The delineation of ice-margin and lake extent is assumed to be accurate to within ±1 pixel (30 m) of the true ice-margin/lake perimeter. Given the regional aggregation of measurements, it is assumed that any over-estimation of the ice-margin position is cancelled out by an equal and opposite under-estimation, and uncertainty in the ice-margin positions is therefore not specifically assessed for these bulk figures. In addition, the absolute error associated with each lake area measurement was dependent on lake size and planform, and thus resulted in a declining power law relationship whereby the greatest errors were associated with the smallest lakes. For example, lakes measuring 0.5 km2 had an area uncertainty of ~9 %, whilst lakes measuring > 5 km2 had an uncertainty of < 3 %.

Rates of change at lacustrine margins were only generated when a lake was present in two or more successive epochs.

Measurements of ice-margin change between 1987 and 1992 at the southernmost latitudes of the survey area are absent due to the unavailability of Landsat TM scenes for this region in the years 1985-1988.