and thinning during the
20th century. The radio-echo sounding (RES)
line network and sites
of RES point survey is shown in (E). The red
line is the 2001 ice
divide for Hoffellsjökull (212 km2).
The most accurate glacier DEM is created from the air-
borne LiDAR survey conducted in the autumn of 2010
(
5×
5 m pixel resolution, with an accuracy of <20 cm in el-
evation and <0.5 m in position, Fig. 3). It is used
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