![]() It is typically calculated by differencing multi-temporal digital elevation models, usually over several years. We therefore show that UAVs can be a very useful tool to validate the glaciological mass balance, which is usually obtained by strong inter- and extrapolations.Ībstract = "The geodetic mass balance of a glacier corresponds to glacier-wide volume changes, converted to mass changes using density assumptions. The results show that the determined geodetic mass balances match closely with the glaciological mass balance and that it is not particularly sensitive to the density assumptions. A previously calibrated mass balance model is used to correct for difference in acquisition dates. The obtained geodetic mass balance is compared with the glaciological mass balance derived from ablation stakes and snow pits. The presented workflow is applied to two glaciers in the Kyrgyz Tien Shan (Central Asia): Bordu glacier and Sary-Tor glacier. In this study, we show how the annual geodetic mass balance of a small-medium sized glacier can also be derived from Uncrewed Aerial Vehicle (UAV) data. Geodetic mass balances are mainly used to estimate regional ice volume changes and to calibrate and validate mass balance models. ![]() The geodetic mass balance of a glacier corresponds to glacier-wide volume changes, converted to mass changes using density assumptions.
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