Within each movie, the speckle tracking in multi-temporal Sentinel-1 SAR images is presented on the left. The plot of the glacier velocity over time and over locations along the length of the glacier is presented on the right. A magenta triangle is used to indicate the approximate time of the frame on the left with the corresponding row in the plot on the right.
For both the Steele and Walsh Glaciers, their surges appear to have significantly subsided (and possibly ended) within the second half of the year 2016.
I made a movie with some of my results. However, there is currently a large jump from July 2016 to November 2016. Click on the image to view the movie.
After a few hiccups, results are beginning to roll in.
I have acquired a digital elevation model (DEM) for an area containing the Steele and Walsh Glaciers. The DEM appears in both maps as a gray-scale patch with higher elevations depicted with brighter pixels. In the zoomed map, the Steele and Walsh Glaciers are denoted with red and green curves, respectively, overlaid on the DEM.
I have identified 60 granules in which Steele Glacier, Walsh Glacier, or both are visible. The granules are from both Sentinel-1A and Sentinel-1B in the time range from December 2014 to March 2017. This preliminary data set mostly contains granules acquired while ascending, but some granules were acquired while descending.
This project will use time series of Sentinel-1 SAR images over Steele and Walsh glaciers, Yukon Canada, to estimate their ice velocity with their variation in time. Ice motion tracking is done using Speckle tracking procedures embedded in the GAMMA Remote Sensing Software Tools.
Student Leading the Project:
Kenneth Arnoult, University of Alaska Fairbanks