Pixel-wise elevation differences with a spatial resolution of 2m, derived from ArctciDEM by:
"the most recent elevation - the oldest elevation".

grid_ids_DEM_diff_grid23017.tif: the elevation differences. The pixel value/ 100.0 is the difference (unit:  meters).
grid_ids_date_diff_grid23017.tif: pixel-wise differences of acquisition dates between the most recent elevation and the oldest elevation.
grid_ids_date_diff_grid23017.txt: the indices and ArcticDEM files for producing the elevation differences, we can tell the acquisition dates from the file names.
grid_ids_date_diff_grid23017_newIndex.tif: the index of the most recent ArcticDEM file at each pixel (grid_ids_date_diff_grid23017.txt).
grid_ids_date_diff_grid23017_oldIndex.tif: the index of the oldest ArcticDEM file at each pixel (grid_ids_date_diff_grid23017.txt).