Supplemental Codes

The supplemental codes are used in the DESCSUP.CODE record field. The code specifies the the interpretation of the supplemental information for the dimension descriptors. Note that this information is centrally defined rather than locally defined because it may be necessary in order to use the dimensions (e.g., the map projection parameters are needed if the dimensions are map coordinates).

There are currently four supplemental codes defined:

Code 1

specifies the map projection parameters: the radius factor (R), the map scaling factor ($k_0$), the pole longitude, and the pole latitude.

Code 2

specifies the map projection parameters: R, $k_0$, the pole longitude, and two standard latitudes.

Code 3

specifies the reference surface pressure for meteorological sigma coordinates.

Code 4

specifies the reference troposphere-stratosphere boundary pressure for meteorological sigma coordinates.

Code 5

specifies the calendar type.

0 : Gregorian

100 : Model with 365 days per year

All supplemental values associated with the integer ID codes are floating-point numbers.