Research on the DEM-assisted offset tracking technique applied to glaciers movement monitoring

doi:10.6046/gtzyyg.2018.03.23

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Abstract

To improve the offset results influenced by large spatial baseline and topography when traditional offset tracking technique is applied to extracting mountain glaciers surface movement, the authors studied a DEM-assisted offset tracking technique. Two pairs of TerraSAR-X images with different baseline lengths which cover the eastern section of Chomo Lhari Mountains located in Kangmar and Nagarze County of Tibet were selected to test the traditional and external DEM-assisted offset tracking techniques in this paper. And the offset results of the two methods in ice-free region were comparatively studied. A pair of COSMO-SkyMed images acquired by different beam modes, with different incidences and covers, were selected and processed with DEM-assisted offset tracking technique. It is shown that the DEM-assisted offset tracking technique could obtain more reliable offset results than the traditional technique where the terrain is steep and the spatial baseline is large. The technique can also apply to SAR images which have different beam modes and can make more SAR data useful for glaciers surface movement monitoring.

Keywords offset tracking technique glaciers surface movement large spatial baseline topographic effect external DEM TerraSAR-X COSMO-SkyMed

TP79

Corresponding Authors: Jinghui FAN E-mail: jhfan2004@qq.com

Issue Date: 10 September 2018

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	Qun WANG
	Jinghui FAN
	Wei ZHOU
	Weilin YUAN
	Liqiang TONG
	Zhaocheng GUO

Cite this article:

Qun WANG,Jinghui FAN,Wei ZHOU, et al. Research on the DEM-assisted offset tracking technique applied to glaciers movement monitoring[J]. Remote Sensing for Land & Resources, 2018, 30(3): 167-173.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2018.03.23 OR https://www.gtzyyg.com/EN/Y2018/V30/I3/167

Fig.1 Flow chart of the external DEM-assisted offset tracking technique

Tab.1 Parameters of TerraSAR-X data

Tab.2 Parameters of COSMO-SkyMed data

Fig.2 Study area and TerraSAR-X covering map and the covering map of different incidence COSMO-SkyMed data

Tab.3 RMSE in ice-free region of Traditional and external DEM-assisted offset tracking techniques using TerraSAR-X data(m)

Fig.3 Offset tracking results from image pair 20160625-20160706

Fig.4 Offset tracking results from image pair 20160808-20160819

Fig.5 Offset tracking results from image pair 20160630-20160731

Tab.4 RMSE in ice-free region of external DEM-assisted offset tracking techniques using different incidence COSMO-SkyMed data(m)

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