Balance de masa geodésico del glaciar de cráter del complejo volcánico Sollipulli entre 1998 y 2007 mediante reanálisis de datos fotogramétricos.
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Date
2026
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Universidad de Concepción
Abstract
Esta investigación evalúa el balance de masa geodésico del glaciar de cráter del complejo volcánico Sollipulli durante el período 1998–2007, mediante el reanálisis de fotografías aéreas históricas, Modelos Digitales de Elevación (MDE), imágenes Landsat y datos SRTM. Durante el procesamiento se delimitaron tanto el glaciar de cráter como glaciaretes periféricos; sin embargo, el cálculo final del balance de masa se restringe exclusivamente al glaciar de cráter, con el fin de mantener una unidad espacial coherente. Los MDE de 1998 y 2007 fueron generados mediante fotogrametría aérea en Catalyst Professional, reproyectados a UTM zona 19S, remuestreados a 30 m y corregidos verticalmente usando el SRTM 2000 como referencia en terreno estable. El MDE de 1979 fue evaluado, pero descartado por su elevada incertidumbre residual. Los resultados indican que el área del glaciar de cráter disminuyó desde 13,67 km² en 1998 a 11,66 km² en 2007, equivalente a una pérdida de 2,01 km² (-14,7%). El cambio medio de elevación fue de -21,74 m, con una desviación estándar de ±10,03 m y un RMSE local en terreno rocoso de ±9,70 m. A partir de una densidad de conversión de 850 kg/m³, se estimó una tasa anual de balance de masa de -2,05 m w.e./año.
This thesis evaluates the geodetic mass balance of the crater glacier of the Sollipulli volcanic complex for the 1998–2007 period using historical aerial photographs, Digital Elevation Models (DEM), Landsat imagery and SRTM data. Although both the crater glacier and peripheral glacierets were mapped during processing, the final mass-balance calculation is restricted to the crater glacier only. The DEMs for 1998 and 2007 were generated through aerial photogrammetry in Catalyst Professional, reprojected to UTM zone 19S, resampled to 30 m, and vertically corrected using the SRTM 2000 as a stable-terrain reference. The 1979 DEM was evaluated but discarded due to its high residual uncertainty. The results indicate that the crater glacier area decreased from 13.67 km² in 1998 to 11.66 km² in 2007, representing a loss of 2.01 km² (-14.7%). The mean elevation change was -21.74 m, with a standard deviation of ±10.03 m and a local RMSE over stable rock terrain of ±9.70 m. Using a density conversion factor of 850 kg/m³, the annual geodetic mass-balance rate was estimated at -2.05 m w.e./yr.
This thesis evaluates the geodetic mass balance of the crater glacier of the Sollipulli volcanic complex for the 1998–2007 period using historical aerial photographs, Digital Elevation Models (DEM), Landsat imagery and SRTM data. Although both the crater glacier and peripheral glacierets were mapped during processing, the final mass-balance calculation is restricted to the crater glacier only. The DEMs for 1998 and 2007 were generated through aerial photogrammetry in Catalyst Professional, reprojected to UTM zone 19S, resampled to 30 m, and vertically corrected using the SRTM 2000 as a stable-terrain reference. The 1979 DEM was evaluated but discarded due to its high residual uncertainty. The results indicate that the crater glacier area decreased from 13.67 km² in 1998 to 11.66 km² in 2007, representing a loss of 2.01 km² (-14.7%). The mean elevation change was -21.74 m, with a standard deviation of ±10.03 m and a local RMSE over stable rock terrain of ±9.70 m. Using a density conversion factor of 850 kg/m³, the annual geodetic mass-balance rate was estimated at -2.05 m w.e./yr.
Description
Tesis presentada para optar al título de Geógrafo/a.
Keywords
Glaciares, Volcanes, Fotogrametría