Note:

Terrain elevations in RUC changed several times:

2003 - 2004: ruc20.dat

2005: Three terrain elevation for 2005 RUC grib files
 a. For periods before 2005062812: ruc20.dat
 b. 2005062812 - 2005101813:       ruc20_2.dat
 c. 2005101814 - 2005112219:       ruc20_3.dat
 d. For periods after 2005101820:  ruc20_2.dat

2006: Two terrain elevation for 2006 RUC grib files
 a: 2006010100 - 2006071113: Same as b/d in 2005 (ruc20_2.dat)
 b: 2006071114 - 2007010123: Same as c in 2005   (ruc20_3.dat)

2007: One terrain elevation
 Up to now: Same as b in 2006 (ruc20_3.dat)

2008: Two terrain elevation
 a: 2008010100 - 2008061117: Same as b in 2006 (ruc20_3.dat)
 b: 2008061118 - 2009010123: ruc20_4.dat

2009: One terrain elevation
 a: 2009010100 - 2009010123: ruc20_4.dat (Same as 2008 b)

Zhong Wu
10/14/2009
 

