Run: Lambert conformal grid

The COPYGB grid definition parameters for Lambert Conformal grids are listed below:

copygb -g"255 3 NX NY STARTLAT STARTLON 8 CENLON DX DY POLE 64 TRUELAT1 TRUELAT2" -x in.grb out.grb

where
	255 3	User-defined Lambert Conformal grid
	NX	Number of points on latitude circle
	NY	Number of points on longitude meridian
	STARTLAT	Southwest corner latitude * 1000 (lat = -90 ... 90)
	STARTLON	Southwest corner longitude * 1000 (lon = -180 ... 180)
	8
	CENLON	Center longitude * 1000
	DX	Longitudinal increment in meters
	DY	Latitudinal increment in meters
	POLE	Northern (0) or southern (128) hemisphere
	64
	TRUELAT1	First true latitude * 1000
	TRUELAT2	Second true latitude * 1000

Please note that all of the grid definition parameters must be integers. All latitude and longitude values are given in thousandths of a degree. The grid increments are given in meters.

User-Defined Lambert Conformal Grid

Rather than defining a Lambert Conformal manually, we'll use the output of wgrib to define the grid we'd like to use. Let's look again at the wgrib output for NCEP grid 212:

Here is the grid definition:

Lambert Conf: Lat1 12.190000 Lon1 -133.459000 Lov -95.000000
Latin1 25.000000 Latin2 25.000000 LatSP 0.000000 LonSP 0.000000
North Pole (185 x 129) Dx 40.635000 Dy 40.635000 scan 64 mode 8

Translate this definition to the COPYGB grid specification as follows:

• NX = 185
• NY = 129
• STARTLAT = 12190
• STARTLON = -133459
• CENLON = -95000
• DX = 40635
• DY = 40635
• TRUELAT1 = 25000
• TRUELAT2 = 25000

Plug these numbers into the grid specification and run COPYGB follows:

Lastly, run wgrib on the COPYGB output and make sure the grid matches the one listed above: