On receipt of the new DSM (digital surface model) from IfSAR missions at 5-meter pixel resolution, it became possible to more accurately trace the boundaries of glaciers. Previous glacier layers have included a great deal of perennial snow cover, exaggerating the true extent of glacial ice. This map represents several days of manual tracing, following the abrupt edges where fairly level ice surface meets enclosing bedrock walls. On the IfSAR ‘bare-earth’ layer, surface texture of glaciers is often smoother than that of enclosing alpine topography. For adjacent BC and Yukon, I used a coarser elevation model at 30-m pixel.
2018 | Richard Carstensen | 1 page