Abstract

MATIZ-LEON, Jhon Camilo; RODRIGUEZ-RODRIGUEZ, Gilbert Fabián  and  ALFARO-VALERO, Claudia María. Soil Temperature Models via Surface Temperature Surveys and Remote Sensors for the Geothermal Area of the Azufral Volcano. Cienc. Ing. Neogranad. [online]. 2019, vol.29, n.1, pp.19-35. ISSN 0124-8170.  https://doi.org/10.18359/rcin.3400.

Heat distribution estimates at the surface and shallow depths (20 cm, 100 cm, and 150cm) obtained through surface temperature surveys (STSs) in the geothermal area of the Azufral volcano found anomalies ranging between 6 °C and 20 °C. Additionally, temperature models developed through Landsat 8 images from the thermal infrared sensor (TIRS) reached an approximation of the surface heat distribution based on three images captured around the dates on which the STSs were conducted. Aggregating the normalized difference vegetation index (NDVI) (between 0.93 and -0.563) and the topography (elevations between 2800 and 3800 m above sea level) in cross-sections using spatial analysis techniques, this study assessed the positive and negative anomalies exhibited by these three variables within the geothermal area. Further, using Pearson coefficient estimates as a quantitative method for analyzing the correlations between the different models generated, a strong positive correlation (between 0.19 and 0.46) is denoted between deep temperatures against the different surface temperatures calculated for each day using Landsat 8 TIRS.

Keywords : Geothermal Exploration; Azufral Volcano; Surface Temperature Surveys; Remote Sensing; NDVI; Digital Processing of Satellite Images.

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