Measuring the 3-D Flow of the Lowell Glacier with InSAR

| In this paper, we use single and dualpass satellite-based interferometric radar to measure the ow magnitude of a large alpine glacier. Since the radar measurements alone are not su cient to resolve the 3-D ow direction of the glacier, several ow directions assumptions are made, and checked for mutual consistency. The assumptions that the horizontal component of ow is parallel to the medial moraine, and that the ow is parallel to the glacier surface give the best results over most of the glacier. With one or both of these assumptions, we are able to measure the glacier ow along its centreline to an accuracy of approximately 3 cm/day.