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read_icgem_gfc
Read spherical harmonic coefficients from an ICGEM GFC ascii-formatted file.
This function only reads files with the gravity field spherical harmonic coefficients.
Usage
cilm
, gm
, r0
, [errors
] = read_icgem_gfc (filename
, [errors
, lmax
, epoch
])
Returns
cilm
: array- Array with the coefficients with the shape (2,
lmax
+ 1,lmax
+ 1) for the given epoch. gm
: float- Standard gravitational constant of the model, in m3/s2.
r0
: float- Reference radius of the model, in meters.
errors
: array, optional- Array with the errors of the coefficients with the shape (2,
lmax
+ 1,lmax
+ 1) for the given epoch.
Parameters
filename
: str- The ascii-formatted filename containing the spherical harmonic coefficients.
errors
: str, optional- Which errors to read. Can be either "calibrated", "formal" oNone. Default is None.
lmax
: int, optional- Maximum degree to read from the file. If lmax is None, less than 0, or greater than lmax_model, the maximum degree of the model will be used.
epoch
: str or float, optional- The epoch time to calculate time-variable coefficients in YYYYMMDD.DD format. If None then reference epoch t0 of the model will be used. If format of the file is 'icgem2.0' then epoch must be specified.
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