| Title | Determination of glacier retreat at Nevado del Ruiz, Santa Isabel and Tolima volcanoes, Colombia through optical image and Din-SAR / Estimación del retroceso glaciar en los volcanes Nevado del Ruiz, Tolima
y Santa Isabel, Colombia a través de imágenes ópticas y Din-SAR |
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| Author | Monterroso-Tobar, M F; Londoño-Bonilla, J M; Samsonov, S |
| Source | DYNA (Revista de la Facultad Nacional de Minas, Universidad Nacional de Colombia) 85, 206, 2018 p. 329-337, https://doi.org/10.15446/dyna.v85n206.66570  Open
Access |
| Image |  |
| Year | 2018 |
| Alt Series | Natural Resources Canada, Contribution Series 20180423 |
| Publisher | Universidad Nacional de Colombia |
| Document | serial |
| Lang. | English; Spanish |
| Media | paper; on-line; digital |
| File format | pdf (Adobe® Reader®); xml |
| Area | Parque Nacional Natural de Los Nevados; Nevado del Ruiz Volcano; Nevado de Santa Isabel Volcano; Nevado del Tolima Volcano; Colombia |
| Lat/Long WENS | -75.5833 -75.1667 5.0000 4.5833 |
| Subjects | environmental geology; hydrogeology; geophysics; glaciers; ice sheets; ice retreat; ice margins; tectonic setting; volcanoes; volcanic ash; remote sensing; satellite imagery; radar methods; spectral
analyses; Classification; Ice caps |
| Illustrations | tables; location maps; geoscientific sketch maps; satellite images; bar graphs |
| Program | Remote Sensing Science |
| Released | 2018 09 01 |
| Abstract | We performed a quantification of glacier retreat of Nevado del Ruiz Volcano (VNR), Nevado de Santa Isabel Volcano (VNSI) and Nevado del Tolima Volcano (VNT), using satellite images Landsat 8 OLI TIRS
and coherence images obtained by DinSAR technique of Radarsat II images. Spectral indexes and supervised image classification were calculated to differentiate the ice boundary. Between 2010 and 2015 the ice sheet of the volcanoes under study has
retreated 24%, 42% and 60% respectively. The coherence images show similar results as those obtained by optical images. The use of coherence images can be used for the delimitation of ice and rock in glacial areas. The ash on the ice sheet is a
particular phenomenon on the VNR ice cap, which complicates the delimitation of the glacier surface for that volcano. |
| GEOSCAN ID | 313771 |
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