Glacier Image Velocimetry: an open-source toolbox for easy and rapid calculation of high-resolution glacier velocity fields

Abstract. We present Glacier Image Velocimetry (GIV), an open-source and easy-to-use software toolkit for rapidly calculating high-spatial-resolution glacier velocity fields. ice fields reveal flow dynamics, ice-flux changes, (with additional data modelling) thickness. Obtaining measurements over wide areas with field techniques is labour intensive often associated safety risks. The recent increased availability of high-resolution, short-repeat-time optical imagery allows us to obtain displacement using “feature tracking” based on matching persistent irregularities the surface between images hence, time. GIV fully parallelized automatically detects, filters, extracts velocities from large datasets images. Through this coupled toolchain GUI, can analyse hundreds thousands image pairs a laptop or desktop computer. four example applications in which we complement glaciology campaign (Glaciar Perito Moreno, Argentina) calculate small mid-latitude (Glacier d'Argentière, France) tropical glaciers (Volcán Chimborazo, Ecuador), as well very (Vavilov Ice Cap, Russia). Fully commented MATLAB code stand-alone app are available GitHub Zenodo (see https://doi.org/10.5281/zenodo.4624831, Van Wyk de Vries, 2021a).