SnapEarth at the EGU Assembly conference

22 April 2021

One of the SnapEarth project pilots - EarthFoodSecurity will be presented at the EGU Assembly.

Representatives from isardSAT on Tuesday 27th April (session HS6.2 - Remote sensing of soil moisture) during this virtual event will present High-resolution root zone soil moisture-based indices for drought monitoring in the Ebro basin.

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More information about the event:

Below we present the abstract of the presentation:
A recursive formulation of an exponential filter was used in order to derive 1 km resolution RZSM estimates from SMOS (Soil Moisture Ocean Salinity) surface soil moisture (SSM) over the Ebro basin. The daily 1 km RZSM estimates were then used to derive 1 km drought indices such as soil moisture anomalies and soil moisture deficit indices (SMDI), on a weekly time-scale, covering the entire 2020 year. Results show that both drought indices are able to capture rainfall and drying events, with the weekly anomaly being more responsive to sudden events such as heavy rainfalls, while the SMDI is slower to react do the inherent inertia it has. Moreover, a quantitative comparison with drought indices derived from a model-based RZSM estimates has also been performed, with results showing a strong correspondence between the different indices. The analysis shows that the anomalies and SMDI based on the RZSM are more representative of the hydric stress level of the plants than the same indices based on SSM, given that the RZSM is better suited than the SSM to describe the moisture conditions at the deeper layers, which are the ones used by plants during growth and development.

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