Abstract
Abstract. Differential SAR Interferometry (DInSAR) is the process of differencing two Interferograms for measuring surface movement with an accuracy of millimeter range. The DInSAR process can be applied to observe glacier movement, earthquake deformations, volcanic activities and rate of subsidence or uplift caused due to the extraction of groundwater or coal. By using single pass interferometry technique we can also generate accurate DEM. In this paper, we are presenting the movement of a Chhota Shigri glacier with the help two pass DInSAR technique and mainly we concentrated on the optimum conditions for estimating glacier movement using DInSAR. We got good coherence and Interferogram fringes for L-band sensor with less temporal baseline. Therefore, we generated glacier velocity using ALOS-2 data with 14 days temporal baseline. Initially, we generated Interferogram (defo-pair) by taking 10th March 2015 image as a master and 24th March 2015 image as a slave. But this generated Interferogram also having topographic information and atmospheric errors with the displacement component. Therefore, we used SRTM DEM for removing topographic information from the Interferogram. Because we are using L-band data, results may not be affected by troposphere. Maximum glacier velocity we observed in the accumulation zone as 7.285 cm/day in the month of March and while it’s moving towards ablation zone the glacier velocity is decreasing.
Highlights
INTRODUCTIONGlacier is one of the important components in the cryosphere to check climate and temperature changes
First coherence image is generated by using ALOS-2 L-band satellite data of wavelength nearly 24 cm and 14 days temporal gap, second coherence image is generated by using Sentinel C-band satellite data of wavelength is nearly 5.4 cm and 6 days temporal gap and third coherence image is generated by using TerraSAR X-band satellite data of wavelength is nearly 3 cm and 11 days temporal gap
We estimated the maximum velocity of a Chhota Shigri glacier as 7.285 cm/day or 26.59 m/yr in LOS direction at the accumulation zone
Summary
Glacier is one of the important components in the cryosphere to check climate and temperature changes. Microwave data is more useful to monitor glaciers due to it’s penetration capability. Goldstein et al, (1993) [1] first time used satellite radar interferometry (SRI) technique to monitor the velocity of the ice sheet. DinSAR uses the phase information present in the SAR images to precisely estimate the movement or displacement of a particular target point between two SAR images. 2. 2 Pass DInSAR is used to estimate glacier movement with the help of an external DEM to remove topographic phase from the generated interferogram by using two SAR images. Glacier velocity can be estimated by subtracting these two interferograms without using an external DEM. The double-blind peer-review was conducted on the basis of the full paper
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
