|This investigation explores the utility of multi-polarized airborne SAR images for geological mapping at the lac Volant site in eastern Québec. |
The discovery of the Voisey's Bay massive sulphide
deposit triggered a considerable interest in the Canadian mining community. In August 1996, a discovery with similar mineralogical associations was made near Lac Volant, 65 km NE of Sept-Îles, Québec. The Lac Volant showing started an unprecedented
exploration rush in the area and geological mapping is now still in progress. Preliminary interpretation of a RADARSAT S6 image led to the acquisition of an airborne quad-polarization C-SAR image for MIR Télédétection Inc.
Our results show that
the use of C-HH, C-VH and C-VV, airborne SAR images provide information on the distribution and orientation of lineaments. Analysis of the individual polarimetric images shows that the C-VH image provides a different enhancement of certain
directions. The difference can be explained by a depolarization of the signal by vegetation combined to a geometrical effect of the topography.
These results are particularly relevant to RADARSAT-2, currently scheduled for 2001, which will have
multiple polarization capability.