Our analysis of lake level and storage variability observed by ICESat-2 uses a modified version of the Global Surface Water Occurrence (GSWO) product to identify lakes … When we originally calculated the area of lakes derived from this product, we assumed a grid cell resolution of 30 m, the native resolution of the Landsat imagery used to develop the GSWO product. However, the GSWO product is actually post-processed to a grid cell resolution of 0.00025° × 0.00025°. Since the Earth is an oblate spheroid, the length (in meters) of both a degree of latitude and a degree of longitude vary with latitude.