More than one hundred glaciers are presently covering an area of 53 km2 in the Adamello-Presanella Group. Glacier variations that occurred in the XX Century have been identified on the basis of historical maps, aerial photographs, geomorphological and glacial geological field surveys, and reconstructed on the basis of direct and indirect measurements. Glaciers limits deduced from cartographic and photographic documents have been processed and managed using a GIS. Both documents have been georeferenced (photographic documents using a Direct Linear Transformation to correct tilting and relief displacement). Glaciers limits have been digitized (as vector files) directly on georeferenced documents (raster files). All data have been transformed in Gauss-Boaga projection and positioned on Technical Regional Maps at the scale of 1:10,000. Since the middle of the XIX Century, there has been a notable reduction in thickness and extension of glacier bodies, broken by brief and weak advances. The marked regression of the fronts has caused withdrawals ranging from several hundreds metres to more than 2000 m (Vedretta della Lobbia). Since the Little Ice Age until 1990 AD, about 90 glaciers disappeared and glacier surfaces reduced of about 46 km2 (47% respect to their maximum Holocene extension).
Recent glacier variations in the Adamello-Presanella Group (Central Alps, Italy)
BARONI, CARLO;SALVATORE, MARIA CRISTINA
2005-01-01
Abstract
More than one hundred glaciers are presently covering an area of 53 km2 in the Adamello-Presanella Group. Glacier variations that occurred in the XX Century have been identified on the basis of historical maps, aerial photographs, geomorphological and glacial geological field surveys, and reconstructed on the basis of direct and indirect measurements. Glaciers limits deduced from cartographic and photographic documents have been processed and managed using a GIS. Both documents have been georeferenced (photographic documents using a Direct Linear Transformation to correct tilting and relief displacement). Glaciers limits have been digitized (as vector files) directly on georeferenced documents (raster files). All data have been transformed in Gauss-Boaga projection and positioned on Technical Regional Maps at the scale of 1:10,000. Since the middle of the XIX Century, there has been a notable reduction in thickness and extension of glacier bodies, broken by brief and weak advances. The marked regression of the fronts has caused withdrawals ranging from several hundreds metres to more than 2000 m (Vedretta della Lobbia). Since the Little Ice Age until 1990 AD, about 90 glaciers disappeared and glacier surfaces reduced of about 46 km2 (47% respect to their maximum Holocene extension).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
