Abstract: Study the surface velocity and velocity distribution characteristics of the Purog Kangri Glacier from September to October in 2023. Based on two Sentinel-1 radar satellite images, the pixel offset tracking technique is used to extract surface velocity information of Purog Kangri Glacier Glacier and four typical glaciers and draw a glacier velocity field. The pixel offset tracking technique obtains the horizontal pixel offset of the corresponding pixels in the two SAR images by accurately registering the two images, thereby obtaining glacier surface velocity. The surface velocity and velocity distribution characteristics of Purog Kangri Glacier are analyzed based on the glacier velocity field. The results show that the surface velocity of Purog Kangri Glacier is generally slow, with an average velocity of about 0.05 m/d. The average flow velocity of the four typical glaciers in the northwest, northeast, central and southwest of Purog Kangri Glacier is about 0.20, 0.19, 0.15 and 0.04 m/d, respectively. The study found that the flow velocity characteristics of glaciers with different spatial distribution in Purog Kangri Glacier are also different, mainly manifested as the northeastern typical glacier have a faster flow velocity than the southwestern typical glacier.

Key words: glacier surface velocity, Sentinel-1, pixel offset tracking technology, Purog Kangri Glacier