THE NCEP ETA MODEL HORIZONTAL OUTPUT GRID FOR GCIP/GIST
The chosen GCIP/GIST horizontal output grid from the
mesoscale NCEP Eta Model is NCEP Grid No. 212, known as
AWIPS Grid 212. This grid is defined on a Lambert
Conformal projection with a nominal horizontal grid
resolution of 40-km and grid dimensions of 185 x 129.
The latitude/longitude locations of the corner points
of this grid are given below:
( I , J ) Latitude / Longitude
( 1 , 1 ) 12.190 N / 133.459 W
( 1 ,129) 54.536 N / 152.856 W
(185,129) 57.290 N / 49.385 W
(185, 1 ) 14.335 N / 65.091 W
The above domain covers most of N. America and the nearby
oceans, including the 48 contiguous U.S. states, the southern
half of Canada, and most of Mexico.
The latitude and longitude values for the entire 185 x 129
grid have been provided in two companion files; one file
written as a packed binary file and one file written as
a formatted ascii file. These files are decribed below:
File lalog212.fmt :
Written as ascii formatted records (total records = 23865,
i.e. 185 x 129). Each record contains the following
information: I index value, J index value, latitude(I,J) (+N),
longitude(I,J) (deg E), written with this FORMAT statement:
(2I4,1X,F12.5,1X,F12.5)
File lalog212.grb :
Written as an unblocked packed binary file using the
WMO international "GRIB" packing convention. Two arrays
written:
1) the latitudes of the 185 x 129 grid (+N) and
2) the longitudes of the 185 x 129 grid (deg E)