Description :
Like the surface characteristics, the internal structure of ice roads varies constantly due to traffic activity and maintenance practices such as flooding. The cracks visible here represent dielectric discontinuities that influence the interaction of the ice cover with incident radar waves and thus affect its appearance in RADARSAT-2 images.
Photographe :
van der Sanden, J
J
Collection :
Ressources naturelles Canada
Haute-résolution :
5.9 MB
3696x2448 pixels
300 ppi (jpeg)
Nota :
Depending on the weather conditions, ice cover can grow the full extent of the available water depth and become attached to the lake bottom. Unfortunately, bottom-fast ice cannot be discriminated from floating columnar ice in individual RADARSAT-2 multi-polarization composite images because both ice types display black. Discrimination of the two ice types is facilitated by a times series of RADARSAT-2. The measured backscatter level decreases
when the ice becomes bottom-fast and increases when the ice grows. Similar to shorelines, bottom-fast ice formations jeopardize the trafficability of ice roads because their presence increases the risk of traffic induced ice cover failures. However, the presence of bottom-fast ice is more difficult to ascertain.
Géographie :
6045; Tibbitt-to-Contwoyto Winter Road; Territoires du Nord-Ouest; 2020-339.JPG; Nunavut