Volume IV-2/W4
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2/W4, 493-497, 2017
https://doi.org/10.5194/isprs-annals-IV-2-W4-493-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2/W4, 493-497, 2017
https://doi.org/10.5194/isprs-annals-IV-2-W4-493-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  14 Sep 2017

14 Sep 2017

ESTIMATION OF SHIE GLACIER SURFACE MOVEMENT USING OFFSET TRACKING TECHNIQUE WITH COSMO-SKYMED IMAGES

Q. Wang1, W. Zhou1, J. Fan2, W. Yuan2, H. Li3, J. J. Sousa4, and Z. Guo2 Q. Wang et al.
  • 1School of Land Science and Technology, China University of Geosciences, Beijing 100083, China
  • 2China Aero Geophysical Survey and Remote Sensing Centre for Land and Resources, Beijing 100083, China
  • 3Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China
  • 4University of Trás-os-Montes e Alto Douro, Vila Real, and INESC TEC (formerly INESC Porto), Portugal

Keywords: Synthetic Aperture Radar, Shie glacier, Offset tracking technique, Glacier surface movement, COSMO-SkyMed

Abstract. Movement is one of the most important characteristics of glaciers which can cause serious natural disasters. For this reason, monitoring this massive blocks is a crucial task. Synthetic Aperture Radar (SAR) can operate all day in any weather conditions and the images acquired by SAR contain intensity and phase information, which are irreplaceable advantages in monitoring the surface movement of glaciers. Moreover, a variety of techniques like DInSAR and offset tracking, based on the information of SAR images, could be applied to measure the movement. Sangwang lake, a glacial lake in the Himalayas, has great potentially danger of outburst. Shie glacier is situated at the upstream of the Sangwang lake. Hence, it is significant to monitor Shie glacier surface movement to assess the risk of outburst. In this paper, 6 high resolution COSMO-SkyMed images spanning from August to December, 2016 are applied with offset tracking technique to estimate the surface movement of Shie glacier. The maximum velocity of Shie glacier surface movement is 51 cm/d, which was observed at the end of glacier tongue, and the velocity is correlated with the change of elevation. Moreover, the glacier surface movement in summer is faster than in winter and the velocity decreases as the local temperature decreases. Based on the above conclusions, the glacier may break off at the end of tongue in the near future. The movement results extracted in this paper also illustrate the advantages of high resolution SAR images in monitoring the surface movement of small glaciers.