Evaluación de las Diferencias Entre Datos de Precipitación del IDEAM y Sensores Satelitales en la Cuenca Media del Río Lebrija, Colombia

Abstract

Hydro-climatological studies in different basins require databases of climatic variables. IDEAM is the main entity monitoring these variables in Colombia, providing official, free, and accessible data. There are also other local and international entities that offer information from remote sensing satellite sensors. Climatological station data sometimes presents uncertainties due to external factors, and its distribution is limited in certain areas. To address this issue, the present research was developed in the middle basin of the Lebrija River, using three sources of information to compare the samples. Precipitation data from 25 IDEAM stations was collected, of which 6 were used, and compared with data from satellite sensors obtained from The POWER Data Access Viewer and Giovanni portals of EARTH DATA. The information was reviewed, refined, and completed. What is more, statistical analyses of trends, variability, correlations, cross-validation, significance tests, and probability analysis were applied. The results show that, in areas without stations, sensors provide continuous data; however, when compared to IDEAM data, the correlations are low in most cases. This suggests that although satellite products are useful in areas without coverage, station data still shows greater coherence and better statistical fit, making it the primary source when available.