File parameters for Alaska permafrost classes.

Map:
  Projection                       Albers Equal-Area Conic
  First standard parallel          55 00 00 N
  Second standard parallel         65 00 00 N
  Longitude of central meridian    154 00 00 W
  Latitude of origin               50 00 00 N
  False easting                    0
  False northing                   0
  Spheroid parameters:              Clarke 1866
  Units of measure                 Meters
  Cell size                        1,000 meters

Center of pixel (1,1)              ( -997000, 2422000)
  Number of lines                  1,992 
  Number of samples                2,512
  Header file                      None
  Header record                    None
  Data depth                       Byte (8 bits)
  Number of channels               1

Albers meters for minimum bounding rectangle (X, Y):  
  Upper Left             (-977500  2422500)
  Upper Right            (1534500  2422500)
  Lower Left             (-977500   430500)
  Lower Right            (1534500   430500)

Geographic degrees, minutes, and seconds:
  Upper Left        (179 51' 52" W   70  4' 39" N)
  Upper Right       (115 59' 22" W   67 41' 51" N)
  Lower Left        (168 36'  9" E   52 55'  0" N)
  Lower Right       (131 35' 27" W   51 31' 53" N)

Cell Values and Permafrost Class Description:
  0 Null - Fill
  2 Mountainous Area underlain by continuous permafrost
  3 Mountainous Area underlain by discontinuous permafrost
  4 Mountainous Area underlain by isolated masses of permafrost
  5 Lowland & Upland Area underlain by thick permafrost
  6 Lowland & Upland Area underlain by moderately thick to thin permafrost
  7 Lowland & Upland Area underlain by discontinuous permafrost
  8 Lowland & Upland Area underlain by numerous isolated masses of permafrost
  9 Lowland & Upland Area underlain by isolated masses of permafrost
 10 Lowland & Upland Area underlain by generally free of permafrost
 11 Areas outside of permafrost region generally free of permafrost

Reference:
Ferrians, O.J., 1965. Permafrost map of Alaska. U.S. Geological 
Survey Miscellaneous Geologic Investigations Map 1-445.