Relación entre índices de sequía usando datos meteorológicos y satelitales, en la estepa magallánica seca (Patagonia)

The effects of drought have an impact on the productive sector in different regions, affecting vegetation, water availability and the consequences that this causes, so it is of interest to study its behavior in order to be able to carry out monitoring and early warnings. There are different proposed indices in the literature, some of which are obtained from meteorological data, and others from satellite images. The objective of the present work is to relate drought indices obtained with data from meteorological stations (Anomaly of Precipitation - AP, the Standardized Precipitation Index -SPI, the Standardized Precipitation and Evapotranspiration Index - SPEI), MODIS-Moderate Resolution Imaging Spectroradiometer remote sensing indices (Normalized Drought Index- NDDI, Normalized Water Index- NDWI, Normalized Vegetation Index- NDVI, Enhanced Vegetation Index- EVI) and anomalies of the latter for the Dry Magellanic Steppe ecological area, considering the period 2000 - 2019. The results show that the SPI calculated at the 12-month scale correlates moderately with the NDWI anomaly, although both, like the NDDI, allow the detection of drought events in the period considered.