Operations began in early 1979 and the program continued through 1990 with funding from various agencies. Annual reports on this data were published from 1979 to 1992. LD is the day of the month. LAT is the latitude in degrees north. LONG is the longitude in degrees east.
P is the interpolated pressure in millibars.
EP is the interpolation error variance in millibars squared. ET is the interpolation error variance in degrees Celsius squared. PX, PY are the pressure derivatives times 103 in the x and y direction. PX and PY are in units of millibars per 103 kilometers. PXX, PXY, PYY are the interpolated second derivatives of pressure times 106.