id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
228	Inconsistent precision in MSIS_coeff.nc file	Ian Culverwell	Ian Culverwell	"Kjartan Kinch (DMI) discovered that these coefficients are being held at different precision in OCC (8 decimal places, from ascii file) and ROPP (read in from ascii file as single precision, then promoted to double precision before being written out as DP vars to netCDF file).  

By reading them in as DP variables in ropp_pp/msis_bangle/MSIS_ascii2netcdf.pro we obtain a netcdf file at equivalent precision. For example:

ba_Ac0(1, 1, 1) from '''ascii''' ropp_pp/data/dabcs01.asc = 
  0.32796969E+02

ba_Ac0(1, 1, 1) from '''original''' ropp_pp/data/MSIS_coeff.nc = 
   3.27969703674316406250e+01

ba_Ac0(1, 1, 1) from '''revised''' ropp_pp/data/MSIS_coeff.nc = 
   3.27969689999999971519e+01

Unfortunately, it doesn't fix the original problem, but at least it's one less known difference between OCC and ROPP.  

This change will be introduced at ROPP5.0. "	defect	closed	normal	5.0	ropp_pp	4.1	fixed	MSIS