icesat function: plots the hydrostatic line, landward limit of ice flexure, and the break-in-slope associated with flexure, as described here: http://nsidc.org/data/docs/agdc/nsidc0469_brunt/index.html.
reftrack function: gives coordinates of ICESat ground tracks or reference tracks.
These functions require Antarctic Mapping Tools.
Added reftrack function.
Adapted into a plugin for Antarctic Mapping Tools.
Inspired: Bamber et al. Antarctic DEM, Antarctic Active Subglacial Lake Inventory from ICESat Altimetry, Ice shelf tidal flexure interpolator, RAMP Radarsat Antarctic Mapping Project, MEaSUREs, Antarctic Drainage Basins
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