Inferring volumetric changes at a shallow lake from subpixel satellite-derived shorelines

•Satellite-Derived Shorelines at Gallocanta Lake from mid-resolution satellite imagery.•SDS with subpixel accuracy leads to an accurate definition of the lake's perimeter.•A large package of SDS to define the three-dimensionality of the shore (1984–2020).•Volume is estimated by modeling the relationship between water surface and elevation.•Efficient RS approach for monitoring water bodies through large periods of time.