Winter accumulation and summer ablation balance maps are constructed annually for each glacier using large scale digital elevation models for each glacier. (nichols.edu)
Willis, Michael J. «Construction of High Resolution Digital Elevation Model Time - Series in Support of GIA modelling: A Multi-Layered Cake - A Recipe for Success.» (polenet.org)
Landsat satellite images were purchased from the US Geologic Survey (USGS), and 1:100,000 scale digital elevation models of pre-1976 terrain were also provided by the USGS. (ilovemountains.org)