Source: Brown, J., O. Ferrians, J. A. Heginbottom, and E. Melnikov (2002) Circum-Arctic Map of Permafrost and Ground-Ice Conditions, Version 2. Boulder, Colorado, USA. NSIDC: National Snow and Ice Data Center. Due to their geographical attributes, northern areas have unique constraints on developing and operating their transport infrastructures. One of … Continue reading Land Covered by Permafrost