--- Sea Ice Concentration ---

  Daily analyses of sea ice concentration in the north-east Asian marginal 
seas are provided by Japan Meteorological Agency.

  Our analyses cover the area that is enclosed with two longitudinal lines 
115.0E, 165.0E, and two latitudinal lines 65.0N, 35.0N, with analysis points 
located at an interval of 0.05 degree in both directions, which aggregates 
to 1001x601 grid points. Conditions at the grid points are represented by 
an integer value, notations of which are

<Value>   <Notation>
   0      sea ice concentration       0 / 10 (open water)
   2      sea ice concentration 1 to  3 / 10
   3      sea ice concentration 4 to  6 / 10
   4      sea ice concentration 7 to  8 / 10
   5      sea ice concentration 9 to 10 / 10
   7      no analysis or cloudy area
   9      land

and stored in the ASCII format.
  Every file begins with the 28 bytes-long header line which informs the date 
of analysis, followed by data body which comprises of 1001 columns and 601 
lines. 

--- Sea Ice Condition Chart ---

 Japan Meteorological Agency issues "sea ice information" on every Tuesday 
and Friday from December through May, which includes the statement of 
sea ice analysis and forecast in a week and the chart of sea ice condition 
with its concentration in the Sea of Okhotsk, the northern Sea of Japan and 
the Bohai Sea. "Sea ice condition chart" image is a part of "sea ice 
information" and colored in the sea ice extent by every concentration. This 
image is updated when sea ice information is issued.