis. Our method performs well in high-relief areas and in areas with high SWE (> 150 mm), thus providing complementary coverage to other passive- and active-microwave based SWE estimation methods. Further, our method has the advantage of requiring only a single wavelength band and thus can utilize existing spaceborne synthetic aperture radar systems. In application, a first order analysis of SWE trends within three drainage basins suggests that differences between basin-level accumulations are a function of major landcover types, and that re-vegetation following a forest-tundra fire that occurred over 50 years ago continues to affect the spatial distribution of SWE accumulation in the study area.

Reach scale floodplain inundation dynamics observed using airborne synthetic aperture radar imagery: Data analysis and modelling

2006 ◽  
Vol 328 (1-2) ◽  
pp. 306-318 ◽  
Author(s):  
Paul D. Bates ◽  
Matthew D. Wilson ◽  
Matthew S. Horritt ◽  
David C. Mason ◽  
Nick Holden ◽  
...  
Keyword(s):  
Data Analysis ◽  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Radar Imagery ◽  
Floodplain Inundation ◽  
Synthetic Aperture Radar Imagery ◽  
Aperture Radar ◽  
Imagery Data

scholarly journals Prediksi Penurunan Muka Tanah Menggunakan Teknik Differential Interferometic Synthetic Aperture Radar (Dinsar) Di Kota Makassar Indonesia

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Nur Afdal Haris
Keyword(s):  
Data Analysis ◽  
Synthetic Aperture Radar ◽  
Land Subsidence ◽  
Average Rate ◽  
Image Data ◽  
Synthetic Aperture ◽  
Interferometric Synthetic Aperture Radar ◽  
Alos Palsar ◽  
Aperture Radar

Based ont the results of the ALOS Palsar image data analysis using the Differential Interferometric Synthetic Aperture Radar (DInSAR) technique on ENVI Sarscape application. The results of this study indicated that the amount of land subsidence in Makassar City from 2007-2011 was 5.8 cm with an average rate of land subsidence reaching 0.73 cm/year. Areas run into land subsidence are all sub-districts in Makassar City with variations land subsidence values from 0.09 – 5.8 cm.

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